{"task_id": "dummy_pie_cpp_0001_sum_even", "source": "dummy_pie_cpp", "split": "oracle_seed", "language": "cpp20", "prompt_template_id": "system_contract_user_problem", "source_code": "#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n;cin>>n;vector<long long>a(n);for(int i=0;i<n;i++)cin>>a[i];long long ans=0;for(int i=0;i<n;i++){for(int j=0;j<=i;j++){if(i==j && a[j]%2==0) ans+=a[j];}}cout<<ans<<\"\\n\";}", "visible_tests": [{"name": "sample_1", "stdin": "5\n1 2 3 4 6\n", "stdout": "12\n"}], "public_checker": {"type": "exact_stdout", "strip_trailing_whitespace": true}, "compile": {"command": "g++ -std=c++20 -O2 -pipe main.cpp -o main", "timeout_sec": 20}, "run": {"timeout_sec": 2, "memory_mb": 512}, "constraints": {"assistant_format": "one_reasoning_block_then_one_cpp_fence", "must_preserve_io": true, "must_compile": true, "must_pass_visible_tests": true, "target": "optimize runtime without changing outputs"}, "metadata": {"problem_id": "dummy_sum_even", "baseline_complexity": "O(n^2) due to redundant nested loop", "expected_better_complexity": "O(n)", "hidden_tests_policy": "not_in_seed", "oracle_acceptance": "full mark only"}, "messages": [{"role": "system", "content": "You are an expert C++20 performance optimizer. Preserve stdin/stdout behavior exactly. Prefer simple, readable algorithmic improvements over micro-optimizations. Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text."}, {"role": "user", "content": "Task: optimize this correct but intentionally inefficient C++20 program. Keep the same input and output behavior.\n\nOriginal program:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n;cin>>n;vector<long long>a(n);for(int i=0;i<n;i++)cin>>a[i];long long ans=0;for(int i=0;i<n;i++){for(int j=0;j<=i;j++){if(i==j && a[j]%2==0) ans+=a[j];}}cout<<ans<<\"\\n\";}\n```\n\nVisible tests:\nsample_1 stdin:\n```text\n5\n1 2 3 4 6\n```\nExpected stdout:\n```text\n12\n```"}], "prompt": "SYSTEM: You are an expert C++20 performance optimizer. Preserve stdin/stdout behavior exactly. Prefer simple, readable algorithmic improvements over micro-optimizations. Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text.\n\nUSER: Task: optimize this correct but intentionally inefficient C++20 program. Keep the same input and output behavior.\n\nOriginal program:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n;cin>>n;vector<long long>a(n);for(int i=0;i<n;i++)cin>>a[i];long long ans=0;for(int i=0;i<n;i++){for(int j=0;j<=i;j++){if(i==j && a[j]%2==0) ans+=a[j];}}cout<<ans<<\"\\n\";}\n```\n\nVisible tests:\nsample_1 stdin:\n```text\n5\n1 2 3 4 6\n```\nExpected stdout:\n```text\n12\n```"}
{"task_id": "dummy_pie_cpp_0002_prefix_queries", "source": "dummy_pie_cpp", "split": "oracle_seed", "language": "cpp20", "prompt_template_id": "user_only_full_instruction", "source_code": "#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,q;cin>>n>>q;vector<long long>a(n+1);for(int i=1;i<=n;i++)cin>>a[i];while(q--){int l,r;cin>>l>>r;long long s=0;for(int i=1;i<=n;i++){if(l<=i && i<=r)s+=a[i];}cout<<s<<\"\\n\";}}", "visible_tests": [{"name": "sample_1", "stdin": "5 3\n2 4 6 8 10\n1 3\n2 5\n4 4\n", "stdout": "12\n28\n8\n"}], "public_checker": {"type": "exact_stdout", "strip_trailing_whitespace": true}, "compile": {"command": "g++ -std=c++20 -O2 -pipe main.cpp -o main", "timeout_sec": 20}, "run": {"timeout_sec": 2, "memory_mb": 512}, "constraints": {"assistant_format": "one_reasoning_block_then_one_cpp_fence", "must_preserve_io": true, "must_compile": true, "must_pass_visible_tests": true, "target": "optimize runtime without changing outputs"}, "metadata": {"problem_id": "dummy_prefix_queries", "baseline_complexity": "O(nq) range sums", "expected_better_complexity": "O(n+q) with prefix sums", "hidden_tests_policy": "not_in_seed", "oracle_acceptance": "full mark only"}, "messages": [{"role": "user", "content": "Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text.\n\nTask: optimize this correct but intentionally inefficient C++20 program. Keep the same input and output behavior.\n\nOriginal program:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,q;cin>>n>>q;vector<long long>a(n+1);for(int i=1;i<=n;i++)cin>>a[i];while(q--){int l,r;cin>>l>>r;long long s=0;for(int i=1;i<=n;i++){if(l<=i && i<=r)s+=a[i];}cout<<s<<\"\\n\";}}\n```\n\nVisible tests:\nsample_1 stdin:\n```text\n5 3\n2 4 6 8 10\n1 3\n2 5\n4 4\n```\nExpected stdout:\n```text\n12\n28\n8\n```"}], "prompt": "USER: Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text.\n\nTask: optimize this correct but intentionally inefficient C++20 program. Keep the same input and output behavior.\n\nOriginal program:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,q;cin>>n>>q;vector<long long>a(n+1);for(int i=1;i<=n;i++)cin>>a[i];while(q--){int l,r;cin>>l>>r;long long s=0;for(int i=1;i<=n;i++){if(l<=i && i<=r)s+=a[i];}cout<<s<<\"\\n\";}}\n```\n\nVisible tests:\nsample_1 stdin:\n```text\n5 3\n2 4 6 8 10\n1 3\n2 5\n4 4\n```\nExpected stdout:\n```text\n12\n28\n8\n```"}
{"task_id": "dummy_pie_cpp_0003_count_pairs", "source": "dummy_pie_cpp", "split": "oracle_seed", "language": "cpp20", "prompt_template_id": "system_role_user_brief", "source_code": "#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,k;cin>>n>>k;vector<int>a(n);for(int&i:a)cin>>i;long long ans=0;for(int i=0;i<n;i++){for(int j=0;j<n;j++){if(i<j && a[i]+a[j]==k)ans++;}}cout<<ans<<\"\\n\";}", "visible_tests": [{"name": "sample_1", "stdin": "6 7\n1 6 2 5 3 4\n", "stdout": "3\n"}], "public_checker": {"type": "exact_stdout", "strip_trailing_whitespace": true}, "compile": {"command": "g++ -std=c++20 -O2 -pipe main.cpp -o main", "timeout_sec": 20}, "run": {"timeout_sec": 2, "memory_mb": 512}, "constraints": {"assistant_format": "one_reasoning_block_then_one_cpp_fence", "must_preserve_io": true, "must_compile": true, "must_pass_visible_tests": true, "target": "optimize runtime without changing outputs"}, "metadata": {"problem_id": "dummy_count_pairs", "baseline_complexity": "O(n^2) pair enumeration", "expected_better_complexity": "O(n) average with hash map or O(n log n) with sorting", "hidden_tests_policy": "not_in_seed", "oracle_acceptance": "full mark only"}, "messages": [{"role": "system", "content": "You are an expert C++20 performance optimizer. Preserve stdin/stdout behavior exactly. Prefer simple, readable algorithmic improvements over micro-optimizations. Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text."}, {"role": "user", "content": "Make the following C++20 solution asymptotically faster if possible, while preserving the exact interface and outputs.\n\nTask: optimize this correct but intentionally inefficient C++20 program. Keep the same input and output behavior.\n\nOriginal program:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,k;cin>>n>>k;vector<int>a(n);for(int&i:a)cin>>i;long long ans=0;for(int i=0;i<n;i++){for(int j=0;j<n;j++){if(i<j && a[i]+a[j]==k)ans++;}}cout<<ans<<\"\\n\";}\n```\n\nVisible tests:\nsample_1 stdin:\n```text\n6 7\n1 6 2 5 3 4\n```\nExpected stdout:\n```text\n3\n```"}], "prompt": "SYSTEM: You are an expert C++20 performance optimizer. Preserve stdin/stdout behavior exactly. Prefer simple, readable algorithmic improvements over micro-optimizations. Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text.\n\nUSER: Make the following C++20 solution asymptotically faster if possible, while preserving the exact interface and outputs.\n\nTask: optimize this correct but intentionally inefficient C++20 program. Keep the same input and output behavior.\n\nOriginal program:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,k;cin>>n>>k;vector<int>a(n);for(int&i:a)cin>>i;long long ans=0;for(int i=0;i<n;i++){for(int j=0;j<n;j++){if(i<j && a[i]+a[j]==k)ans++;}}cout<<ans<<\"\\n\";}\n```\n\nVisible tests:\nsample_1 stdin:\n```text\n6 7\n1 6 2 5 3 4\n```\nExpected stdout:\n```text\n3\n```"}
{"task_id": "dummy_pie_cpp_0004_first_repeated", "source": "dummy_pie_cpp", "split": "oracle_seed", "language": "cpp20", "prompt_template_id": "system_contract_structured_user_spec", "source_code": "#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n;cin>>n;vector<string>s(n);for(auto&x:s)cin>>x;string ans=\"NONE\";for(int i=0;i<n;i++){bool seen=false;for(int j=0;j<i;j++){if(s[j]==s[i])seen=true;}if(seen){ans=s[i];break;}}cout<<ans<<\"\\n\";}", "visible_tests": [{"name": "sample_1", "stdin": "6\nred blue green blue red yellow\n", "stdout": "blue\n"}], "public_checker": {"type": "exact_stdout", "strip_trailing_whitespace": true}, "compile": {"command": "g++ -std=c++20 -O2 -pipe main.cpp -o main", "timeout_sec": 20}, "run": {"timeout_sec": 2, "memory_mb": 512}, "constraints": {"assistant_format": "one_reasoning_block_then_one_cpp_fence", "must_preserve_io": true, "must_compile": true, "must_pass_visible_tests": true, "target": "optimize runtime without changing outputs"}, "metadata": {"problem_id": "dummy_first_repeated", "baseline_complexity": "O(n^2) previous-item scan", "expected_better_complexity": "O(n) average with unordered_set", "hidden_tests_policy": "not_in_seed", "oracle_acceptance": "full mark only"}, "messages": [{"role": "system", "content": "Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text."}, {"role": "user", "content": "optimization_request:\n  language: C++20\n  objective: reduce runtime while preserving behavior\n  checker: exact stdout after trimming trailing whitespace\n  task_id: dummy_pie_cpp_0004_first_repeated\n\nsource_code:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n;cin>>n;vector<string>s(n);for(auto&x:s)cin>>x;string ans=\"NONE\";for(int i=0;i<n;i++){bool seen=false;for(int j=0;j<i;j++){if(s[j]==s[i])seen=true;}if(seen){ans=s[i];break;}}cout<<ans<<\"\\n\";}\n```\n\nvisible_tests:\nsample_1 stdin:\n```text\n6\nred blue green blue red yellow\n```\nExpected stdout:\n```text\nblue\n```"}], "prompt": "SYSTEM: Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text.\n\nUSER: optimization_request:\n  language: C++20\n  objective: reduce runtime while preserving behavior\n  checker: exact stdout after trimming trailing whitespace\n  task_id: dummy_pie_cpp_0004_first_repeated\n\nsource_code:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n;cin>>n;vector<string>s(n);for(auto&x:s)cin>>x;string ans=\"NONE\";for(int i=0;i<n;i++){bool seen=false;for(int j=0;j<i;j++){if(s[j]==s[i])seen=true;}if(seen){ans=s[i];break;}}cout<<ans<<\"\\n\";}\n```\n\nvisible_tests:\nsample_1 stdin:\n```text\n6\nred blue green blue red yellow\n```\nExpected stdout:\n```text\nblue\n```"}
{"task_id": "dummy_pie_cpp_0005_matrix_row_max", "source": "dummy_pie_cpp", "split": "oracle_seed", "language": "cpp20", "prompt_template_id": "user_natural_language_with_inline_contract", "source_code": "#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,m;cin>>n>>m;vector<vector<int>>a(n,vector<int>(m));for(int i=0;i<n;i++)for(int j=0;j<m;j++)cin>>a[i][j];for(int i=0;i<n;i++){int best=INT_MIN;for(int j=0;j<m;j++){for(int k=0;k<m;k++){if(k==j)best=max(best,a[i][k]);}}cout<<best<<(i+1==n?'\\n':' ');} }", "visible_tests": [{"name": "sample_1", "stdin": "3 4\n1 9 2 3\n4 5 6 7\n-3 -8 -1 -2\n", "stdout": "9 7 -1\n"}], "public_checker": {"type": "exact_stdout", "strip_trailing_whitespace": true}, "compile": {"command": "g++ -std=c++20 -O2 -pipe main.cpp -o main", "timeout_sec": 20}, "run": {"timeout_sec": 2, "memory_mb": 512}, "constraints": {"assistant_format": "one_reasoning_block_then_one_cpp_fence", "must_preserve_io": true, "must_compile": true, "must_pass_visible_tests": true, "target": "optimize runtime without changing outputs"}, "metadata": {"problem_id": "dummy_matrix_row_max", "baseline_complexity": "O(nm^2) redundant row maximum scan", "expected_better_complexity": "O(nm)", "hidden_tests_policy": "not_in_seed", "oracle_acceptance": "full mark only"}, "messages": [{"role": "user", "content": "Can you make this C++ program faster without changing what it reads or prints? Please keep it C++20.\n\nProgram:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,m;cin>>n>>m;vector<vector<int>>a(n,vector<int>(m));for(int i=0;i<n;i++)for(int j=0;j<m;j++)cin>>a[i][j];for(int i=0;i<n;i++){int best=INT_MIN;for(int j=0;j<m;j++){for(int k=0;k<m;k++){if(k==j)best=max(best,a[i][k]);}}cout<<best<<(i+1==n?'\\n':' ');} }\n```\n\nTry it on this visible test before returning it:\nsample_1 stdin:\n```text\n3 4\n1 9 2 3\n4 5 6 7\n-3 -8 -1 -2\n```\nExpected stdout:\n```text\n9 7 -1\n```\n\nAnswer format: Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text."}], "prompt": "USER: Can you make this C++ program faster without changing what it reads or prints? Please keep it C++20.\n\nProgram:\n```cpp\n#include <iostream>\n#include <vector>\n#include <string>\n#include <unordered_set>\n#include <unordered_map>\n#include <climits>\n#include <algorithm>\nusing namespace std;\nint main(){ios::sync_with_stdio(false);cin.tie(nullptr);int n,m;cin>>n>>m;vector<vector<int>>a(n,vector<int>(m));for(int i=0;i<n;i++)for(int j=0;j<m;j++)cin>>a[i][j];for(int i=0;i<n;i++){int best=INT_MIN;for(int j=0;j<m;j++){for(int k=0;k<m;k++){if(k==j)best=max(best,a[i][k]);}}cout<<best<<(i+1==n?'\\n':' ');} }\n```\n\nTry it on this visible test before returning it:\nsample_1 stdin:\n```text\n3 4\n1 9 2 3\n4 5 6 7\n-3 -8 -1 -2\n```\nExpected stdout:\n```text\n9 7 -1\n```\n\nAnswer format: Return exactly one <reasoning>...</reasoning> block followed by exactly one fenced ```cpp code block containing an optimized C++20 program. Do not include any other text."}