algorithmic/problems/141/interactor.cc

#include "testlib.h"
#include <vector>
#include <deque>
#include <set>
#include <string>

int main(int argc, char* argv[]) {
    registerInteraction(argc, argv);

    int n = inf.readInt();
    int k = inf.readInt();
    
    std::vector<int> hidden_array(n + 1);
    for (int i = 1; i <= n; ++i) {
        hidden_array[i] = inf.readInt();
    }

    long long ref_cost = ans.readLong();

    println(n, k);

    const int MAX_OPERATIONS = 100000;
    int query_count = 0;
    int reset_count = 0;
    
    std::deque<int> S; // Memory queue

    while (true) {
        std::string operation = ouf.readToken();

        if (operation == "?") { // Query
            query_count++;
            
            if (query_count + reset_count > MAX_OPERATIONS) {
                quitp(0.0, "Operation limit exceeded. Max operations: %d. Ratio: 0.0000", MAX_OPERATIONS);
            }

            int c = ouf.readInt();
            
            if (c < 1 || c > n) {
                quitf(_wa, "Invalid query: bakery index must be between 1 and %d", n);
            }

            int cake_type = hidden_array[c];
            
            // Check if cake_type is in S
            bool found = false;
            for (int val : S) {
                if (val == cake_type) {
                    found = true;
                    break;
                }
            }
            
            // Output Y or N
            if (found) {
                println("Y");
            } else {
                println("N");
            }
            
            // Add cake_type to the end of S
            S.push_back(cake_type);
            
            // If |S| > k, remove front
            if ((int)S.size() > k) {
                S.pop_front();
            }

        } else if (operation == "R") { // Reset
            reset_count++;
            
            if (query_count + reset_count > MAX_OPERATIONS) {
                quitp(0.0, "Operation limit exceeded. Max operations: %d. Ratio: 0.0000", MAX_OPERATIONS);
            }
            
            // Clear S (no response to contestant)
            S.clear();

        } else if (operation == "!") { // Final answer
            int d = ouf.readInt();

            if (d < 1 || d > n) {
                quitf(_wa, "Invalid answer: d must be between 1 and %d", n);
            }

            // Calculate the actual number of distinct values
            std::set<int> distinct_values;
            for (int i = 1; i <= n; ++i) {
                distinct_values.insert(hidden_array[i]);
            }
            int actual_d = distinct_values.size();

            if (d != actual_d) {
                quitp(0.0, "Wrong answer: expected %d, got %d. Ratio: 0.0000", actual_d, d);
            }

            // Calculate cost
            long long your_cost = (long long)reset_count * n + query_count + 1;

            double score_ratio = std::min(1.0, (double)ref_cost / your_cost);
            double unbounded_ratio = (double)ref_cost / your_cost;
            quitp(score_ratio, "Correct in %d queries and %d resets. Cost: %lld. Ratio: %.4f, RatioUnbounded: %.4f", 
                  query_count, reset_count, your_cost, score_ratio, unbounded_ratio);
            break;

        } else {
            quitf(_wa, "Invalid operation: expected '?', 'R', or '!', but got '%s'", operation.c_str());
        }
    }

    return 0;
}