| { | |
| "name": "costas_array_n10__v0_nh", | |
| "problem_type": "costas_array", | |
| "params": { | |
| "n": 10 | |
| }, | |
| "prompt": "Find a Costas array of order 10: place 10 marks on an 10x10 grid, one per row and one per column, such that all 10*(9)/2 displacement vectors (dr, dc) between pairs of marks (with dc > 0) are pairwise distinct.\n\nReturn x as a list of 10 integers in 0..9, where x[c] is the row of the mark in column c (permutation), or state \"UNSATISFIABLE\" if no such array exists.", | |
| "satisfiable": true, | |
| "solution": { | |
| "x": [ | |
| 8, | |
| 5, | |
| 6, | |
| 0, | |
| 2, | |
| 1, | |
| 4, | |
| 9, | |
| 7, | |
| 3 | |
| ] | |
| }, | |
| "difficulty": { | |
| "solve_time_ms": 1070.6, | |
| "search_space": 3628800, | |
| "num_variables": 10, | |
| "num_constraints": 11, | |
| "num_edges": -1, | |
| "backend": "pycsp", | |
| "solve_tier": "hard", | |
| "solve_pct_global": 75.75, | |
| "solve_pct_type": 72.22 | |
| }, | |
| "partial_assignment": null | |
| } | |