0_0_13807637_22044.cpp:69:9: error: stray '\' in program O[idx++] = (i-1)\n; ^ 0_0_13807637_22044.cpp: In function 'bool dfs()': 0_0_13807637_22044.cpp:69:26: error: expected ';' before 'n' O[idx++] = (i-1)\n; ^