Compilare: user.cpp: In member function ‘std::pair<_T1, _T2> MinCostFlow<Flow, Cost>::search(int, int)’: user.cpp:110:13: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if (used[x]) continue; used[x] = true; ^~ user.cpp:110:36: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ if (used[x]) continue; used[x] = true; ^~~~ user.cpp: In function ‘int main()’: user.cpp:142:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.inp", "r", stdin); ^ user.cpp:143:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out", "w", stdout); ^