Compilare: main.cpp: In function 'void solve_test()': main.cpp:85:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (best_row > bad[0].size ()) { ~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:88:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < bad[0].size (); j++) ~~^~~~~~~~~~~~~~~~ main.cpp:97:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (best_col > bad[0].size ()) { ~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:100:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < bad[0].size (); i++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:116:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("polihroniade.in", "r", stdin); ^ main.cpp:117:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("polihroniade.out", "w", stdout); ^