Compilare: main.cpp: In function 'bool check(int)': main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vert.size (); i++) ~~^~~~~~~~~~~~~~ main.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < vert.size (); j++) ~~^~~~~~~~~~~~~~ main.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < good.size (); i++) ~~^~~~~~~~~~~~~~ main.cpp:48:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < good.size (); j++) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("segmente.in", "r", stdin); ^ main.cpp:59:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("segmente.out", "w", stdout); ^