Compilare: user.cpp: In function ‘int main()’: user.cpp:57:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < odd.size(); i++) { ^ user.cpp:60:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < odd.size(); j++) { ^ user.cpp:17:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mmo.in", "r", stdin); ^ user.cpp:18:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mmo.out", "w", stdout); ^ user.cpp:20:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:25:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &c); ^