Compilare: user.cpp: In function ‘int main()’: user.cpp:40:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < oy.size(); i++) ^ user.cpp:41:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < oy.size(); j++) ^ user.cpp:44:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ox.size(); i++) ^ user.cpp:50:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < oy.size(); j++) ^ user.cpp:72:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < oy.size(); j++) ^ user.cpp:73:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = j + 1; k < oy.size(); k++) ^ user.cpp:18:39: 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); ^ user.cpp:19:41: 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); ^ user.cpp:22:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:26:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &xx1, &yy1); ^ user.cpp:27:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &xx2, &yy2); ^