Compilare: user.cpp: In function ‘int main()’: user.cpp:195:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ^ user.cpp:196:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j < v.size(); j++) ^ user.cpp:2:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define for0(i, n) for(int i = 0; i < n; i++) ^ user.cpp:211:5: note: in expansion of macro ‘for0’ for0(i, v.size()) if(!trecut[i]) ^ user.cpp:180:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.in", "r", stdin); ^ user.cpp:181:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.out", "w", stdout); ^