Compilare: user.cpp: In function ‘bool verif()’: user.cpp:119:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cond.size(); i++) ^ user.cpp: In function ‘bool solve()’: user.cpp:175:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < rad.size(); i++) ^ user.cpp:178:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rad.size(); i++) ^ user.cpp:181:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(mch.size() != N - 1) ^ user.cpp: In function ‘int main()’: user.cpp:202:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < mch.size(); i++) ^ user.cpp: In function ‘char gchar()’: user.cpp:17:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] cnt = 0, fread(buff, buffer, 1, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:189:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revolve.in", "r", stdin); ^ user.cpp:190:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revolve.out", "w", stdout); ^