Compilare: user.cpp: In function ‘int main()’: user.cpp:126:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0 ; i < sol.size() - 1 ; i++) ^ user.cpp:132:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0 ; j < sol2.size() && ok; j++) ^ user.cpp:49:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("comoditate.in","r",stdin); ^ user.cpp: In function ‘int getint()’: user.cpp:33:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++ptr>=maxb) fread(buf,maxb,1,stdin),ptr=0; ^ user.cpp:36:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++ptr>=maxb) fread(buf,maxb,1,stdin),ptr=0; ^