Compilare: main.cpp: In function 'void solve(int, int, long long int)': main.cpp:144:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[ind[nod]].size() ; ++i){ ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:174:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[ind[it]].size() ; ++i){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:195:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pensula.out", "w", stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:14:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^