Compilare: main.cpp: In function 'int main()': main.cpp:90:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < p.size() && p[j] <= p[lp[i] - 1] && 1LL * i * p[j] <= m ; ++j) ~~^~~~~~~~~~ main.cpp:98:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = lp[i] - 1; j < p.size() && 1LL * i * p[j] <= m ; ++j) ~~^~~~~~~~~~ main.cpp:73:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tygyn.out", "w", stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:15:29: 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); ^