Compilare: user.cpp: In function ‘int main()’: user.cpp:133:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sol[ind[i]].size();j++) printf("%d ",sol[ind[i]][j]); ^ user.cpp:98:22: warning: unused variable ‘nrsol’ [-Wunused-variable] int n,c,nr=0,nrsol=0; ^ user.cpp:93:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("piese3.out", "w", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:18:29: 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); ^