Compilare: user.cpp: In function ‘int main()’: user.cpp:42:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1;i < sol.size();i++) { ^ user.cpp:52:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(nrc <= cf.size()) { ^ user.cpp:55:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = cf.size() - nrc;j < cf.size() && ok;j++) { ^ user.cpp:70:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < cf.size();i++) ^ user.cpp:19:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^