Compilare: user.cpp: In function ‘int main()’: user.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1;i < sol.size();i++) { ~~^~~~~~~~~~~~ user.cpp:55:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = cf.size() - nrc;j < cf.size() && (!ok);j++) { ~~^~~~~~~~~~~ user.cpp:69:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < cf.size();i++) ~~^~~~~~~~~~~ user.cpp:21:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^