Compilare: user.cpp: In function ‘int main()’: user.cpp:72:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < v.size();i++) ^ user.cpp:116:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < per.size();i++) ^ user.cpp:62:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &m, &n); ^