Compilare: user.cpp: In function ‘int main()’: user.cpp:99:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < v[n].size();i++) { ^ user.cpp:87:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:90:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &a, &b, &c); ^