Compilare: user.cpp: In function ‘int main()’: user.cpp:25:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(e.first + e.second.size()== n) ^ user.cpp:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(e.second.size()>current_max) ^ user.cpp:14:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:17:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^