Compilare: user.cpp: In function ‘int main()’: user.cpp:57:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j < r[i].size();j ++) ~~^~~~~~~~~~~~~ user.cpp:44:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:46:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&h[i]); ^