Compilare: main.cpp: In function 'int main()': main.cpp:90:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0 ; j < ev[i].size() ; j++ ){ ~~^~~~~~~~~~~~~~ main.cpp:70:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&n,&k,&q); ^ main.cpp:72:53: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&v[i].first,&v[i].second); ^