Compilare: main.cpp: In function 'int main()': main.cpp:13:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&n,&p,&q,&m); ^ main.cpp:20:53: 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); ^ main.cpp:12:19: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] int n,p,q,m,i,sol,poz,pf; ^~~