Compilare: main.cpp: In function 'int main()': main.cpp:61:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%lld",&n,&m); ^ main.cpp:67:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%lld",&i,&j,&d); ^ main.cpp: In function 'void ciur()': main.cpp:22:15: warning: iteration 44720 invokes undefined behavior [-Waggressive-loop-optimizations] if(c[i]==0) prime[++nr]=i; ~~~^ main.cpp:21:14: note: within this loop for(i=2;i<=44722;i++) ~^~~~~~~