Compilare: main.cpp: In function 'int main()': main.cpp:17:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:19:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a); ^ main.cpp:24:20: warning: iteration 10004 invokes undefined behavior [-Waggressive-loop-optimizations] while(frecv[i]>0){ ~~~~~~~^ main.cpp:23:14: note: within this loop for(i=1;i<=10005;i++){ ~^~~~~~~