Compilare: main.cpp: In function 'int main()': main.cpp:54:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ main.cpp:60:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&j); ^ main.cpp:67:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&c,&a,&b); ^ main.cpp:56:9: warning: iteration 1004999 invokes undefined behavior [-Waggressive-loop-optimizations] v[i]=-1; ~~~~^~~ main.cpp:55:16: note: within this loop for(int i=1;i<=1005000;i++) ~^~~~~~~~~