Compilare: user.cpp: In function ‘int main()’: user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cool.in", "r", stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cool.out", "w", stdout); ^ user.cpp:83:13: warning: iteration 1000u invokes undefined behavior [-Waggressive-loop-optimizations] v[j]=0; ^ user.cpp:82:15: note: containing loop for(j=1;j<=1001;j++) ^ user.cpp:76:6: warning: ‘pp’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(pp==0){ ^