Compilare: user.cpp: In function ‘int main()’: user.cpp:21:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuburi3.in","r",stdin); ^ user.cpp:22:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuburi3.out","w",stdout); ^ user.cpp:26:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:30:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&e[i].x,&e[i].y); ^ user.cpp:55:39: warning: ‘idx’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n",nr[idx],best[idx]); ^ user.cpp:57:19: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] while( fiu[sol] ) ^