Compilare: user.cpp: In function ‘void Read()’: user.cpp:21:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&N,&M,&K); ^ user.cpp:24:81: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d", &a[i].x1, &a[i].y1, &a[i].x2, &a[i].y2, &a[i].v); ^ user.cpp: In function ‘int main()’: user.cpp:106:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.in","r",stdin); ^ user.cpp:107:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.out","w",stdout); ^ user.cpp:134:88: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] else if( v[i][j] == ans ) nr += 1LL * ( fx[i+1] - fx[i] ) * ( fy[j+1] - fy[j] ); ^