View Compilation Error

0_0_29466544_24399.cpp: In function 'int main()':
0_0_29466544_24399.cpp:34:26: error: 'scanf' was not declared in this scope
 while(scanf("%d %d",&n,&m)!=EOF)
                          ^
0_0_29466544_24399.cpp:34:29: error: 'EOF' was not declared in this scope
 while(scanf("%d %d",&n,&m)!=EOF)
                             ^
0_0_29466544_24399.cpp:50:15: error: 'printf' was not declared in this scope
 printf("YES\n");
               ^
0_0_29466544_24399.cpp:54:15: error: 'printf' was not declared in this scope
 printf("YES\n");
               ^
0_0_29466544_24399.cpp:55:19: error: 'printf' was not declared in this scope
 else printf("NO\n");
                   ^