View Compilation Error

0_0_29466567_20783.cpp: In function 'int main()':
0_0_29466567_20783.cpp:35:26: error: 'scanf' was not declared in this scope
 while(scanf("%d %d",&n,&m)!=EOF)
                          ^
0_0_29466567_20783.cpp:35:29: error: 'EOF' was not declared in this scope
 while(scanf("%d %d",&n,&m)!=EOF)
                             ^
0_0_29466567_20783.cpp:51:15: error: 'printf' was not declared in this scope
 printf("YES\n");
               ^
0_0_29466567_20783.cpp:55:15: error: 'printf' was not declared in this scope
 printf("YES\n");
               ^
0_0_29466567_20783.cpp:56:19: error: 'printf' was not declared in this scope
 else printf("NO\n");
                   ^