View Compilation Error

0_0_20528365_13144.cpp:1:1: error: 'include' does not name a type
 include<cstdio>  
 ^
0_0_20528365_13144.cpp: In function 'int main()':
0_0_20528365_13144.cpp:48:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&n,&m))  
                             ^
0_0_20528365_13144.cpp:69:26: error: 'printf' was not declared in this scope
         printf("%d\n",ans);  
                          ^