View Compilation Error

0_0_21458567_17274.cpp: In function 'int main()':
0_0_21458567_17274.cpp:6:23: error: 'scanf' was not declared in this scope
     while(scanf("%s",a)!=EOF){
                       ^
0_0_21458567_17274.cpp:6:26: error: 'EOF' was not declared in this scope
     while(scanf("%s",a)!=EOF){
                          ^
0_0_21458567_17274.cpp:13:41: error: 'min' was not declared in this scope
             p[i]=mx>i?min(p[2*id-i],mx-i):1;
                                         ^
0_0_21458567_17274.cpp:18:26: error: 'printf' was not declared in this scope
         printf("%d\n",res);
                          ^