View Compilation Error

0_0_26021279_14018.cpp: In function 'int main()':
0_0_26021279_14018.cpp:7:17: error: 'scanf' was not declared in this scope
  scanf("%lld",&t);
                 ^
0_0_26021279_14018.cpp:20:23: error: 'sort' was not declared in this scope
    sort(v[i],v[i]+m[i]);
                       ^
0_0_26021279_14018.cpp:22:15: error: 'sort' was not declared in this scope
   sort(c,c+L-1);
               ^
0_0_26021279_14018.cpp:55:26: error: 'printf' was not declared in this scope
   printf("%lld\n",ans-sum);
                          ^