View Compilation Error

0_0_30216082_32129.cpp: In function 'int main()':
0_0_30216082_32129.cpp:10:2: error: 'cin' was not declared in this scope
  cin >> t;
  ^
0_0_30216082_32129.cpp:13:25: error: 'memset' was not declared in this scope
   memset(a, 0, sizeof(a));
                         ^
0_0_30216082_32129.cpp:51:33: error: 'abs' was not declared in this scope
     if (inf >= abs(b[i] - sum[j]))
                                 ^
0_0_30216082_32129.cpp:57:30: error: 'max' was not declared in this scope
       lena = max(lena, len[j]);
                              ^
0_0_30216082_32129.cpp:70:4: error: 'cout' was not declared in this scope
    cout << lena << endl;
    ^
0_0_30216082_32129.cpp:70:20: error: 'endl' was not declared in this scope
    cout << lena << endl;
                    ^