View Compilation Error

0_0_21188494_13529.cpp: In function 'int main()':
0_0_21188494_13529.cpp:14:5: error: '_int64' was not declared in this scope
     _int64 t, n, m, i, j, res;
     ^
0_0_21188494_13529.cpp:15:21: error: 't' was not declared in this scope
     scanf("%l64d", &t);
                     ^
0_0_21188494_13529.cpp:18:25: error: 'n' was not declared in this scope
         scanf("%l64d", &n);
                         ^
0_0_21188494_13529.cpp:19:9: error: 'res' was not declared in this scope
         res =0LL;
         ^
0_0_21188494_13529.cpp:20:13: error: 'i' was not declared in this scope
         for(i = 0; i < n; i++)
             ^
0_0_21188494_13529.cpp:27:13: error: 'i' was not declared in this scope
         for(i = 0; i < n; i++)
             ^