View Compilation Error

0_0_23425694_1274.cpp: In function 'int main()':
0_0_23425694_1274.cpp:3:5: error: '__int64' was not declared in this scope
     __int64 i,n,sum[100001];
     ^
0_0_23425694_1274.cpp:4:5: error: 'sum' was not declared in this scope
     sum[0]=0;
     ^
0_0_23425694_1274.cpp:6:9: error: 'i' was not declared in this scope
     for(i=0;i<100001;i++)
         ^
0_0_23425694_1274.cpp:13:26: error: 'n' was not declared in this scope
     while(scanf("%I64d",&n)&&n>=0)
                          ^
0_0_23425694_1274.cpp:13:27: error: 'scanf' was not declared in this scope
     while(scanf("%I64d",&n)&&n>=0)
                           ^
0_0_23425694_1274.cpp:15:32: error: 'printf' was not declared in this scope
         printf("%I64d\n",sum[n]);
                                ^