View Compilation Error

0_0_17273720_21642.cpp: In function 'int main()':
0_0_17273720_21642.cpp:9:5: error: '_int64' was not declared in this scope
     _int64 arr[1000],s,k;  
     ^
0_0_17273720_21642.cpp:12:9: error: 'k' was not declared in this scope
         k=0;  
         ^
0_0_17273720_21642.cpp:20:13: error: 's' was not declared in this scope
             s=0;  
             ^
0_0_17273720_21642.cpp:25:13: error: 'arr' was not declared in this scope
             arr[k++]=s;  
             ^
0_0_17273720_21642.cpp:28:14: error: 'arr' was not declared in this scope
         sort(arr,arr+k);  
              ^