View Compilation Error

0_0_30441676_16055.cpp:10:1: error: 'll' does not name a type
 ll ans;
 ^
0_0_30441676_16055.cpp: In function 'void mergeSort(int, int)':
0_0_30441676_16055.cpp:23:13: error: 'ans' was not declared in this scope
             ans += mid - p; //记录逆序对个数
             ^
0_0_30441676_16055.cpp: In function 'int main()':
0_0_30441676_16055.cpp:43:9: error: 'ans' was not declared in this scope
         ans = 0;
         ^