View Compilation Error

0_0_25465727_32022.cpp: In function 'int main()':
0_0_25465727_32022.cpp:21:5: error: 'vis' was not declared in this scope
     vis[a[i]]++;
     ^
0_0_25465727_32022.cpp:23:16: error: expected primary-expression before 'break'
      flag = 0, break;
                ^