View Compilation Error

0_0_17656672_1667.cpp: In function 'int main()':
0_0_17656672_1667.cpp:42:12: error: expected initializer before 'a'
   int m, s a, ans = 0;
            ^
0_0_17656672_1667.cpp:46:4: error: 's' was not declared in this scope
    s = 0;
    ^
0_0_17656672_1667.cpp:48:18: error: 'a' was not declared in this scope
     scanf("%d", &a);
                  ^
0_0_17656672_1667.cpp:51:4: error: 'ans' was not declared in this scope
    ans ^= sg[s];
    ^
0_0_17656672_1667.cpp:53:6: error: 'ans' was not declared in this scope
   if(ans == 0)
      ^