View Compilation Error

0_0_17817674_17153.cpp: In function 'int main()':
0_0_17817674_17153.cpp:74:17: error: 'ans' was not declared in this scope
                 ans[p++] = '1';
                 ^
0_0_17817674_17153.cpp:76:17: error: 'ans' was not declared in this scope
                 ans[p++] = '0';
                 ^
0_0_17817674_17153.cpp:78:9: error: 'ans' was not declared in this scope
         ans[m] = 0;
         ^