View Compilation Error

0_0_16438239_25362.cpp: In function 'int solve()':
0_0_16438239_25362.cpp:50:13: error: 'cnt' was not declared in this scope
             cnt++;
             ^
0_0_16438239_25362.cpp:53:12: error: 'cnt' was not declared in this scope
     return cnt;
            ^