View Compilation Error

0_0_36646410_20855.cpp: In function 'int main()':
0_0_36646410_20855.cpp:47:17: error: redeclaration of 'int cnt'
   int left = 0, cnt = 0, maxlen = S.size() + 1;
                 ^
0_0_36646410_20855.cpp:30:13: note: 'int cnt' previously declared here
         int cnt = 0;
             ^