View Compilation Error

0_0_34384709_22922.cpp: In function 'std::string bfs(std::vector<int>, std::vector<int>)':
0_0_34384709_22922.cpp:123:9: error: redeclaration of 'int endval'
     int endval = cantor(end);
         ^
0_0_34384709_22922.cpp:70:9: note: 'int endval' previously declared here
     int endval = cantor(end);
         ^