View Compilation Error

0_0_38277046_26344.cpp: In function 'int main()':
0_0_38277046_26344.cpp:20:16: error: 'i' was not declared in this scope
         while (i <= j && l < len)
                ^
0_0_38277046_26344.cpp:20:21: error: 'j' was not declared in this scope
         while (i <= j && l < len)
                     ^