View Compilation Error

0_0_25596590_31074.cpp: In function 'int main()':
0_0_25596590_31074.cpp:36:7: error: 'i' was not declared in this scope
   for(i=0;i<n;i++)
       ^
0_0_25596590_31074.cpp:42:8: error: 'j' was not declared in this scope
    for(j=1;j<len;j++)
        ^
0_0_25596590_31074.cpp:69:7: error: 'i' was not declared in this scope
   for(i=1;i<=n;i++)
       ^