View Compilation Error

0_0_30487366_31377.cpp: In function 'int main()':
0_0_30487366_31377.cpp:29:22: error: 'i' was not declared in this scope
                 if(s[i+k]!=ch[4][k])
                      ^
0_0_30487366_31377.cpp: At global scope:
0_0_30487366_31377.cpp:36:1: error: expected declaration before '}' token
 }
 ^