View Compilation Error

0_0_13600939_13094.cpp: In function 'int main()':
0_0_13600939_13094.cpp:37:24: error: 'j' was not declared in this scope
         for (int i=0;i<j;i++)
                        ^
0_0_13600939_13094.cpp:42:26: error: 'j' was not declared in this scope
         for (int k=0;k<a-j;k++)
                          ^