View Compilation Error

0_0_22657642_18822.cpp: In function 'node mulit(int, int, int, node, node, long long int)':
0_0_22657642_18822.cpp:26:36: error: 'j1' was not declared in this scope
                 c.a[i][k]+=(a.a[i][j1
                                    ^
0_0_22657642_18822.cpp:27:13: error: expected ']' before '}' token
             }
             ^
0_0_22657642_18822.cpp:27:13: error: expected ')' before '}' token