View Compilation Error

0_0_37409552_1844.cpp: In function 'int main()':
0_0_37409552_1844.cpp:62:11: error: 'link' was not declared in this scope
    ans+=w[link y[i]][i];
           ^
0_0_37409552_1844.cpp:62:16: error: expected ']' before 'y'
    ans+=w[link y[i]][i];
                ^