View Compilation Error

0_0_25458426_7079.cpp: In function 'int main()':
0_0_25458426_7079.cpp:73:27: error: 'struct node' has no member named 'v'
             if(i>=2&&a[i].v==a[i-1].v) b[a[i].id]=b[a[i-1].id];
                           ^
0_0_25458426_7079.cpp:73:37: error: 'struct node' has no member named 'v'
             if(i>=2&&a[i].v==a[i-1].v) b[a[i].id]=b[a[i-1].id];
                                     ^