View Compilation Error

0_0_26093350_14050.cpp: In function 'void dfs(int, int)':
0_0_26093350_14050.cpp:51:16: error: 'd' was not declared in this scope
         dp[u]=(d[u]+dp[v]+(N-sum[v])*sum[v]%mod*w%mod)%mod;
                ^