I am getting error

prog.cpp: In lambda function:

prog.cpp:118:28: error: use of ‘dfs’ before deduction of ‘auto’

118 | for(ll it: nde[i]) dfs(it,fren[i]);

In this code , ll means long long, nde[i] is a vector of int

auto dfs = [&](int i,int x)->void{
        fren[i]+=x;
        for(ll it: nde[i]) dfs(it,fren[i]);
    };
dfs(0,0);

Writing a blog in codeforces for first time

C++ 17 online compiler

Worked using

    function<void(int, int)> dfs = [&](int i, int x) -> void {
        fren[i] += x;
        for (ll it : nde[i])
            dfs(it, fren[i]);
};

Also by changing vector<int> nde[n] to vector<vector<int>> nde(n) and by using the function

    auto dfs = [&](int i,int x, auto &&dfs)->void{
        fren[i]+=x;
        for(ll it: nde[i]) dfs(it,fren[i], dfs);
    };
    dfs(0,0,dfs);