HackerEarth Just shortest distance problem solution

1. Given a number X answer what is the shortest distance from the vertex 1 to the vertex X.
2. Given two integers X, Y add the new oriented edge from X to Y.

#include<bits/stdc++.h>

const int N = 1050;

using namespace std;

int n, m;
int dist[N];
vector<int> g[N];

void update(int v)
{
    for (int i = 0; i < g[v].size(); i++)
    {
        int to = g[v][i];
        if (dist[to]>dist[v] + 1)
        {
            dist[to] = dist[v] + 1;
            update(to);
        }
    }
}


int main(){
    ios_base::sync_with_stdio(0);

    cin >> n >> m;

    for (int i = 2; i <= n; i++)
        dist[i] = 1e9;

    for (int i = 1; i <= m; i++)
    {
        int tp;
        cin >> tp;

        if (tp == 1)
        {
            int x;
            cin >> x;
            if (dist[x] > 1e8)
                cout << -1 << endl;
            else
                cout << dist[x] << endl;
        }
        if (tp == 2)
        {
            int a, b;
            cin >> a >> b;
            g[a].push_back(b);
            if (dist[b] > dist[a] + 1)
            {
                dist[b] = dist[a] + 1;
                update(b);
            }
        }
    }

    return 0;
}