Ratsun reitit

input/code.cpp: In function 'int main()':
input/code.cpp:35:18: warning: unused variable 'u' [-Wunused-variable]
         for(auto u : graph[i]){
                  ^

#include<bits/stdc++.h>
using namespace std;

vector<int> graph[101010];
vector<pair<int,int>> graphi[1010][1010];
int main(){
    int n;
    cin >> n;
    
    
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            graphi[i][j].push_back({i-2,j+1});
            graphi[i][j].push_back({i-2,j-1});
            graphi[i][j].push_back({i+2,j-1});
            graphi[i][j].push_back({i+2,j+1});
            graphi[i][j].push_back({i-1,j+2});
            graphi[i][j].push_back({i-1,j-2});
            graphi[i][j].push_back({i+1,j-2});
            graphi[i][j].push_back({i+1,j+2});
        }
    }
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            for(auto u : graphi[i][j]){
                if(!(u.first < 0 || u.first >= n || u.second < 0 || u.second >= n)){
                    graph[i*n+j].push_back(u.first*n+u.second);
                }
            }
        }
    }
    
    for(int i = 0; i < n*n; i++){
    //    cout << i << ": ";
        for(auto u : graph[i]){
    //        cout << u << " ";
        }
    //    cout << "\n";
    }
    queue<int> qu = {};
    int dist[101010];
    int z[101010];
    for(int i = 0; i < 101010; i++){
        dist[i] = 1e7;
        z[i] = 0;
    }
    z[0] = 1;
    dist[0] = 0;
    qu.push(0);
    while(!qu.empty()){
        int s = qu.front();
        qu.pop();
        
        for(auto u : graph[s]){
            if(z[u]) continue;
            z[u] = 1;
            dist[u] = dist[s]+1;
            qu.push(u);
        }
    }
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            cout << dist[i*n+j] << " ";
        }
        cout << "\n";
    }
    
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED