Submission #1261415

#	Time	Username	Problem	Language	Result	Execution time	Memory
1261415		riddles	World Map (IOI25_worldmap)	C++20	Compilation error	0 ms	0 KiB

worldmap

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef map<ll, ll> mp;
typedef pair<ll, ll> pll;
typedef queue<ll> qi;
typedef vector<ll> vi;
typedef vector <vi> vvi;
typedef vector <pll> vpl;
typedef vector <string> vs;
#define YES cout<<"YES\n"
#define Yes cout<<"Yes\n"
#define NO cout<<"NO\n"
#define No cout<<"No\n"
#define F first
#define S second
#define pb push_back
#define all(x) begin(x), end(x)
#define V vector

void setIO(string name = "") {
    ios_base::sync_with_stdio(0); cin.tie(0);
    if ((ll)(name.size())) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}

V<int>adj[41];
V<int>t[41];
bool vis[41];
V<int>v;
void dfs(int n) {
    vis[n]=true;
    for (auto u:adj[n]) {
        if (!vis[u]) {
            t[u].pb(n);
            t[n].pb(u);
            dfs(u);
        }
    }
}
void dfs1(int n,int p) {
    v.pb(n);
    for (auto u:t[n]) {
        if (u==p)continue;
        dfs1(u,n);
    }
    if (p!=-1) {
        v.pb(p);
    }
}

void solve(){
  ll N=5, M=4;

  vector<int> A={1, 2, 3, 4};
  vector<int> B={2, 3, 4, 5};
    //if(N == 1) return {{1}};

    vector<vector<int>> adj(N + 1);
    for(int i = 0; i < M; ++i) {
        adj[A[i]].push_back(B[i]);
        adj[B[i]].push_back(A[i]);
    }

    vector<bool> vis(N + 1);

    vector<int> tour;
    auto dfs = [&](int v, auto &&dfs) -> void {
        tour.push_back(v);
        vis[v] = 1;

        for(auto u: adj[v]) {
            if(vis[u]) continue;

            dfs(u, dfs);

            tour.push_back(v);
        }
    };

    dfs(1, dfs);

    tour.resize(2 * N, 1);

    fill(all(vis), 0);

    vector<vector<int>> ans(4 * N, vector<int>(4 * N));

    int r = 0;
    for(int i = 0; i < 2 * N; ++i) {
        int v = tour[i];

        fill(all(ans[r]), v), r++;

        if(vis[v]) continue;
        vis[v] = 1;

        fill(all(ans[r]), v);
        int c = 0;
        for(auto u: adj[v])
            ans[r][c] = u, c += 2;
        r++;

        fill(all(ans[r]), v), r++;
    }

  for(ll i=0; i<4*N; i++){
    for(ll j=0; j<4*N; j++) cout<<ans[i][j]<<' ';
    cout<<'\n';
  }
}
 
int main(){
  setIO("");
  ll k=1;
  //cin>>k;
  while (k--) solve();
  return 0;
}

Compilation message (stderr)

worldmap.cpp: In function 'void setIO(std::string)':
worldmap.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
worldmap.cpp:25:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccZRmjns.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccloMU8G.o:worldmap.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccZRmjns.o: in function `main':
grader.cpp:(.text.startup+0x635): undefined reference to `create_map(int, int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status