Submission #1066360

#	Time	Username	Problem	Language	Result	Execution time	Memory
1066360		Mr_Husanboy	Make them Meet (EGOI24_makethemmeet)	C++17	0 / 100	1 ms	348 KiB

Main

//#pragma GCC optimize("Ofast,O3")
//#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
using namespace std;
 
 
 
#ifdef LOCAL
#include "debugger.cpp"
#else
#define debug(...)
#endif
template<class T>
int len(T &a){
    return a.size();
}
 
using ll = long long;
using pii = pair<int,int>;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
string fileio = "";
 
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll infl = 1e18;
const int maxn = 1e5 + 1;
 
 
 
 
 
void yesno(bool ok){
    cout << (ok ? "Yes\n" : "No\n");
}
 
 
void solve(){
    int n; cin >> n;
    int m; cin >> m;
    vector<vector<int>> g(n);
    int root = 0;
    for(int i = 0; i < m; i ++){
        int a, b; cin >> a >> b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    for(int i = 0; i < n; i ++) if(len(g[i]) == 1){
        root = i; break;
    }

    vector<int> par(n);
    vector<int> dis(n);
    vector<int> vis(n);

    auto dfs = [&](auto &dfs, int i, int c = 0)->void{
        vis[i] = 1;
        for(auto u : g[i]){
            if(vis[u]) continue;
            dis[u] = dis[i] + 1;
            par[u] = i;
            dfs(dfs, u, c ^ 1);
        }
    };
    dfs(dfs, root);
    cout << n * (n - 1) / 2 <<'\n';

    for(int i = 0; i < (n * (n - 1)) / 2; i ++){
        for(int j = 0; j < n; j ++){
            if(j == root){
                cout << "0 "; continue;
            }
            if(dis[j] % 2 != i % 2){
                cout << dis[j] << ' ';
            }else{
                cout << dis[par[j]] << ' ';
            }
        }
        cout << '\n';
    }
}
 
int main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    auto start = chrono::high_resolution_clock::now();
    #ifndef LOCAL
    if(fileio.size()){
        freopen((fileio + ".in").c_str(), "r", stdin);
        freopen((fileio + ".out").c_str(), "w", stdout);
    }
    #endif
    int testcases = 1;
    #ifdef Tests
    cin >> testcases;
    #endif
    while(testcases --){
        solve();
        if(testcases) cout << '\n';
        #ifdef LOCAL
        else cout << '\n';
        cout << "_________________________" << endl;
        #endif
    }
    #ifdef LOCAL
    auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start);
    
    cout << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl;
    #endif
    return 0;
}   

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:87:10: warning: variable 'start' set but not used [-Wunused-but-set-variable]
   87 |     auto start = chrono::high_resolution_clock::now();
      |          ^~~~~
Main.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen((fileio + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen((fileio + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 13
• Subtask 3: 0 / 11
• Subtask 4: 0 / 36
• Subtask 5: 0 / 30