Submission #144140

#	Time	Username	Problem	Language	Result	Execution time	Memory
144140		LeMur	Izlet (COI19_izlet)	C++14	0 / 100	847 ms	72080 KiB

izlet

////////////////////////////////////////////    _LeMur_
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#define _CRT_SECURE_NO_WARNINGS
#include <unordered_map>
#include <unordered_set>
#include <functional>
#include <algorithm>
#include <iostream>
#include <cstring>
#include <cassert>
#include <chrono>
#include <random>
#include <bitset>
#include <cstdio>
#include <vector>
#include <string>
#include <ctime>
#include <stack>
#include <queue>
#include <cmath>
#include <list>
#include <map>
#include <set>

using namespace std;

const int N = 3005;
const int inf = 1000 * 1000 * 1000;
const int mod = 1000 * 1000 * 1000 + 7;

int t;
int n;
int a[N][N];

vector <int> g[N];
int answ[N];

vector < pair<int,int> > edge;
int used[N];

int main(){
	mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
    cin >> t;
    cin >> n;
    int s = 0 , id;
    for(int i=1;i<=n;i++){
        int mx = 0;
        for(int j=1;j<=n;j++){
            scanf("%d",&a[i][j]);
            mx = max(mx , a[i][j]);
        }
        if(mx > s){
            s = mx;
            id = i;
        }
    }
    for(int i=1;i<=n;i++){
        g[ a[id][i] ].push_back(i);
        answ[i] = a[id][i];
    }
    for(int i=1;i<=s;i++){
        set <int> q;
        for(int j=0;j<(int)g[i].size();j++){
            q.insert(g[i][j]);
        }
        int col = 0;
        while(!q.empty()){
            ++col;
            int v = *q.begin();
            q.erase(q.begin());
            bool T = false;
            while(true){
                used[v] = col;
                bool flag = false;
                int go = -1;
                for(int h=0;h<(int)g[i].size();h++){
                    int p = g[i][h];
                    if(used[p])continue;
                    if(v == p || a[v][p] != 1)continue;
                    if(q.find(p) == q.end()){
                        edge.push_back(make_pair(v , p));
                        T = true;
                        break;
                    }
                    go = p;
                }
                if(T)break;
                if(!flag){
                    for(int j=0;j<(int)g[i - 1].size();j++){
                        int p = g[i - 1][j];
                        if(a[v][p] == 2){
                            edge.push_back(make_pair(v , p));
                            flag = true;
                            break;
                        }
                    }
                    if(flag == false){
                        if(i == 1)break;
                        assert(go != -1);
                        edge.push_back(make_pair(v , go));
                        v = go;
                        q.erase(v);
                    }
                    else
                        break;
                }
            }
        }
    }
    for(int i=1;i<=n;i++){
        cout << answ[i] << " ";
    }
    cout << endl;
    for(int i=0;i<n-1;i++){
        cout << edge[i].first << " " << edge[i].second << endl;
    }
    return 0;
}
/*
2
4
1 2 2 2
2 1 2 2
2 2 1 2
2 2 2 1
*/

Compilation message (stderr)

izlet.cpp: In function 'int main()':
izlet.cpp:50:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&a[i][j]);
             ~~~~~^~~~~~~~~~~~~~~
izlet.cpp:60:26: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
         answ[i] = a[id][i];
                   ~~~~~~~^

• Subtask 1: 0 / 18
• Subtask 2: 0 / 25
• Subtask 3: 0 / 57