Submission #491313

#	Time	Username	Problem	Language	Result	Execution time	Memory
491313		qwerasdfzxcl	Simurgh (IOI17_simurgh)	C++14	0 / 100	1 ms	1228 KiB

simurgh

#include "simurgh.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
const int INF = 1e9;
int adj[505][505], n;
bool chk[505];

int calc(int p, int l, int r){
    vector<int> Q;
    for (int i=l;i<=r;i++) Q.push_back(adj[p][i]);
    int cnt = 0;
    Q.push_back(adj[0][p]);
    if (chk[p]) cnt++;

    for (int i=1;i<n;i++) if (!(l<=i && i<=r) && i!=p){
        Q.push_back(adj[0][i]);
        if (chk[i]) cnt++;
    }

    return count_common_roads(Q) - cnt;
}

std::vector<int> find_roads(int N, std::vector<int> u, std::vector<int> v) {
    n = N;
    fill(adj[0], adj[504]+505, -1);
    for (int i=0;i<(int)u.size();i++) adj[u[i]][v[i]] = i;

    vector<pair<int, int>> v1;
    vector<int> Q;
    for (int i=2;i<n;i++) Q.push_back(adj[1][i]);
    int mn = INF;
    for (int i=1;i<n;i++){
        Q.push_back(adj[0][i]);
        v1.emplace_back(i, count_common_roads(Q));
        Q.pop_back();
        mn = min(mn, v1.back().second);
    }

    int cnt = 0;
    for (auto &p:v1) if (p.second==mn) cnt++;

    vector<int> ans;
    for (auto &p:v1) if (cnt==n-1 || p.second!=mn){
        chk[p.first] = 1;
        ans.push_back(adj[0][p.first]);
    }

    //for (int i=1;i<n;i++) printf("%d ", chk[i]);
    //printf("\n");

    for (int i=1;i<n;i++){
        int prv = i;
        while(calc(i, prv+1, n-1) > 0){
            //printf("YES: %d\n", i);
            int l = prv+1, r = n-1;
            while(r-l > 0){
                int m = (l+r)>>1;
                if (calc(i, l, m) > 0) r = m;
                else l = m+1;
            }
            ans.push_back(adj[i][l]);
            prv = l;
        }
    }
    return ans;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 17
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30