Submission #851104

#	Time	Username	Problem	Language	Result	Execution time	Memory
851104		1zaid1	Meetings (JOI19_meetings)	C++17	7 / 100	2 ms	1112 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>
using namespace std;
mt19937 mt(time(0));
const int M = 2005;
vector<int> sub[M];
int p[M];
void solve(int a) {
    vector<int> v;
    swap(v, sub[a]);
    int n = v.size();
    if (!n) return;

    int b = v[0];
    vector<int> nxt = {a, b};
    for (int i:v) {
        if (i == a || i == b) continue;

        int x = Query(a, b, i);
        if (x == i) nxt.push_back(i);
        else sub[x].push_back(i), p[i] = x;
    }

    sort(nxt.begin(), nxt.end(), [a](int x, int y) {
        if (x == a) return true;
        if (y == a) return false;
        return Query(a, x, y) == x;
    });

    for (int i = 1; i < nxt.size(); i++) p[nxt[i]] = nxt[i-1];
    for (int i:nxt) solve(i);
}

void Solve(int n) {
    vector<int> v;
    int m = mt()%n;
    for (int i = 0; i < n; i++) if (i != m) v.push_back(i);
    sort(v.begin(), v.end(), [](int a, int b) {return mt()%2;});
    sub[m] = v;
    p[m] = m;
    solve(m);
    for (int i = 0; i < n; i++) {
        if (i != p[i]) Bridge(min(p[i], i), max(p[i], i));
    }
}

Compilation message (stderr)

meetings.cpp: In function 'void solve(int)':
meetings.cpp:30:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     for (int i = 1; i < nxt.size(); i++) p[nxt[i]] = nxt[i-1];
      |                     ~~^~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 12
• Subtask 4: 0 / 71