Submission #835491

#	Time	Username	Problem	Language	Result	Execution time	Memory
835491		mousebeaver	Seats (IOI18_seats)	C++14	17 / 100	4030 ms	66440 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>
#define pii pair<int, int>
using namespace std;

struct inf
{
    int r1;
    int r2;
    int c1;
    int c2;
    bool possible;
};

vector<inf> a(0);
vector<pii> p(0);
int counter = 1;

void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) 
{
    int n = H*W;
    for(int i = 0; i < n; i++)
    {
        p.push_back({R[i], C[i]});
    }

    a = {{p[0].first, p[0].first, p[0].second, p[0].second, true}};
    for(int i = 1; i < n; i++)
    {
        a.push_back(a.back());
        a.back().r1 = min(a.back().r1, p[i].first);
        a.back().r2 = max(a.back().r2, p[i].first);
        a.back().c1 = min(a.back().c1, p[i].second);
        a.back().c2 = max(a.back().c2, p[i].second);
        a.back().possible = ((1+a.back().r2-a.back().r1)*(1+a.back().c2-a.back().c1) == i+1);
        counter += a.back().possible;
    }
}

int swap_seats(int d, int b) 
{
    if(d > b)
    {
        swap(d, b);
    }
    swap(p[d], p[b]);

    for(int i = d; i <= b; i++)
    {
        counter -= a[i].possible;
        if(i == 0)
        {
            a[i] = {p[0].first, p[0].first, p[0].second, p[0].second, true};
        }
        else
        {
            a[i] = a[i-1];
        }
        a[i].r1 = min(a[i].r1, p[i].first);
        a[i].r2 = max(a[i].r2, p[i].first);
        a[i].c1 = min(a[i].c1, p[i].second);
        a[i].c2 = max(a[i].c2, p[i].second);
        a[i].possible = ((1+a[i].r2-a[i].r1)*(1+a[i].c2-a[i].c1) == i+1);
        counter += a[i].possible;
    }

    return counter;
}

• Subtask 1: 5 / 5
• Subtask 2: 6 / 6
• Subtask 3: 0 / 20
• Subtask 4: 6 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30