Submission #75664

#	Time	Username	Problem	Language	Result	Execution time	Memory
75664		Osama_Alkhodairy	Seats (IOI18_seats)	C++17	5 / 100	4045 ms	212128 KiB

seats

#include <bits/stdc++.h>
#include "seats.h"
using namespace std;

const int N = 1000001;

int h, w, n;
vector <int> r, c;
set <int> rs[N], cs[N];

void give_initial_chart(int H, int W, vector <int> R, vector <int> C) {
    h = H;
    w = W;
    r = R;
    c = C;
    n = h * w;
    for(int i = 0 ; i < H * W ; i++){
        rs[r[i]].insert(i);
        cs[c[i]].insert(i);
    }
}
int swap_seats(int a, int b) {
    int ret = 0;

    rs[r[a]].erase(a);
    cs[c[a]].erase(a);
    rs[r[b]].erase(b);
    cs[c[b]].erase(b);
    swap(r[a], r[b]);
    swap(c[a], c[b]);
    rs[r[a]].insert(a);
    cs[c[a]].insert(a);
    rs[r[b]].insert(b);
    cs[c[b]].insert(b);

    set <int> ready;
    for(int i = 0 ; i < h ; i++){
        int cur = *rs[i].begin();
        if(cur > 0) ready.insert(cur - 1);
        ready.insert(cur);
    }
    for(int i = 0 ; i < w ; i++){
        int cur = *cs[i].begin();
        if(cur > 0) ready.insert(cur - 1);
        ready.insert(cur);
    }
    ready.insert(n - 1);
    int mnr = 1e9, mxr = -1, mnc = 1e9, mxc = -1;
    for(auto &i : ready){
        mnr = min(mnr, r[i]);
        mnc = min(mnc, c[i]);
        mxr = max(mxr, r[i]);
        mxc = max(mxc, c[i]);
        if((mxr - mnr + 1) * (mxc - mnc + 1) == i + 1) ret++;
    }
    return ret;
}

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