Submission #117965

#	Time	Username	Problem	Language	Result	Execution time	Memory
117965		Osama_Alkhodairy	Seats (IOI18_seats)	C++17	5 / 100	4105 ms	57004 KiB

seats

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

#pragma GCC optimize("O3")

const int N = 1000001;

struct segment{
    int n, tree[4 * N];
    int inv = 0;
    // inv = 0 -> min
    // inv = 1 -> max
    void resize(int nn, int x){
        n = nn;
        inv = x;
    }
    void update(int l, int r, int node, int ind, int val){
        if(r < l || r < ind || l > ind) return;
        if(l == r){
            tree[node] = val;
            return;
        }
        int mid = (l + r) / 2;
        update(l, mid, 2 * node, ind, val);
        update(mid + 1, r, 2 * node + 1, ind, val);
        tree[node] = min(tree[2 * node], tree[2 * node + 1]);
    }
    void update(int ind, int val){
        if(inv) val *= -1;
        update(0, n - 1, 1, ind, val);
    }
    int query(int l, int r, int node, int s, int e){
        if(r < l || r < s || l > e) return 1e9;
        if(s <= l && r <= e) return tree[node];
        int mid = (l + r) / 2;
        return min(query(l, mid, 2 * node, s, e), query(mid + 1, r, 2 * node + 1, s, e));
    }
    int query(int pref){
        int ret = query(0, n - 1, 1, 0, pref);
        if(inv) ret *= -1;
        return ret;
    }
};

int n, m;
vector <int> x, y;
segment tree[4];

void update(int i){
    tree[0].update(i, x[i]);
    tree[1].update(i, x[i]);
    tree[2].update(i, y[i]);
    tree[3].update(i, y[i]);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
    n = H;
    m = W;
    x = R;
    y = C;
    tree[0].resize(n * m, 0);
    tree[1].resize(n * m, 1);
    tree[2].resize(n * m, 0);
    tree[3].resize(n * m, 1);
    for(int i = 0 ; i < n * m ; i++){
        update(i);
    }
}
int area(int g){
    int mnx = tree[0].query(g);
    int mxx = tree[1].query(g);
    int mny = tree[2].query(g);
    int mxy = tree[3].query(g);
    return (mxx - mnx + 1) * (mxy - mny + 1);
}
int swap_seats(int a, int b) {
    swap(x[a], x[b]);
    swap(y[a], y[b]);
    update(a);
    update(b);
    int ret = 0;
    int cur = 0;
    while(cur < n * m){
        int ar = area(cur);
        if(ar == cur + 1){
            ret++;
            cur++;
        }
        else{
            cur = ar - 1;
        }
    }
    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