Submission #282048

#	Time	Username	Problem	Language	Result	Execution time	Memory
282048		doowey	Seats (IOI18_seats)	C++14	37 / 100	4040 ms	119340 KiB

seats

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

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair

const int M = (int)2e6 + 10;
int cur;
int pi[M], pj[M];
vector<vector<int>> tt;

struct Node{
    int val;
    int cnt;
    int lazy;
};

Node T[M * 4 + 512];

void push(int node, int cl, int cr){
    T[node].val += T[node].lazy;
    if(cl != cr){
        T[node * 2].lazy += T[node].lazy;
        T[node * 2 + 1].lazy += T[node].lazy;
    }
    T[node].lazy = 0;
}

void upd(int node, int cl, int cr, int tl, int tr, int x){
    push(node, cl, cr);
    if(cr < tl || cl > tr || tl > tr) return;
    if(cl >= tl && cr <= tr){
        T[node].lazy = x;
        push(node, cl, cr);
        return;
    }
    int mid = (cl + cr) / 2;
    upd(node * 2, cl, mid, tl, tr, x);
    upd(node * 2 + 1, mid + 1, cr, tl, tr, x);
    if(T[node * 2].val == T[node * 2 + 1].val){
        T[node].val = T[node * 2].val;
        T[node].cnt = T[node * 2].cnt + T[node * 2 + 1].cnt;
    }
    else if(T[node * 2].val < T[node * 2 + 1].val){
        T[node].val = T[node * 2].val;
        T[node].cnt = T[node * 2].cnt;
    }
    else{
        T[node].val = T[node * 2 + 1].val;
        T[node].cnt = T[node * 2 + 1].cnt;
    }
}

void upd_rect(int i, int j, int v){
    vector<int> tc;
    for(int p = 0; p < 2; p ++ ){
        for(int q = 0; q < 2; q ++ ){
            tc.push_back(tt[i + p][j + q]);
        }
    }
    sort(tc.begin(), tc.end());
    upd(1, 0, cur - 1, tc[0], tc[1] - 1, v);
    upd(1, 0, cur - 1, tc[2], tc[3] - 1, 4 * v);
}

void build(int node, int cl, int cr){
    if(cl == cr){
        T[node].cnt = 1;
        return;
    }
    int mid = (cl + cr) / 2;
    build(node * 2, cl, mid);
    build(node * 2 + 1, mid + 1, cr);
    T[node].cnt = T[node * 2].cnt + T[node * 2 + 1].cnt;
}


void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
    cur = H * W;
    tt.resize(H + 2);
    for(int i = 0 ; i <= H + 1;i ++ )
        tt[i].resize(W + 2, cur);
    for(int i = 0 ; i < cur ;i ++ ){
        R[i] ++ ;
        C[i] ++ ;
        pi[i] = R[i];
        pj[i] = C[i];
        tt[R[i]][C[i]] = i;
    }
    build(1, 0, cur - 1);
    for(int i = 0 ; i <= H; i ++ ){
        for(int j = 0 ; j <= W; j ++ ){
            upd_rect(i, j, +1);
        }
    }
}

int swap_seats(int a, int b) {
    vector<pii> imp;
    for(int i = -1; i <= 0; i ++ ){
        for(int j = -1; j <= 0 ; j ++ ){
            imp.push_back(mp(pi[a] + i, pj[a] + j));
            imp.push_back(mp(pi[b] + i, pj[b] + j));
        }
    }
    sort(imp.begin(), imp.end());
    imp.resize(unique(imp.begin(), imp.end()) - imp.begin());
    for(auto x : imp)
        upd_rect(x.fi, x.se, -1);
    swap(tt[pi[a]][pj[a]], tt[pi[b]][pj[b]]);
    swap(pi[a], pi[b]);
    swap(pj[a], pj[b]);
    for(auto x : imp)
        upd_rect(x.fi, x.se, +1);
    return T[1].cnt;
}

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