Submission #294445

#	Time	Username	Problem	Language	Result	Execution time	Memory
294445		zoooma13	Seats (IOI18_seats)	C++14	17 / 100	530 ms	76792 KiB

seats

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

#define MAX_N 1000006
#define pii pair<int ,int>
#define mxp first
#define mip second
#define FL p<<1
#define FR p<<1|1

int n;
int h ,w ,ans;
pii tree[4*MAX_N][2];
vector <int> cor[2] ,sat;
pii mrg(pii x ,pii y){
    return {max(x.mxp ,y.mxp) ,min(x.mip ,y.mip)};
}
void bld(int l=0 ,int r=n-1 ,int p=1){
    if(l == r){
        tree[p][0] = {cor[0][l] ,cor[0][l]};
        tree[p][1] = {cor[1][l] ,cor[1][l]};
        return;
    }
    int mid = (l+r)>>1;
    bld(l ,mid ,FL);
    bld(mid+1 ,r ,FR);
    tree[p][0] = mrg(tree[FL][0] ,tree[FR][0]);
    tree[p][1] = mrg(tree[FL][1] ,tree[FR][1]);
}
void upd(int i ,int l=0 ,int r=n-1 ,int p=1){
    if(l == r){
        tree[p][0] = {cor[0][l] ,cor[0][l]};
        tree[p][1] = {cor[1][l] ,cor[1][l]};
        return;
    }
    int mid = (l+r)>>1;
    if(i <= mid) upd(i ,l ,mid ,FL);
    else         upd(i ,mid+1 ,r ,FR);
    tree[p][0] = mrg(tree[FL][0] ,tree[FR][0]);
    tree[p][1] = mrg(tree[FL][1] ,tree[FR][1]);
}
pair<pii ,pii> qry(int qr ,int l=0 ,int r=n-1 ,int p=1){
    if(qr < l)
        return {{-1e9 ,1e9} ,{-1e9 ,1e9}};
    if(r <= qr)
        return {tree[p][0] ,tree[p][1]};
    int mid = (l+r)>>1;
    auto lf = qry(qr ,l ,mid ,FL);
    auto rt = qry(qr ,mid+1 ,r ,FR);
    return {mrg(lf.first ,rt.first) ,mrg(lf.second ,rt.second)};
}

void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
    n = R.size();
    h = H;
    w = W;
    sat.resize(n);
    cor[0] = R;
    cor[1] = C;
    bld();

    int mxR = 0 ,miR = H;
    int mxC = 0 ,miC = W;
    for(int i=0; i<R.size(); i++){
        mxR = max(mxR ,R[i]);
        miR = min(miR ,R[i]);
        mxC = max(mxC ,C[i]);
        miC = min(miC ,C[i]);
        if((mxR-miR+1)*(mxC-miC+1) == i+1)
            sat[i] = 1 ,ans++;
    }
}

int swap_seats(int a, int b) {
    if(b < a) swap(a ,b);
    swap(cor[0][a] ,cor[0][b]);
    swap(cor[1][a] ,cor[1][b]);
    upd(a) ,upd(b);
    if(abs(b-a) <= 10000){
        auto x = qry(a);
        int mxR = x.first.mxp ,miR = x.first.mip;
        int mxC = x.second.mxp ,miC = x.second.mip;
        for(int i=a; i<=b; i++){
            mxR = max(mxR ,cor[0][i]);
            miR = min(miR ,cor[0][i]);
            mxC = max(mxC ,cor[1][i]);
            miC = min(miC ,cor[1][i]);
            if((mxR-miR+1)*(mxC-miC+1) == i+1){
                if(!sat[i]){ sat[i] = 1 ,ans++; }
            }else{
                if(sat[i]){ sat[i] = 0 ,ans--; }
            }
        }
    }else{

    }
    return ans;
}

Compilation message (stderr)

seats.cpp: In function 'void give_initial_chart(int, int, std::vector<int>, std::vector<int>)':
seats.cpp:65:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |     for(int i=0; i<R.size(); i++){
      |                  ~^~~~~~~~~

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