Submission #580794

#	Time	Username	Problem	Language	Result	Execution time	Memory
580794		definitelynotmee	Seats (IOI18_seats)	C++17	17 / 100	4083 ms	43928 KiB

seats

#include "seats.h"
#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template<typename T>
using matrix = vector<vector<T>>;

vector<pii> v;
int resp = 0;
vector<pii> mini, maxi;
vector<int> isgood;
int n;

void calc(int id, pii nmin, pii nmax){
    resp-=isgood[id];
    isgood[id] = (nmax.ff-nmin.ff+1)*(nmax.ss-nmin.ss+1) == id+1;
    resp+=isgood[id];
    mini[id] = nmin;
    maxi[id] = nmax;
}

void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
    n = H*W;
    v = vector<pii>(n);
    mini = vector<pii>(n);
    maxi = vector<pii>(n);
    isgood = vector<int>(n);
    for(int i = 0; i < n; i++){
        v[i] = {R[i], C[i]};
    }
    calc(0,v[0],v[0]);
    for(int i = 1; i < n; i++){
        pii nmin = mini[i-1], nmax = maxi[i-1];
        nmin.ff = min(nmin.ff,v[i].ff);
        nmin.ss = min(nmin.ss,v[i].ss);
        nmax.ff = max(nmax.ff,v[i].ff);
        nmax.ss = max(nmax.ss,v[i].ss);
        calc(i,nmin,nmax);
    }
}

int swap_seats(int a, int b) {
    if(a > b)
        swap(a,b);
    
    swap(v[a],v[b]);
    if(a == 0){
        mini[a] = v[a];
        maxi[a] = v[a];
        a++;
    }
    for(int i = a; i <= b; i++){
        pii nmin = mini[i-1], nmax = maxi[i-1];
        nmin.ff = min(nmin.ff,v[i].ff);
        nmin.ss = min(nmin.ss,v[i].ss);
        nmax.ff = max(nmax.ff,v[i].ff);
        nmax.ss = max(nmax.ss,v[i].ss);
        calc(i,nmin,nmax);
    }
    return resp;
}

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