Submission #1115713

#	Time	Username	Problem	Language	Result	Execution time	Memory
1115713		Tymond	Seats (IOI18_seats)	C++17	11 / 100	4043 ms	40760 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define fi first
#define se second
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::high_resolution_clock::now().time_since_epoch().count());
inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);}
inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);}
#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

vi r;
vi c;
int n, m;

void give_initial_chart(int H, int W, vi R, vi C){
    n = H;
    m = W;
    r = R;
    c = C;
}

int calc(){
    int ans = 1;
    pii x = mp(r[0], r[0]);
    pii y = mp(c[0], c[0]);
    for(int i = 1; i < n * m; i++){
        x.fi = min(x.fi, r[i]);
        x.se = max(x.se, r[i]);
        y.fi = min(y.fi, c[i]);
        y.se = max(y.se, c[i]);
        if((x.se - x.fi + 1) * (y.se - y.fi + 1) == i + 1){
            ans++;
        }
    }
    return ans;
}

int swap_seats(int a, int b) {
    swap(r[a], r[b]);
    swap(c[a], c[b]);

    return calc();
}

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