Submission #413747

#	Time	Username	Problem	Language	Result	Execution time	Memory
413747		LastRonin	Seats (IOI18_seats)	C++14	5 / 100	4046 ms	39528 KiB

seats

#include <bits/stdc++.h>
#include "seats.h"
#define ll long long
#define pb push_back
#define si short int
#define f first
#define s second
#define mp make_pair
using namespace std;
const ll N = 1<<20;
const ll big = 1e9;
 
int n, dl;
int h, w;
int ans = 0;
vector<int> R, C; 

struct segsnizu {
	si t[2 * N];
	void upd(int p, si z) {
	    int v = dl + p - 1;
	    t[v] = z; 
	    v >>= 1;
		while(v) {			
			t[v] = max(t[v * 2], t[v * 2 + 1]); 
			v >>= 1;
		}
	}
	si get(int l, int r) {
		l = dl + l - 1, r = dl + r - 1;
		si ans = -30000;
		while(l <= r) {
			if(l&1) ans = max(t[l++], ans);
			if(!(r&1)) ans = max(t[r--], ans);
			l >>= 1, r >>= 1;			
 		}
 		return ans;
	}
} rt[4];
 
void give_initial_chart(int H, int W, vector<int> r, vector<int> c) {
	R = r, C = c;
	n = H*W;
	dl = (1<<(__lg(n - 1) + 1));
	for(int i = 1; i <= n; i++) {
		rt[0].upd(i, r[i - 1]);
		rt[1].upd(i, -r[i - 1]);
		rt[2].upd(i, c[i - 1]);
		rt[3].upd(i, -c[i - 1]);
	}
}
 
int swap_seats(int a, int b) {	
	swap(R[a], R[b]), swap(C[a], C[b]);
	rt[0].upd(a + 1, R[a]), rt[0].upd(b + 1, R[b]);
	rt[1].upd(a + 1, -R[a]), rt[1].upd(b + 1, -R[b]);
	rt[2].upd(a + 1, C[a]), rt[2].upd(b + 1, C[b]);
	rt[3].upd(a + 1, -C[a]), rt[3].upd(b + 1, -C[b]);
	int ans = 0;
	for(int i = 1; i <= n;) {
		int k = (rt[0].get(1, i) + rt[1].get(1, i) + 1) * (rt[2].get(1, i) + rt[3].get(1, i) + 1) - i;
		if(k == 0)
			ans++, k = 1;
		i += k;				
	}
	return ans;
}

/* 
int main() {
	int n, m, q;
	cin >> n >> m >> q;
	vector<int> rr, cc;
	for(int i = 1, a, b; i <= n*m; i++)
		cin >> a >> b, rr.pb(a), cc.pb(b);
	give_initial_chart(n, m, rr, cc);
	while(q--) {
		ll a, b;
		cin >> a >> b;
		cout << swap_seats(a, b) << "\n";
	}
}
*/    

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