Submission #1027799

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027799		Issa	Tiles (BOI24_tiles)	C++17	19 / 100	40 ms	27624 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define ent "\n"

const int maxn = 1e6 + 100;
const ll INF = (ll)1e18 + 100;
const int inf = 1e9 + 100;
const int MOD = 1e9 + 123;
const int maxl = 26;
const int P = 31;

int n, m;
int a[maxn];
int b[maxn];
int c[1010][1010];

void test(){
	cin >> n >> m;
	for(int i = 1; i <= n; i++){
		cin >> a[i] >> b[i];
	}
	for(int i = 1; i <= n; i++){
		int j = i - 1;
		if(!j) j = n;
		if(a[i] == a[j]){
			int l = min(b[i], b[j]);
			int r = b[i] + b[j] - l;
			for(int y = l; y < r; y++){
				c[a[i]][y] ^= 1;
			}
		}
	}
	for(int i = 0; i < m; i++){
		for(int j = 0; j <= 1000; j++){
			if(i) c[i][j] ^= c[i-1][j];
		}
	}
	int ans = 0;
	for(int i = 0; i < m; i++){
		int ok = 0;
		for(int j = 0; j <= 1000; j++){
			if(c[i][j]){
				ok = 1;
				if(c[i+1][j] && c[i][j+1] && c[i+1][j+1]){
					c[i][j] = 0;
					c[i+1][j] = 0;
					c[i][j+1] = 0;
					c[i+1][j+1] = 0;
				} else{
					ok = 2;
					break;
				}
			}
		}
		if(ok == 2) break;
		if(ok == 1) continue;
		ans = i + 1;
	}
	cout << ans;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int t; t = 1;
    while(t--) test();
    cout << ent;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 9
• Subtask 3: 0 / 11
• Subtask 4: 19 / 19
• Subtask 5: 0 / 22
• Subtask 6: 0 / 25
• Subtask 7: 0 / 10