Submission #1084848

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084848		fyan	Aliens (IOI16_aliens)	C++14	25 / 100	179 ms	126036 KiB

aliens

#include "bits/stdc++.h"
using namespace std;
#define i64 int64_t
#define all(x) begin(x), end(x)
#define sz(x) (int) (x).size()

const int MXN=4e3+5, INF=1e9;
int N,M,K;
array<int,2> arr[MXN];
i64 dp[MXN][MXN];

bool cc1(const array<int,2> &a, const array<int,2> &b) {
	if (a[0]==b[0]) {
		return a[1]>b[1];
	}
	return a[0]<b[0];
}
bool cc2(const array<int,2> &a, const array<int,2> &b) {
	return a[1]<b[1];
}


i64 take_photos(int n, int m, int k, vector<int> r, vector<int> c) {
	N = n, M = m, K = min(k,N);
	for (int i=1; i<=N; i++) {
		arr[i] = {min(r[i-1],c[i-1]),max(r[i-1],c[i-1])};
	}
	arr[0] = {-INF,-INF};
	sort(arr,arr+N+1,cc1);
	int pv = 0,sub = 0;
	for (int i=1; i<=N; i++) {
		if (arr[pv][1] >= arr[i][1]) {
			sub++; arr[i] = {INF,INF};
		} else pv = i;
	}
	sort(arr,arr+1+N,cc2);
	N -= sub; K = min(K,N);
	memset(dp,0x3f,sizeof(dp));
	dp[0][0] = 0;

	for (int i=1; i<=N; i++) {
		for (int j=1; j<=K; j++) {
			for (int p=0; p<i; p++) {
				i64 area = (arr[i][1]-arr[p+1][0]+1)*(arr[i][1]-arr[p+1][0]+1);
				i64 dif = 1ll*max(0,arr[p][1]-arr[p+1][0]+1)*max(0,arr[p][1]-arr[p+1][0]+1);
				area -= dif;
				dp[i][j] = min(dp[i][j],dp[p][j-1]+area);
			}
		}
	}
	return dp[N][K];
}
/*
signed main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);
	
	int a,b,c; cin>>a>>b>>c;
	vector<int> x(a),y(a);
	for (int i=0; i<a; i++) {
		cin>>x[i]>>y[i];
	}
	cout<<take_photos(a,b,c,x,y);
	
	return 0;
}
*/

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40