Submission #761727

#	Time	Username	Problem	Language	Result	Execution time	Memory
761727		Dan4Life	Aliens (IOI16_aliens)	C++17	0 / 100	1 ms	296 KiB

aliens

#include "aliens.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
using ll = long long;
using ar = array<int,2>;

ll take_photos(int n, int m, int k, vector<int> r, vector<int> c) {
	for(int i = 0; i < n; i++)
		if(c[i]-r[i]<0) r[i]=m-r[i]-1,c[i]=m-c[i]-1;
	vector<ar> v,w; set<int> S;
	for(int i = 0; i < n; i++) w.pb({c[i],r[i]});
	sort(begin(w),end(w));
	for(int i = n-1; i >=0; i--){
		if(!sz(S) or *begin(S) > w[i][1]) v.pb(w[i]);
		S.insert(w[i][1]);
	}
	n = sz(v); ll dp[k+1][n+1], ans = (ll)4e18;
	memset(dp,63,sizeof(dp)); dp[0][0] = 0;
	for(int i = 1; i <= n; i++) 
		dp[1][i]=v[i-1][0]-v[0][1]+1,dp[1][i]*=dp[1][i];
	for(int j = 2; j <= k; j++)
		for(int i = 1; i <= n; i++)
			for(int x = 0; x < i; x++)
				dp[i][j] = min(dp[i][j],dp[x][j-1]+
					(v[i-1][0]-v[x][1]+1)*(v[i-1][0]-v[x][1]+1));
	for(int i = 1; i <= k; i++) ans = min(ans, dp[i][n]);
    return ans;
}

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