Submission #761770

#	Time	Username	Problem	Language	Result	Execution time	Memory
761770		Dan4Life	Aliens (IOI16_aliens)	C++17	0 / 100	0 ms	212 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>;
vector<ar> v,w;
 
int diag(int i){ return v[i][0]-v[i][1]; }
ll sq(ll x){return x*x;}

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