Submission #761799

#	Time	Username	Problem	Language	Result	Execution time	Memory
761799		Dan4Life	Aliens (IOI16_aliens)	C++17	12 / 100	170 ms	2260 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;

ll sq(ll x){return x*x;}

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

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