Submission #958049

#	Time	Username	Problem	Language	Result	Execution time	Memory
958049		Lalic	Aliens (IOI16_aliens)	C++17	25 / 100	82 ms	2652 KiB

aliens

#include "aliens.h"
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define allr(x) x.rbegin(), x.rend()
#define mp make_pair

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5+10;
const int MOD = 1e9+7;
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;

ll take_photos(int n, int m, int k, vector<int> r, vector<int> c) {
    vector<pll> interv;
    for(int i=0;i<n;i++) interv.pb({r[i], c[i]});
    for(int i=0;i<n;i++)
		if(interv[i].fi>interv[i].se) swap(interv[i].fi, interv[i].se);
	
	sort(all(interv), [&](pll a, pll b){ return (a.fi!=b.fi ? a.fi<b.fi : a.se>b.se); });
	
	int last=-1;
	vector<pll> proc; proc.pb({0, 0});
	for(auto u : interv){
		if(u.se<=last) continue;
		proc.pb(u);
		last=u.se;
	}
	
	//ll ans=0;
	//for(auto u : proc) ans+=(u.se-u.fi+1ll)*(u.se-u.fi+1ll);
	//return ans;
	
	n=(int)proc.size()-1;
	
	ll dp[505][505];
	for(int i=0;i<=n;i++)
		for(int j=0;j<=k;j++)
			dp[i][j]=LINF;
	dp[0][0]=0;
	
	for(int i=1;i<=n;i++){
		for(int j=1;j<=k;j++){
			for(int w=0;w<i;w++){
				if(dp[w][j-1]==LINF) continue;
				ll val=dp[w][j-1]+(proc[i].se-proc[w+1].fi+1ll)*(proc[i].se-proc[w+1].fi+1ll);
				if(w) val-=max(proc[w].se-proc[w+1].fi+1ll, 0ll)*(proc[w].se-proc[w+1].fi+1ll);
				dp[i][j]=min(dp[i][j], val);
			}
		}
	}
	
	ll best=LINF;
	for(int i=0;i<=k;i++) best=min(best, dp[n][i]);
	
	return best;
}

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