제출 #290225

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
290225		shayan_p	Aliens (IOI16_aliens)	C++17	41 / 100	2074 ms	3440 KiB

aliens

#include<bits/stdc++.h>
#include "aliens.h"

#define F first
#define S second
#define PB push_back
#define sz(s) (int(s.size()))
#define bit(n, k) (((n)>>(k)) & 1)

using namespace std;

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

const int maxn = 1e5 + 10, mod = 1e9 + 7;
const ll inf = 1e13 + 10, INF = 1e18;

pll dp[maxn];
int mn[maxn];

ll f(int ln){
    return 1ll * ln * ln;
}
pll solve(vector<pii> &seg, ll c){    
    for(int i = 1; i <= sz(seg); i++){
	int mn = i == sz(seg) ? (seg[i-1].S + 1) : seg[i].F;
	mn = min(mn, seg[i-1].S + 1);
	dp[i] = {INF, INF};
	for(int j = 0; j < i; j++){
	    dp[i] = min(dp[i], (pll){ dp[j].F + f(seg[i-1].S - seg[j].F + 1) - f(seg[i-1].S - mn + 1) + c, dp[j].S + 1 });
	}
    }
    return dp[sz(seg)];
}
ll take_photos(int m, int n, int k, vector<int> X, vector<int> Y){
    vector<pii> _seg, seg;
    for(int i = 0; i < m; i++){
	if(X[i] > Y[i])
	    swap(X[i], Y[i]);
	_seg.PB({X[i], Y[i]});
    }
    sort(_seg.begin(), _seg.end());
    for(pii p : _seg){
	if(seg.empty() || seg.back().S < p.S)
	    seg.PB(p);
    }
    
    ll l = -1, r = inf;
    while(r-l > 1){
	ll mid = (l+r) >> 1;
	pll p = solve(seg, mid);
	if(p.S > k)
	    l = mid;
	else
	    r = mid;
    }
    pll p = solve(seg, r);
    return 1ll * p.F - 1ll * k * r;
}

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