Submission #819080

#	Time	Username	Problem	Language	Result	Execution time	Memory
819080		vjudge1	Aliens (IOI16_aliens)	C++17	25 / 100	2069 ms	22376 KiB

aliens

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

using namespace std;
using ll = long long;
ll INF = 1e16;

ll take_photos(int n, int m, int K, vector<int> r, vector<int> c) {
    vector<pair<ll, ll>> a, b;
    for(int i = 0; i < n; i++) {
        if(r[i] > c[i]) swap(r[i], c[i]);
        a.push_back({r[i], c[i]});
    }
    sort(a.begin(), a.end());
    ll mx = -1;
    b.push_back({-1, -1});
    for(auto [r, c] : a) {
        if(c <= mx) continue;
        b.push_back({r, c});
        mx = max(mx, c);
    }
    a = b;
    n = (int)a.size() - 1;
    vector<vector<ll>> dp(n + 1, vector<ll>(K + 1, INF));
    dp[0][0] = 0;
    for(int i = 1; i <= n; i++) {
        for(int k = 1; k <= K; k++) {
            for(int j = 0; j < i; j++) {
                ll val = dp[j][k - 1] + (a[i].second - a[j + 1].first + 1) * (a[i].second - a[j + 1].first + 1);
                if(a[j].second >= a[j + 1].first) val -= (a[j].second - a[j + 1].first + 1) * (a[j].second - a[j + 1].first + 1);
                dp[i][k] = min(dp[i][k], val);
            }
        }
    }
    ll res = INF;
    for(int k = 1; k <= K; k++)
        res = min(res, dp[n][k]);
    return res;
}

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