Submission #773704

#	Time	Username	Problem	Language	Result	Execution time	Memory
773704		Jomnoi	Aliens (IOI16_aliens)	C++17	12 / 100	128 ms	4148 KiB

aliens

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

const int MAX_K = 1005;
const int MAX_N = 1005;
const long long INF = 1e18 + 7;

int N, M, K;
int X[MAX_N], Y[MAX_N], id[MAX_N];
long long dp[MAX_K][MAX_N];
int qs[MAX_N][MAX_N];
bool dead[MAX_N];

long long take_photos(int n, int m, int k, vector <int> r, vector <int> c) {
    N = n, M = m, K = k;
    for (int i = 0; i < N; i++) {
        X[i] = min(r[i], c[i]), Y[i] = max(r[i], c[i]);
        id[i] = i;
    }

    for (int i = 0; i < N; i++) {
        for (int j = i + 1; j < N; j++) {
            if (X[i] <= X[j] and Y[j] <= Y[i]) dead[j] = true;
            else if (X[j] <= X[i] and Y[i] <= Y[j]) dead[i] = true;
        }
    }
    
    N = 0;
    for (int i = 0; i < n; i++) {
        if (dead[i] == false) {
            X[N] = X[i], Y[N] = Y[i];
            N++;
        }
    }

    sort(id, id + N, [&](const int &a, const int &b) {
        return Y[a] < Y[b];
    });

    for (int i = 1; i <= N; i++) dp[0][i] = INF;
    for (int k = 1; k <= K; k++) {
        for (int i = 1; i <= N; i++) {
            dp[k][i] = INF;

            int minL = M;
            for (int j = i; j >= 1; j--) {
                minL = min(minL, X[id[j - 1]]);
                // cout << minL << ' ' << Y[id[i - 1]] << endl;
                long long cost = (Y[id[i - 1]] - minL + 1) * (Y[id[i - 1]] - minL + 1);
                dp[k][i] = min(dp[k][i], cost + dp[k - 1][j - 1]);
            }
            // cout << k << ' ' << i << " : " << dp[k][i] << endl;
        }
    }

    long long ans = INF;
    for (int k = 1; k <= K; k++) ans = min(ans, dp[k][N]);
    return ans;
}

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