제출 #683237

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
683237		Github	구경하기 (JOI13_watching)	C++14	100 / 100	222 ms	15220 KiB

watching

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define speedup ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

int n, p, q;
vector<int> events;

bool simulate(int w){
    int dp[n+1][p+1];
    for (int i = 0; i <= n; i++){
        for (int j = 0; j <= p; j++){
            dp[i][j] = 1e9;
        }
    }
    dp[0][0] = 0;
    int lastp = 1, lastq = 1;
    for (int i = 1; i <= n; i++){
        while (events[i] - events[lastp] >= w){
            lastp++;
        }
        while (events[i] - events[lastq] >= 2*w){
            lastq++;
        }
        for (int j = 0; j <= p; j++){
            dp[i][j] = min(dp[i][j], dp[lastq-1][j]+1);
            if (j > 0){
                dp[i][j] = min(dp[i][j], dp[lastp-1][j-1]);
            }
        }
    }
    int mn = 1e9;
    for (int i = 0; i <= p; i++){
        mn = min(mn, dp[n][i]);
    }
    return (mn <= q);
}

int main(){
    speedup
    int arr[10][10];
    cin >> n >> p >> q;
    if (p+q >= n){
        cout << 1 << endl;
        return 0;
    }
    events.resize(n+1);
    events[0] = 0;
    for (int i = 1; i <= n; i++){
        cin >> events[i];
    }
    sort(events.begin(), events.end());
    int low = 1, high = 1e9, mid, ans = 1e9;
    while (high >= low){
        mid = (high+low)/2;
        if (simulate(mid)){
            ans = mid;
            high = mid-1;
        }else{
            low = mid+1;
        }
    }
    cout << ans << endl;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

watching.cpp: In function 'int main()':
watching.cpp:43:9: warning: unused variable 'arr' [-Wunused-variable]
   43 |     int arr[10][10];
      |         ^~~

• Subtask 1: 50 / 50
• Subtask 2: 50 / 50