제출 #354535

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
354535		Lam_lai_cuoc_doi	Sparklers (JOI17_sparklers)	C++17	0 / 100	1 ms	384 KiB

sparklers

#include <iostream>
#include <cstdio>
#include <cmath>
#include <vector>
#define task ""
using namespace std;
using ll = long long;
using ld = long double;

const int N = 1e5 + 2;
const int Inf = 1e9 + 7;
int n, T, k;
int x[N];

void Read()
{
    cin >> n >> k >> T;
    for (int i = 1; i <= n; ++i)
        cin >> x[i];
}

bool Check(int v)
{
    vector<vector<bool>> dp(n + 5, vector<bool>(n + 5));
    dp[k][k] = 1;
    for (int i = 2; i <= n; ++i)
        for (int j = 1; j <= n - i + 1; ++j)
            if ((dp[j][j + i - 2] || dp[j + 1][j + i - 1]) && 2ll * T * (i - 1) >= ceil((ld)1.0 * (x[j + i - 1] - x[j]) / v))
                dp[j][j + i - 1] = 1;
    return dp[1][n];
}

void Solve()
{
    int l = 0, m, h = 1e9 + 7;
    while (l <= h)
    {
        m = (l + h) / 2;
        if (!Check(m))
            l = m + 1;
        else
            h = m - 1;
    }
    cout << l;
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen(task ".INP", "r"))
    {
        freopen(task ".INP", "r", stdin);
        freopen(task ".OUT", "w", stdout);
    }
    Read();
    Solve();
}

컴파일 시 표준 에러 (stderr) 메시지

sparklers.cpp: In function 'int32_t main()':
sparklers.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   54 |         freopen(task ".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   55 |         freopen(task ".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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• Subtask 2: 0 / 20
• Subtask 3: 0 / 50