Submission #214765

#	Time	Username	Problem	Language	Result	Execution time	Memory
214765		SamAnd	Swimming competition (LMIO18_plaukimo_varzybos)	C++17	100 / 100	547 ms	15960 KiB

plaukimo_varzybos

#include <bits/stdc++.h>
using namespace std;
const int N = 1000006;

int n, a, b;
int u[N];

int p[N];
bool dp[N];

bool stg(int x)
{
    dp[0] = true;
    p[0] = 1;
    int j = 1;
    for (int i = 1; i <= n; ++i)
    {
        p[i] = p[i - 1];
        dp[i] = false;
        while ((u[i] - u[j] > x))
            ++j;
        if (i - a < 0)
            continue;
        if (j - 1 <= i - b)
        {
            if (i - b - 1 < 0)
                dp[i] = true;
            else if (p[i - a] - p[i - b - 1] > 0)
                dp[i] = true;
        }
        else
        {
            if (j - 1 <= i - a)
            {
                if (p[i - a] - p[j - 1 - 1] > 0)
                    dp[i] = true;
            }
        }
        if (dp[i])
            ++p[i];
    }
    return dp[n];
}

int main()
{
    scanf("%d%d%d", &n, &a, &b);
    for (int i = 1; i <= n; ++i)
        scanf("%d", &u[i]);
    sort(u + 1, u + n + 1);
    int l = 0, r = N;
    int ans;
    while (l <= r)
    {
        int m = (l + r) / 2;
        if (stg(m))
        {
            ans = m;
            r = m - 1;
        }
        else
            l = m + 1;
    }
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

plaukimo_varzybos.cpp: In function 'int main()':
plaukimo_varzybos.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &n, &a, &b);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
plaukimo_varzybos.cpp:49:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &u[i]);
         ~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40