제출 #56532

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
56532		luciocf	Watching (JOI13_watching)	C++14	50 / 100	1044 ms	32852 KiB

watching

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 2010;

typedef long long ll;

ll n, p, q;
ll num[MAXN];
ll dp[MAXN][MAXN];

ll busca2(ll k)
{
    if (k > num[n]) return n;

    ll ini = 1LL, fim = n, ans;
    while (ini <= fim)
    {
        int mid = (ini+fim)>>1;

        if (num[mid] <= k) ans = mid, ini = mid+1;
        else fim = mid-1;
    }
    return ans;
}


bool ok(ll w)
{
    memset(dp, 0LL, sizeof dp);
    for (int i = 1; i <= p; i++)
        for (int j = 1; j <= q; j++)
            dp[i][j] = 1LL;

    for (int i = 0; i <= p; i++)
    {
        for (int j = 0; j <= q; j++)
        {
            if (i)
                dp[i][j] = max(dp[i][j], busca2(num[min(n, dp[i-1][j]+1)]+w-1LL));
            if (j)
                dp[i][j] = max(dp[i][j], busca2(num[min(n, dp[i][j-1]+1)]+2LL*w-1LL));
        }
    }
    return (dp[p][q] >= n);
}

ll busca(void)
{
    ll ini = 1, fim = 1e9+10, ans;
    while (ini <= fim)
    {
        ll mid = (ini+fim)>>1;

        if (ok(mid)) ans = mid, fim = mid-1;
        else ini = mid+1;
    }
    return ans;
}

int main(void)
{
    ios_base::sync_with_stdio(false); cin.tie(0);

    cin >> n >> p >> q;

    for (int i = 1; i <= n; i++) cin >> num[i];

    if (p+q >= n)
    {
        cout << "1\n";
        return 0;
    }

    sort(num+1, num+n+1);
    cout << busca() << "\n";
}

컴파일 시 표준 에러 (stderr) 메시지

watching.cpp: In function 'll busca2(ll)':
watching.cpp:17:28: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
     ll ini = 1LL, fim = n, ans;
                            ^~~
watching.cpp: In function 'bool ok(ll)':
watching.cpp:17:28: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
watching.cpp:17:28: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
watching.cpp: In function 'll busca()':
watching.cpp:59:12: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return ans;
            ^~~

• Subtask 1: 50 / 50
• Subtask 2: 0 / 50