Submission #1613138


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
//太特么厉害了,逆天了
//这个也能二分,太巧妙了,
#define MS(a) memset(a,0,sizeof(a))
#define MP make_pair
#define PB push_back
const int INF = 0x3f3f3f3f;
const ll INFLL = 0x3f3f3f3f3f3f3f3fLL;
inline ll read()
{
    ll x=0,f=1;
    char ch=getchar();
    while(ch<'0'||ch>'9')
    {
        if(ch=='-')f=-1;
        ch=getchar();
    }
    while(ch>='0'&&ch<='9')
    {
        x=x*10+ch-'0';
        ch=getchar();
    }
    return x*f;
}
//////////////////////////////////////////////////////////////////////////
const int maxn = 1e5+10;

ll x[maxn],k[maxn];
ll n,a,b;

bool check(ll t)
{
    memcpy(k,x,sizeof(x));
    for(ll i=1; i<=n; i++)
    {
        k[i] -= t*b;
    }
    ll more = (a-b),cnt=0;
    for(ll i=1; i<=n; i++)
    {
        if(k[i]>0) cnt += (k[i]%more==0) ? (k[i]/more) : (k[i]/more+1);
    }
    return cnt <= t;
}

int main()
{
    cin >> n >> a >> b;
    for(int i=1; i<=n; i++)
    {
        x[i] = read();
    }

    ll ans,L=1,R=1e9;
    while(L<=R)
    {
        ll mid = (L+R)/2;
        if(check(mid)) ans=mid,R=mid-1;
        else L=mid+1;
    }

    cout << ans << endl;


    return 0;
}

Submission Info

Submission Time
Task D - Widespread
User yuxiaokang
Language C++14 (GCC 5.4.1)
Score 400
Code Size 1276 Byte
Status AC
Exec Time 43 ms
Memory 1792 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 3
AC × 13
Set Name Test Cases
Sample a01, a02, a03
All a01, a02, a03, b04, b05, b06, b07, b08, b09, b10, b11, b12, b13
Case Name Status Exec Time Memory
a01 AC 3 ms 1024 KB
a02 AC 3 ms 1024 KB
a03 AC 3 ms 1024 KB
b04 AC 3 ms 1024 KB
b05 AC 17 ms 1792 KB
b06 AC 43 ms 1792 KB
b07 AC 27 ms 1792 KB
b08 AC 23 ms 1792 KB
b09 AC 17 ms 1792 KB
b10 AC 15 ms 1792 KB
b11 AC 17 ms 1792 KB
b12 AC 18 ms 1792 KB
b13 AC 35 ms 1792 KB