Submission #1948078

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

#define int long long

#define rep(i,n) for(int i=0;i<(n);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()
#define fi first
#define se second
typedef vector<int>vint;
typedef pair<int,int>pint;
typedef vector<pint>vpint;

template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

int N,H;
int A[111111],B[111111];

signed main(){
    cin>>N>>H;

    rep(i,N)cin>>A[i]>>B[i];
    int x=*max_element(A,A+N);

    sort(B,B+N);reverse(B,B+N);

    int ans=(H+x-1)/x;
    for(int i=0;i<N;i++){
        H-=B[i];
        int tmp;
        if(H<=0)tmp=0;
        else tmp=(H+x-1)/x;
        chmin(ans,i+1+tmp);

    }cout<<ans<<endl;
    return 0;
}

Submission Info

Judge Result