Submission #534803

#	Time	Username	Problem	Language	Result	Execution time	Memory
534803		Paul_Liao_1457	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	0 / 100	1 ms	332 KiB

Main

// 還要更強
#include<iostream>
#include<queue>
#include<set>
#include<map>
#include<iomanip>
#include<math.h>
#include<cstring>
#include<stack>
#include<string.h>
#include<random>
#include<algorithm>
#include<vector>

#define ll long long
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a,b) for(int i=a;i>=b;i--)
#define INF (ll)(2e18)
#define pb push_back
#define AC ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

using namespace std;

ll b[200005],a[200005];
vector<ll> r,l;

signed main(){
    AC;
    bool ok=1;
    int n; cin>>n;
    FOR(i,1,n+1) cin>>a[i];
    FOR(i,1,n+1){
        b[i]=a[i]-a[i-1];
        if(b[i]>=0) r.pb(i);
        else l.pb(i);
        if(b[i]==0) ok=0;
    }
    if(ok&&r[r.size()-1]<l[0]){
        cout<<0<<endl; return 0;
    }
    reverse(l.begin(),l.end());
    ll ans=0;
    FOR(i,2,n+1){
        if(b[i]==0){
            ans++;
            if(r.size()&&l.size()&&r.back()>l.back()){
                if(b[r.back()]==0){
                    r.pop_back();
                }
                b[r.back()]--;
            }
        }
        else if(b[i]<0&&r.size()&&r.back()>i){
            l.pop_back();
            ans+=(1-b[i]);
            if(r.size()&&l.size()&&l.back()<r.back()){
                b[r.back()]-=(1-b[i]);
                if(b[r.back()]<0){
                    r.pop_back();
                }
            }
        }
        //cout<<"i="<<i<<" ans="<<ans<<endl;
    }
    cout<<ans<<endl;
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 60