Submission #939617

#	Time	Username	Problem	Language	Result	Execution time	Memory
939617		andrei_boaca	Fish 2 (JOI22_fish2)	C++17	25 / 100	1752 ms	3772 KiB

fish2

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
ll n,v[100005],q,s[100005],mars[100005];
int solve(int l,int r)
{
    s[l-1]=0;
    mars[l-1]=0;
    for(int i=l;i<=r;i++)
    {
        s[i]=s[i-1]+v[i];
        mars[i]=0;
    }
    stack<int> coada;
    for(int i=l;i<=r;i++)
    {
        while(!coada.empty()&&v[coada.top()]<v[i])
            coada.pop();
        int st=l-1;
        if(!coada.empty())
            st=coada.top();
        if(s[i-1]-s[st]<v[i])
        {
            mars[st+1]++;
            mars[i]--;
        }
        coada.push(i);
    }
    while(!coada.empty())
        coada.pop();
    for(int i=r;i>=l;i--)
    {
        while(!coada.empty()&&v[coada.top()]<v[i])
            coada.pop();
        int dr=r+1;
        if(!coada.empty())
            dr=coada.top();
        if(s[dr-1]-s[i]<v[i])
        {
            mars[i+1]++;
            mars[dr]--;
        }
        coada.push(i);
    }
    int ans=0;
    for(int i=l;i<=r;i++)
    {
        mars[i]+=mars[i-1];
        if(mars[i]==0)
            ans++;
    }
    return ans;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>v[i];
    cin>>q;
    if(q<=1000)
    {
        while(q--)
        {
            int tip;
            cin>>tip;
            if(tip==1)
            {
                int poz,val;
                cin>>poz>>val;
                v[poz]=val;
            }
            else
            {
                int l,r;
                cin>>l>>r;
                cout<<solve(l,r)<<'\n';
            }
        }
        return 0;
    }
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 12 / 12
• Subtask 4: 0 / 23
• Subtask 5: 0 / 35
• Subtask 6: 0 / 17