Submission #1165749

#	Time	Username	Problem	Language	Result	Execution time	Memory
1165749		abcdxyz123	Fish 3 (JOI24_fish3)	C++17	9 / 100	2095 ms	10128 KiB

Main

#include<bits/stdc++.h>
#define ll long long
#define maxn 300005
using namespace std;
int n;
ll d;
ll a[maxn];
ll b[maxn];
ll dif[maxn];
ll sdif[maxn];
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>d;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    for(int i=1;i<n;i++)
    {
        dif[i]=((a[i+1]-a[i])%d+d)%d;
        sdif[i]=sdif[i-1]+dif[i];
    }
    int q;
    cin>>q;
    while(q--)
    {
        int l,r;
        cin>>l>>r;
        int flag=0;
        for(int i=l;i<=r;i++)
        {
            b[i]=(a[i]-sdif[i-1])+(sdif[l-1]-a[l]%d);
            if(b[i]<0)
            {
                flag=1;
                break;
            }
            //cout<<b[i]<<' ';
        }
        //cout<<'\n';
        if(flag)
        {
            cout<<-1<<'\n';
            continue;
        }
        //cout<<'\n';
        int pre=r;
        ll sum=b[r];
        ll ds=0;
        for(int i=r-1;i>=l;i--)
        {
            if(b[i]>=b[pre])
            {
                sum+=b[i];
            }
            else
            {
                //cout<<pre<<' '<<i<<'\n';
                ds+=(sum-(pre-i)*b[pre])/d;
                pre=i;
                sum=b[i];
            }
        }
        //cout<<sum<<' '<<pre<<'\n';
        ds+=(sum-(pre-l+1)*b[pre])/d;
        cout<<ds<<'\n';
    }
}
/*
s[i]=s[i-3]+(a[i-2]-s[i-3])%mod+(a[i-1]-a[i-2])%mod+(a[i]-a[i-1])%mod


s[i]=(a[l])%mod+(a[l+1]-a[l])%mod+...+(a[i]-a[i-1])%mod


(a[i]-sdif[i-1])+(sdif[l-1]-a[l]%d)
*/

• Subtask 1: 9 / 9
• Subtask 2: 0 / 7
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36