Submission #1153454

#	Time	Username	Problem	Language	Result	Execution time	Memory
1153454		brover29	Triple Jump (JOI19_jumps)	C++20	46 / 100	4085 ms	94388 KiB

jumps

#include <bits/stdc++.h>
//qwerty47924692
using namespace std;
using ll = long long;
const ll N=5e5+29;
const string br="617283";
#define sz(a)(ll)a.size()
#define f first
#define s second
ll n,q,w[N],st[N][20],lg[N],l[N],r[N];
void build(){
    lg[1]=0;
    for(ll i=2;i<=n;i++)lg[i]=lg[i/2]+1;
    for(ll j=1;j<20;j++){
        ll k=(1ll<<j);
        for(ll i=k-1;i<=n;i++){
            st[i][j]=max(st[i][j-1],st[i-k/2][j-1]);
        }
    }
}
ll get(ll l,ll r){
    if(l>r)return -1e18;
    ll k=lg[r-l+1];
    return max(st[r][k],st[l+(1ll<<k)-1][k]);
}ll s[N],sz=0;
ll check(ll a,ll b,ll r){
    ll x=b-a;
    return w[a]+w[b]+get(b+x,r);
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin>>n;
    for(ll i=1;i<=n;i++){
        cin>>w[i];
        st[i][0]=w[i];
    }ll q;
    cin>>q;
    build();
    for(ll i=1;i<=n;i++){
        while(sz&&w[s[sz]]<=w[i]){
            sz--;
        }
        l[i]=s[sz];
        s[++sz]=i;
    }
    sz=0;
    s[sz]=n+1;
    for(ll i=n;i>=1;i--){
        while(sz&&w[s[sz]]<w[i]){
            sz--;
        }
        r[i]=s[sz];
        s[++sz]=i;
    }
    while(q--){
        ll L,R,ans=0;
        cin>>L>>R;
        for(ll i=L;i<=R-1;i++){
            ans=max(ans,check(i,r[i],R));

            if(L<=l[i])ans=max(ans,check(l[i],i,R));
        }
        cout<<ans<<'\n';
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 0 / 54