Submission #564579

#	Time	Username	Problem	Language	Result	Execution time	Memory
564579		urosk	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++14	100 / 100	1240 ms	107280 KiB

sortbooks

#include <bits/stdc++.h>
#define here cerr<<"------------------------------------\n"
#define ll long long
#define pll pair<ll,ll>
#define all(a) a.begin(),a.end()
#define fi first
#define sc second
#define pb push_back
#define popb pop_back
#define sz(x) (ll)(x.size())
#define llinf 100000000000000LL
#define endl '\n'
#define ceri(a,l,r) {for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
using namespace std;
#define maxn 1000005

ll n,q;
ll a[maxn];
ll b[maxn];
ll t[4*maxn];
ll ans[maxn];
struct upit{
    ll l,r,x,id;
};
bool cmp(upit a,upit b){return a.r<b.r;}
void upd(ll v,ll tl,ll tr,ll i,ll x){
    if(tl==tr){
        t[v] = max(t[v],x);
        return;
    }
    ll mid = (tl+tr)/2;
    if(i<=mid) upd(2*v,tl,mid,i,x);
    else upd(2*v+1,mid+1,tr,i,x);
    t[v] = max(t[2*v],t[2*v+1]);
}
ll get(ll v,ll tl,ll tr,ll l,ll r){
    if(l>r) return 0;
    if(tl==l&&tr==r) return t[v];
    ll mid = (tl+tr)/2;
    return max(get(2*v,tl,mid,l,min(mid,r)),get(2*v+1,mid+1,tr,max(mid+1,l),r));
}
vector<upit> v;
int main(){
    ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
    cin >> n >> q;
    for(ll i = 1;i<=n;i++) cin >> a[i];
    stack<ll> st;
    for(ll i = 1;i<=n;i++){
        while(sz(st)&&a[i]>=a[st.top()]) st.pop();
        if(sz(st)) b[i] = st.top();
        st.push(i);
    }
    for(ll i = 1;i<=q;i++){
        ll l,r,x;
        cin >> l >> r >> x;
        v.pb({l,r,x,i});
    }
    sort(all(v),cmp);
    ll j = 1;
    for(upit p : v){
        ll l = p.l;
        ll r = p.r;
        ll x = p.x;
        ll id = p.id;
        while(j<=r){
            if(b[j]!=0) upd(1,1,n,b[j],a[j] + a[b[j]]);
            j++;
        }
        ans[id] = get(1,1,n,l,r)<=x;
    }
    for(ll i = 1;i<=q;i++) cout<<ans[i]<<endl;
}

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 30 / 30
• Subtask 6: 23 / 23