oj.uz

Submission #898017

# Submission time Handle Problem Language Result Execution time Memory
898017 2024-01-04T07:53:17 Z 12345678 Fountain (eJOI20_fountain) C++17
100 / 100
 147 ms 15240 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;
int n, q, w[nx], sz[nx], ans[2*nx], p, x;
vector<pair<int, int>> d[nx];
stack<int> st;

struct segtree
{
    int d[4*nx], lz[4*nx];
    void pushlz(int l, int r, int i)
    {
        if (l==r) return d[i]+=lz[i], lz[i]=0, void();
        lz[2*i]+=lz[i];
        lz[2*i+1]+=lz[i];
        d[i]+=lz[i];
        lz[i]=0;
    }
    void update(int l, int r, int i, int ql, int qr, int vl)
    {
        pushlz(l, r, i);
        if (qr<l||r<ql) return;
        if (ql<=l&&r<=qr) return lz[i]+=vl, pushlz(l, r, i), void();
        int md=(l+r)/2;
        update(l, md, 2*i, ql, qr, vl);
        update(md+1, r, 2*i+1, ql, qr, vl);
        d[i]=max(d[2*i], d[2*i+1]);
    }
    int query(int l, int r, int i, int vl)
    {
        pushlz(l, r, i);
        if (l==r) return l;
        int md=(l+r)/2;
        pushlz(l, md, 2*i);
        pushlz(md+1, r, 2*i+1);
        if (d[2*i]>=vl) return query(l, md, 2*i, vl);
        else return query(md+1, r, 2*i+1, vl);
    }
} s;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>q;
    for (int i=1; i<=n; i++) cin>>w[i]>>sz[i];
    w[n+1]=sz[n+1]=1e9;
    for (int i=1; i<=q; i++) cin>>p>>x, d[p].push_back({x, i});
    for (int i=n+1; i>=1; i--)
    {
        while (!st.empty()&&w[st.top()]<=w[i]) s.update(1, n+1, 1, st.top(), n+1, -sz[st.top()]), st.pop();
        s.update(1, n+1, 1, i, n+1, sz[i]);
        st.push(i);
        for (auto [x, idx]:d[i]) ans[idx]=s.query(1, n+1, 1, x);
    }
    for (int i=1; i<=q; i++) cout<<((ans[i]==n+1)?0:ans[i])<<'\n';
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4576 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 2 ms 4616 KB Output is correct
5 Correct 2 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4580 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 81 ms 12752 KB Output is correct
2 Correct 90 ms 13340 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4576 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 2 ms 4616 KB Output is correct
5 Correct 2 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4580 KB Output is correct
8 Correct 81 ms 12752 KB Output is correct
9 Correct 90 ms 13340 KB Output is correct
10 Correct 2 ms 4696 KB Output is correct
11 Correct 60 ms 9720 KB Output is correct
12 Correct 147 ms 15240 KB Output is correct
13 Correct 135 ms 15188 KB Output is correct
14 Correct 115 ms 14416 KB Output is correct
15 Correct 120 ms 14676 KB Output is correct