oj.uz

답안 #965770

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
965770 2024-04-19T07:09:18 Z vjudge1 Fountain (eJOI20_fountain) C++17
100 / 100
 310 ms 61712 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define pp pair<int,int> 
#define ishowpeed ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
const int MXN = 2e5+5;
int anc[MXN][25],vals[MXN][25];
vector<int> edges[MXN];
int N,Q,D,C,R,V;
vector<pp> v;
void dfs(int u,int f,int depth=0){
    for(auto c:edges[u]){
        if(c == f) continue;
        anc[c][0] = u;
        vals[c][0] = v[c].S;
        dfs(c,u,depth+1);
    }
}
void inianc(){
    for(int i = N+1;i >=1;--i){
        for(int k = 1; k < 20;++k){
            anc[i][k] = anc[anc[i][k-1]][k-1];
            if(i == N+1) vals[i][k] = 1e10;
            else vals[i][k] = vals[anc[i][k-1]][k-1] + vals[i][k-1];
        }
    }
}
int search(int v,int cap){
    int temp = 0;
    for(int i = 19; i >=0;--i){
        if(cap > temp + vals[v][i]){
            // cout << v << ' ' << vals[v][i] << '\n';
            temp += vals[v][i];
            v = anc[v][i];
        }
    }
    return v;
}
signed main(){
    ishowpeed
    cin >> N >> Q;
    v.push_back({0,0});
    for(int i = 0; i < N;++i){
        cin >> D >> C;
        v.push_back({D,C});
    }
    v.push_back({1e10,1e10});
    vector<pp> deq;
    for(int i = 1; i <= N+1;++i){
        while(deq.size() && v[i].F > deq.back().F){
            int u = deq.back().S;
            edges[i].push_back(u);
            edges[u].push_back(i);
            deq.pop_back();
        }
        deq.push_back({v[i].F,i});
    }
    anc[N+1][0] = N+1;
    vals[N+1][0] = 1e10;
    dfs(N+1,N+1);
    inianc();
    while(Q--){
        cin >> R >> V;
        int ret = search(R,V);
        if(ret == N+1) cout << 0 << '\n';
        else cout << ret << '\n';
    }
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 8796 KB Output is correct
2 Correct 2 ms 8852 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8804 KB Output is correct
5 Correct 3 ms 8796 KB Output is correct
6 Correct 2 ms 8796 KB Output is correct
7 Correct 3 ms 8796 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 248 ms 59600 KB Output is correct
2 Correct 212 ms 54988 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 8796 KB Output is correct
2 Correct 2 ms 8852 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8804 KB Output is correct
5 Correct 3 ms 8796 KB Output is correct
6 Correct 2 ms 8796 KB Output is correct
7 Correct 3 ms 8796 KB Output is correct
8 Correct 248 ms 59600 KB Output is correct
9 Correct 212 ms 54988 KB Output is correct
10 Correct 2 ms 8796 KB Output is correct
11 Correct 78 ms 35080 KB Output is correct
12 Correct 310 ms 61712 KB Output is correct
13 Correct 162 ms 56992 KB Output is correct
14 Correct 136 ms 55068 KB Output is correct
15 Correct 109 ms 57084 KB Output is correct