oj.uz

답안 #1028205

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1028205 2024-07-19T15:12:17 Z Dennis_Jason Fountain (eJOI20_fountain) C++17
60 / 100
 578 ms 61780 KB 
#include <bitset>
#include <cmath>
#include <functional>
#include <algorithm>
#include <numeric>
#include <deque>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <limits>
#include <list>
#include <map>
#include <unordered_map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#include <cstring>
#define int long long
#define pb push_back
#define MOD 1000000007
#define NMAX 100001
#define nl '\n'
#define INF 1000000007
#define pii1 pair<int, pair<int,int>>  (1,(1,2));
#define pii pair<int,int>
#define tpl tuple<int,int,int>
using namespace std;
ifstream fin("data.in");
ofstream fout("data.out");
int n,q;
const int L=30;
/*
 * 1: 4 10                    tree
   2: 6 8                       7
   3: 3 5                     5   6
   4: 4 14                  2  4
   5: 10 9                 1     3
   6: 4 20
 *
 */
vector<vector<int>>G(NMAX);
int dim[NMAX],cap[NMAX];
int tata[NMAX][L],vol[NMAX][L];
void dfs(int node,int parent)
{
    tata[node][0]=parent;
    vol[node][0]=cap[parent];
    for(auto x:G[node])
    {
        if(x!=parent)
            dfs(x,node);
    }
}
void precompute()
{
    for(int j=1;j<20;++j)
    {
        for(int i=1;i<=n+1;++i)
        {
            if(tata[i][j-1]!=-1)
            {
                tata[i][j]=tata[tata[i][j-1]][j-1];
                vol[i][j]=vol[tata[i][j-1]][j-1]+vol[i][j-1];
            }
        }
    }
}

int binary_lift(int node,int l)
{
    l-=cap[node];
    for(int i=20;i>=0;--i)
    {
        if(tata[node][i]==-1)
            continue;
        if(vol[node][i]<l) {
            l -= vol[node][i];
            node = tata[node][i];
        }
    }
    return tata[node][0];
}
signed main() {

    cin>>n>>q;
    for(int i=1;i<=n;++i)
    {
        int x,y;
        cin>>x>>y;
        dim[i]=x;
        cap[i]=y;
    }
    cap[n+1]=2000000000;
    stack<pii>s;
    s.push({INF,n+1});
    for(int i=n;i>=1;--i)
    {
        while(s.top().first<=dim[i])
            s.pop();
        G[i].pb(s.top().second);
        G[s.top().second].pb(i);
        s.push({dim[i],i});
    }
    memset(tata,-1,sizeof(tata));
    dfs(n+1,0);
    precompute();
    for(int i=1;i<=q;++i)
    {
        int x,y;
        cin>>x>>y;
        if(y<=cap[x])
        {
            cout<<x<<nl;
        }
        else
        {
            int ans= binary_lift(x,y);
            if(ans==n+1)
                cout<<0<<nl;
            else
                cout<<ans<<nl;
        }
    }


    return 0;
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 26204 KB Output is correct
2 Correct 12 ms 26216 KB Output is correct
3 Correct 11 ms 26456 KB Output is correct
4 Correct 12 ms 26460 KB Output is correct
5 Correct 14 ms 26456 KB Output is correct
6 Correct 14 ms 26460 KB Output is correct
7 Correct 13 ms 26456 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 335 ms 59728 KB Output is correct
2 Correct 376 ms 57168 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 26204 KB Output is correct
2 Correct 12 ms 26216 KB Output is correct
3 Correct 11 ms 26456 KB Output is correct
4 Correct 12 ms 26460 KB Output is correct
5 Correct 14 ms 26456 KB Output is correct
6 Correct 14 ms 26460 KB Output is correct
7 Correct 13 ms 26456 KB Output is correct
8 Correct 335 ms 59728 KB Output is correct
9 Correct 376 ms 57168 KB Output is correct
10 Correct 18 ms 26460 KB Output is correct
11 Correct 218 ms 43244 KB Output is correct
12 Incorrect 578 ms 61780 KB Output isn't correct
13 Halted 0 ms 0 KB -