oj.uz

답안 #635681

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
635681 2022-08-26T16:15:46 Z jhnah917 Through Another Maze Darkly (CCO21_day1problem3) C++14
4 / 25
 92 ms 46732 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr int SZ = 1 << 21;

int N, Q, On[808080], R[808080], T[SZ<<1];
vector<int> G[80808];
vector<pair<int,int>> Tour;
vector<int> Idx[808080]; // Idx[t] : t에 켜지는 정점

void Add(int x, int v){
    for(x|=SZ; x; x>>=1) T[x] += 1;
}
int Kth(int k){
    int x = 1;
    while(x < SZ){
        if(k <= T[x<<1]) x = x << 1;
        else k -= T[x<<1], x = x << 1 | 1;
    }
    return x ^ SZ;
}

inline void AddEdge(int s, int e){
    Idx[max(On[s], On[e])].push_back(Tour.size());
    Tour.emplace_back(s, e);
}

void DFS(int v, int b=-1, int t=1){
    On[v] = t;
    bool flag = false;
    for(auto i : G[v]){
        if(i == b) flag = true;
        else if(flag) On[i] = t + 1, AddEdge(v, i), DFS(i, v, t+1), AddEdge(i, v);
    }
    for(auto i : G[v]){
        if(i == b) break;
        else On[i] = t, AddEdge(v, i), DFS(i, v, t), AddEdge(i, v);
    }
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    cin >> N >> Q;
    for(int i=1; i<=N; i++){
        int sz; cin >> sz; G[i].resize(sz);
        for(auto &j : G[i]) cin >> j;
        rotate(G[i].begin(), G[i].begin()+1, G[i].end());
    }
    DFS(1);

    vector<pair<ll,ll>> V(Q);
    for(int i=0; i<Q; i++) cin >> V[i].first, V[i].second = i + 1;
    sort(V.begin(), V.end());

    ll now = 0;
    for(int i=0, j=1; i<V.size(); i++){
        for(; j<=N && now<V[i].first; j++){
            for(auto e : Idx[j]) Add(e, 1);
            now += T[1];
        }
        ll k = V[i].first - (now - T[1]);
        R[V[i].second] = Kth((k - 1) % (2*N-2) + 1);
    }
    for(int i=1; i<=Q; i++) cout << Tour[R[i]].second << "\n";
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:56:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for(int i=0, j=1; i<V.size(); i++){
      |                       ~^~~~~~~~~

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 21204 KB Output is correct
2 Correct 19 ms 23836 KB Output is correct
3 Incorrect 92 ms 46732 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 21332 KB Output is correct
2 Correct 13 ms 21368 KB Output is correct
3 Correct 12 ms 21460 KB Output is correct
4 Correct 12 ms 21444 KB Output is correct
5 Correct 16 ms 21460 KB Output is correct
6 Correct 16 ms 21460 KB Output is correct
7 Correct 12 ms 21460 KB Output is correct
8 Correct 16 ms 21460 KB Output is correct
9 Correct 13 ms 21588 KB Output is correct
10 Correct 13 ms 21588 KB Output is correct
11 Correct 13 ms 21628 KB Output is correct
12 Correct 13 ms 21716 KB Output is correct
13 Correct 12 ms 21716 KB Output is correct
14 Correct 13 ms 21588 KB Output is correct

Subtask #3
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 22432 KB Output is correct
2 Correct 37 ms 27128 KB Output is correct
3 Incorrect 80 ms 36096 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 21204 KB Output is correct
2 Correct 19 ms 23836 KB Output is correct
3 Incorrect 92 ms 46732 KB Output isn't correct
4 Halted 0 ms 0 KB -