oj.uz

답안 #1008814

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1008814 2024-06-26T20:04:43 Z gustavo_d 열대 식물원 (Tropical Garden) (IOI11_garden) C++17
100 / 100
 3673 ms 36680 KB 
// https://oj.uz/problem/view/IOI11_garden > p326
#include "garden.h"
#include "gardenlib.h"
#include <bits/stdc++.h>
using namespace std;

const int MAXN = 150000;
const int MAXLOG = 30;
const int MAXM = 150000;

vector<vector<int>> adj;
int pai[2*MAXN];
vector<int> pai_inv[2*MAXN];
bool in_cycle[2*MAXN];
int cycle_pai[2*MAXN];
int nivel[2*MAXN];
int cycle_sz[2*MAXN];
int in_grau[2*MAXN];
int state[2*MAXN];
int cycle_idx[2*MAXN];
int idx_in_cycle[2*MAXN];
bool mark[2*MAXN];
int qty_cycles = 0;

int n, m;

void map_cycle(int src) {
  int cycle_id = qty_cycles++;
  int v = src;
  int v_idx_in_cycle = 0;
  while (state[v] == 0) {
    state[v] = 2;
    in_cycle[v] = true;
    cycle_pai[v] = v;
    nivel[v] = 0;
    cycle_idx[v] = cycle_id;
    idx_in_cycle[v] = v_idx_in_cycle;
    cycle_sz[cycle_id]++;

    v = pai[v];
    v_idx_in_cycle++;
  }
}

void top_sort() {
  queue<int> rm; vector<int> top_order;
  for (int i=0; i<2*n; i++) {
    if (in_grau[i] == 0) rm.push(i);
  }

  while (!rm.empty()) {
    int v = rm.front(); rm.pop();
    top_order.push_back(v);
    in_grau[pai[v]]--;
    if (in_grau[pai[v]] == 0) rm.push(pai[v]);

    state[v] = 3; in_cycle[v] = false;
  }

  for (int i=0; i<2*n; i++) {
    if (state[i] == 0) {
      map_cycle(i);
    }
  }

  for (int i=(int)top_order.size()-1; i>=0; i--) {
    int v = top_order[i];
    cycle_pai[v] = cycle_pai[pai[v]];
    nivel[v] = nivel[pai[v]]+1;
    cycle_idx[v] = cycle_idx[pai[v]];
    idx_in_cycle[v] = -1;
  }
}

pair<int,int> calc_pai(pair<int,int> u) {
  int e = 0;
  if (u.second == 1 and (int)adj[u.first].size() > 1) { // já veio de grande
    e = 1;
  }
  int v = adj[u.first][e];
  bool is_v_biggest = false;
  if (adj[v][0] == u.first) is_v_biggest = true;
  return {v, is_v_biggest};
};

int cycle_dist(int u, int v) { // u até v
  int sz = cycle_sz[cycle_idx[u]];
  int idx_u = idx_in_cycle[u];
  int idx_v = idx_in_cycle[v];
  if (idx_u <= idx_v) return idx_v - idx_u;
  else return (sz - idx_u + idx_v);
}

void BFS(int src, int nivel_target) {
  bool vis[2*n];
  for (int i=0; i<2*n; i++) vis[i] = false;
  queue<int> visit;
  vis[src] = true;
  visit.push(src);
  while (!visit.empty()) {
    int v = visit.front(); visit.pop();
    if (nivel[v] == nivel_target and (v&1)==0) {
      mark[v] = true;
      continue;
    }
    for (int viz : pai_inv[v]) {
      if (vis[viz]) continue;
      vis[viz] = true;
      visit.push(viz);
    }
  }
}

void mark_ans(int dest, int steps) {
  if (in_cycle[dest]) {
    for (int i=0; i<2*n; i++) {
      if (i & 1) continue;
      if (cycle_idx[i] != cycle_idx[dest]) continue;
      int first = nivel[i] + cycle_dist(cycle_pai[i], dest);
      if (steps < first) continue;
      if (((steps - first) % cycle_sz[cycle_idx[dest]]) == 0) {
        mark[i] = true;
      }
    }
  } else {
    BFS(dest, steps+nivel[dest]);
  }
}

void count_routes(int N, int M, int P, int R[][2], int Q, int G[])
{
  /*
  • P – destino que conta se chegar
  • R[M][2] – arestas ordenadas de forma decrescente pela beleza (são distintas)
  • G[Q] qnts arestas cada grupo passará.
  */

  n = N; m = M;
  for (int i=0; i<2*n; i++) {
    pai_inv[i].clear();
    in_grau[i] = 0;
    state[i] = 0;
    cycle_sz[i] = 0;
  }
  adj = vector<vector<int>>(n);
  qty_cycles = 0;
  
  for (int e=0; e<m; e++) {
    // já ficam ordenadas
    int u = R[e][0], v = R[e][1];
    adj[u].push_back(v);
    adj[v].push_back(u);
  }

  for (int i=0; i<n; i++) {
    for (int stat=0; stat<=1; stat++) {
      int idx = 2*i + stat;
      pair<int,int> pai_aux = calc_pai({i, stat});
      pai[idx] = 2*pai_aux.first + pai_aux.second;
      in_grau[pai[idx]]++;
      pai_inv[pai[idx]].push_back(idx);
    }
  }

  top_sort();

  for(int g=0; g<Q; g++) {
    // quantos lugares saem e chegam em P
    int ans = 0;
    mark_ans(2*P, G[g]);
    mark_ans(2*P+1, G[g]);
    for (int i=0; i<2*n; i++) {
      ans += mark[i];
      mark[i] = false;
    }
    answer(ans);
  }
}

Subtask #1
49.0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7516 KB Output is correct
2 Correct 3 ms 7516 KB Output is correct
3 Correct 3 ms 7516 KB Output is correct
4 Correct 3 ms 7516 KB Output is correct
5 Correct 3 ms 7516 KB Output is correct
6 Correct 3 ms 7580 KB Output is correct
7 Correct 3 ms 7516 KB Output is correct
8 Correct 3 ms 7516 KB Output is correct
9 Correct 4 ms 7776 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7516 KB Output is correct
2 Correct 3 ms 7516 KB Output is correct
3 Correct 3 ms 7516 KB Output is correct
4 Correct 3 ms 7516 KB Output is correct
5 Correct 3 ms 7516 KB Output is correct
6 Correct 3 ms 7580 KB Output is correct
7 Correct 3 ms 7516 KB Output is correct
8 Correct 3 ms 7516 KB Output is correct
9 Correct 4 ms 7776 KB Output is correct
10 Correct 3 ms 7516 KB Output is correct
11 Correct 10 ms 11612 KB Output is correct
12 Correct 21 ms 14212 KB Output is correct
13 Correct 27 ms 23856 KB Output is correct
14 Correct 75 ms 31168 KB Output is correct
15 Correct 76 ms 31496 KB Output is correct
16 Correct 59 ms 24272 KB Output is correct
17 Correct 49 ms 21776 KB Output is correct
18 Correct 20 ms 14288 KB Output is correct
19 Correct 95 ms 31220 KB Output is correct
20 Correct 80 ms 31428 KB Output is correct
21 Correct 63 ms 24296 KB Output is correct
22 Correct 54 ms 21764 KB Output is correct
23 Correct 87 ms 33456 KB Output is correct

Subtask #3
31.0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7516 KB Output is correct
2 Correct 3 ms 7516 KB Output is correct
3 Correct 3 ms 7516 KB Output is correct
4 Correct 3 ms 7516 KB Output is correct
5 Correct 3 ms 7516 KB Output is correct
6 Correct 3 ms 7580 KB Output is correct
7 Correct 3 ms 7516 KB Output is correct
8 Correct 3 ms 7516 KB Output is correct
9 Correct 4 ms 7776 KB Output is correct
10 Correct 3 ms 7516 KB Output is correct
11 Correct 10 ms 11612 KB Output is correct
12 Correct 21 ms 14212 KB Output is correct
13 Correct 27 ms 23856 KB Output is correct
14 Correct 75 ms 31168 KB Output is correct
15 Correct 76 ms 31496 KB Output is correct
16 Correct 59 ms 24272 KB Output is correct
17 Correct 49 ms 21776 KB Output is correct
18 Correct 20 ms 14288 KB Output is correct
19 Correct 95 ms 31220 KB Output is correct
20 Correct 80 ms 31428 KB Output is correct
21 Correct 63 ms 24296 KB Output is correct
22 Correct 54 ms 21764 KB Output is correct
23 Correct 87 ms 33456 KB Output is correct
24 Correct 4 ms 7512 KB Output is correct
25 Correct 193 ms 11612 KB Output is correct
26 Correct 340 ms 15836 KB Output is correct
27 Correct 1071 ms 25232 KB Output is correct
28 Correct 1427 ms 31616 KB Output is correct
29 Correct 1717 ms 31940 KB Output is correct
30 Correct 928 ms 25292 KB Output is correct
31 Correct 1002 ms 22728 KB Output is correct
32 Correct 184 ms 15820 KB Output is correct
33 Correct 1364 ms 31688 KB Output is correct
34 Correct 1681 ms 32052 KB Output is correct
35 Correct 684 ms 25544 KB Output is correct
36 Correct 3673 ms 22728 KB Output is correct
37 Correct 1528 ms 33716 KB Output is correct
38 Correct 3252 ms 36680 KB Output is correct