oj.uz

답안 #348328

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
348328 2021-01-14T15:56:50 Z milleniumEeee 열대 식물원 (Tropical Garden) (IOI11_garden) C++14
100 / 100
 4109 ms 86236 KB 
/*
ребра как вершины
*/
#include "garden.h"
#include "gardenlib.h"
#include <bits/stdc++.h>
//#include "grader.cpp"
#define pii pair<int, int>
#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define szof(s) (int)s.size()
#define all(s) s.begin(), s.end()
using namespace std;
 
const int MAXN = 300005;
int n, m, q, p;
 
//__________________
vector <pii> edges;
vector <pii> g[MAXN];
vector <int> eg[MAXN]; // edge graph
vector <int> reg[MAXN];
pii from_to[MAXN];
int mn1, mn2;
int pr[MAXN], siz[MAXN];
int lst[MAXN];
bool cycle[MAXN];
vector <int> used(MAXN, false);
int tiktak = 0;
int tin[MAXN], tout[MAXN];
int cycle_root[MAXN];
int dist[MAXN];
int cycle_size[MAXN];
vector <vector<int>> mn_dist;
//__________________
 
int findp(int v) {
  if (v == pr[v]) {
    return v;
  }
  return pr[v] = findp(pr[v]);
}
void unite(int a, int b) {
  a = findp(a);
  b = findp(b);
  if (a == b) {
    return;
  }
  if (siz[a] > siz[b]) {
    swap(a, b);
  }
  pr[a] = b;
  siz[b] += siz[a];
}
bool find_cycle(int v) {
  used[v] = 1;
  for (int to : eg[v]) {
    if (!used[to]) {
      lst[to] = v;
      bool f = find_cycle(to);
      if (f) {
        return true;          
      }
    }
    if (used[to] == 1) {
      int fn = v;
      while (fn != to) {
        cycle[fn] = true;
        fn = lst[fn];
      }
      cycle[to] = true;
      return true;
    }
  }
  used[v] = 2;
  return false;
}
void rev_dfs(int v, int root, int len = 0) {
  tin[v] = ++tiktak;
  cycle_root[v] = root;
  dist[v] = len;
  for (int to : reg[v]) {
    if (!cycle[to]) {
      rev_dfs(to, root, len + 1);
    }
  }
  tout[v] = tiktak;
}
void cycle_dfs(int v, int type, int len = 0) {
  mn_dist[type][v] = len;
  for (int to : eg[v]) {
    if (mn_dist[type][to] == -1) {
      cycle_dfs(to, type, len + 1);
    }
  }
}
bool father(int a, int b) {
  return (tin[a] <= tin[b] && tout[b] <= tout[a]);
}
void calc(vector <int> comp) {
  if (pr[comp[0]] != pr[mn1] && pr[comp[2]] != pr[mn2]) {
    return;
  }
  find_cycle(comp[0]);
  int CYCLE_SIZE = 0;
  for (int el : comp) {
    if (cycle[el]) {
      rev_dfs(el, el);
      CYCLE_SIZE++;
    }
  }
  for (int el : comp) {
    cycle_size[el] = CYCLE_SIZE;
  }
  cycle_dfs(mn1, 1);
  cycle_dfs(mn2, 2);
  for (int type = 1; type <= 2; type++) {
    for (int el : comp) {
      if (cycle[el]) {
        mn_dist[type][el] = (cycle_size[el] - mn_dist[type][el]) % cycle_size[el];
      }
    }
  }
}
void precalc(int sz) {
  mn1 = g[p][0].sc;
  if (szof(g[p]) > 1) {
    mn2 = g[p][1].sc;
  } else {
    mn2 = mn1;
  }
  mn_dist.resize(3);
  for (int i = 1; i <= 2; i++) {
    mn_dist[i].resize(sz, -1);
  }
  for (int i = 0; i < sz; i++) {
    pr[i] = i;
    siz[i] = 1;
    lst[i] = -1;
  }
  
  
  for (int i = 0; i < sz; i++) {
    for (int to : eg[i]) {
      unite(i, to);
      reg[to].pb(i);
    }
  }
  vector <int> comp[MAXN];
  for (int i = 0; i < sz; i++) {
    comp[findp(i)].pb(i);
  }
  for (int i = 0; i < sz; i++) {
    if (!comp[i].empty()) {
      calc(comp[i]);      
    }
  }
}
 
int tp;
bool check(int v, int fn, int k) {
  if (pr[v] != pr[fn]) {
    return 0;
  }
  if (cycle[v] && !cycle[fn]) {
    return 0;
  }
  
  if (!cycle[fn]) {
    if (tin[fn] <= tin[v] && tout[v] <= tout[fn] && dist[v] - dist[fn] == k) {
      return 1;
    }
  } else {
    tp = (fn == mn1 ? 1 : 2);
    assert(cycle_size[cycle_root[v]] > 0);
    if (k - dist[v] - mn_dist[tp][cycle_root[v]] >= 0 &&
    (k - dist[v] - mn_dist[tp][cycle_root[v]]) % cycle_size[cycle_root[v]] == 0) {
      return 1;
    }
  }
  return 0;
}
 
void count_routes(int N, int M, int P, int R[][2], int Q, int G[]) {
  n = N;
  m = M;
  q = Q;
  p = P;
  
  for (int i = 0; i < m; i++) {
    int x = R[i][0];
    int y = R[i][1];
    edges.pb({x, y});
    if (szof(g[x]) < 2) {
      g[x].pb({y, i});
    }
    if (szof(g[y]) < 2) {
      g[y].pb({x, i});
    }
  }
  int cnt = 0;
  for (int v = 0; v < n; v++) {
    for (auto &edge : g[v]) {
      int to = edge.fr, ind = edge.sc;
      from_to[cnt] = {v, to};
      edge.sc = cnt;
      cnt++;
    }
  }
  int sz = 0;
  for (int v = 0; v < n; v++) {
    for (auto edge : g[v]) {
      sz++;
      int to = edge.fr, ind = edge.sc;
      if (szof(g[to]) == 1) {
        eg[ind].pb(g[to][0].sc);
        continue;
      }
      int cur = edge.sc;
      int mn1 = g[to][0].sc;
      int mn2 = g[to][1].sc; 
      int x = from_to[cur].fr, y = from_to[cur].sc;
      int xx = from_to[mn1].fr, yy = from_to[mn1].sc;
      if (x > y) {
        swap(x, y);
      } 
      if (xx > yy) {
        swap(xx, yy);
      }
      if (!(x == xx && y == yy)) {
        eg[ind].pb(mn1);
      } else {
        eg[ind].pb(mn2);
      }
    }
  }
  precalc(sz);
  int ans;
  
  int best[MAXN];
  for (int i = 0; i < n; i++) {
    best[i] = g[i][0].sc;
  }
  
  for (int i = 0; i < q; i++) {
    ans = 0;
    bool ok;
    for (int v = 0; v < n; v++) {
      ok = check(best[v], mn1, G[i]);
      ok |= check(best[v], mn2, G[i]);
      ans += ok;
    }
    answer(ans);
  }
}

Compilation message

garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:206:25: warning: unused variable 'ind' [-Wunused-variable]
  206 |       int to = edge.fr, ind = edge.sc;
      |                         ^~~

Subtask #1
49.0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 30060 KB Output is correct
2 Correct 20 ms 30060 KB Output is correct
3 Correct 19 ms 30060 KB Output is correct
4 Correct 18 ms 29804 KB Output is correct
5 Correct 19 ms 29804 KB Output is correct
6 Correct 20 ms 30188 KB Output is correct
7 Correct 19 ms 29804 KB Output is correct
8 Correct 19 ms 29932 KB Output is correct
9 Correct 22 ms 30188 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 30060 KB Output is correct
2 Correct 20 ms 30060 KB Output is correct
3 Correct 19 ms 30060 KB Output is correct
4 Correct 18 ms 29804 KB Output is correct
5 Correct 19 ms 29804 KB Output is correct
6 Correct 20 ms 30188 KB Output is correct
7 Correct 19 ms 29804 KB Output is correct
8 Correct 19 ms 29932 KB Output is correct
9 Correct 22 ms 30188 KB Output is correct
10 Correct 19 ms 29804 KB Output is correct
11 Correct 38 ms 34920 KB Output is correct
12 Correct 67 ms 39396 KB Output is correct
13 Correct 101 ms 68544 KB Output is correct
14 Correct 181 ms 60508 KB Output is correct
15 Correct 218 ms 61020 KB Output is correct
16 Correct 166 ms 54492 KB Output is correct
17 Correct 146 ms 51548 KB Output is correct
18 Correct 61 ms 39652 KB Output is correct
19 Correct 183 ms 60508 KB Output is correct
20 Correct 237 ms 61916 KB Output is correct
21 Correct 165 ms 54492 KB Output is correct
22 Correct 160 ms 51552 KB Output is correct
23 Correct 202 ms 62044 KB Output is correct

Subtask #3
31.0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 30060 KB Output is correct
2 Correct 20 ms 30060 KB Output is correct
3 Correct 19 ms 30060 KB Output is correct
4 Correct 18 ms 29804 KB Output is correct
5 Correct 19 ms 29804 KB Output is correct
6 Correct 20 ms 30188 KB Output is correct
7 Correct 19 ms 29804 KB Output is correct
8 Correct 19 ms 29932 KB Output is correct
9 Correct 22 ms 30188 KB Output is correct
10 Correct 19 ms 29804 KB Output is correct
11 Correct 38 ms 34920 KB Output is correct
12 Correct 67 ms 39396 KB Output is correct
13 Correct 101 ms 68544 KB Output is correct
14 Correct 181 ms 60508 KB Output is correct
15 Correct 218 ms 61020 KB Output is correct
16 Correct 166 ms 54492 KB Output is correct
17 Correct 146 ms 51548 KB Output is correct
18 Correct 61 ms 39652 KB Output is correct
19 Correct 183 ms 60508 KB Output is correct
20 Correct 237 ms 61916 KB Output is correct
21 Correct 165 ms 54492 KB Output is correct
22 Correct 160 ms 51552 KB Output is correct
23 Correct 202 ms 62044 KB Output is correct
24 Correct 20 ms 29804 KB Output is correct
25 Correct 292 ms 34920 KB Output is correct
26 Correct 432 ms 39396 KB Output is correct
27 Correct 2830 ms 68448 KB Output is correct
28 Correct 2412 ms 60636 KB Output is correct
29 Correct 3457 ms 61020 KB Output is correct
30 Correct 2359 ms 54620 KB Output is correct
31 Correct 2582 ms 51916 KB Output is correct
32 Correct 995 ms 39524 KB Output is correct
33 Correct 2423 ms 60764 KB Output is correct
34 Correct 3359 ms 61276 KB Output is correct
35 Correct 2782 ms 54492 KB Output is correct
36 Correct 2869 ms 51804 KB Output is correct
37 Correct 2171 ms 62428 KB Output is correct
38 Correct 4109 ms 86236 KB Output is correct