oj.uz

답안 #480079

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
480079 2021-10-14T14:10:45 Z LeMur 경주 (Race) (IOI11_race) C++17
100 / 100
 1366 ms 40940 KB 
///////////////////////////////    _LeMur_
#define _CRT_SECURE_NO_WARNINGS
#include "race.h"
#include <unordered_map>
#include <unordered_set>
#include <algorithm>
#include <iostream>
#include <cstring>
#include <cassert>
#include <chrono>
#include <random>
#include <bitset>
#include <cstdio>
#include <vector>
#include <string>
#include <stack>
#include <queue>
#include <ctime>
#include <cmath>
#include <list>
#include <map>
#include <set>

using namespace std;

const int N = 200005;
const int inf = 1000 * 1000 * 1000;
const int mod = 1000 * 1000 * 1000 + 7;
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());

vector < pair<int, int> > g[N];
int answ = -1;

bool used[N];
int sz[N];
int nn = 0;
int k;

void dfs_sz(int v, int p) {
  nn++;
  sz[v] = 1;
  for (int i = 0; i < (int)g[v].size(); i++) {
    int to = g[v][i].first;
    if (to == p) continue;
    if (used[to]) continue;
    dfs_sz(to, v);
    sz[v] += sz[to];
  }
}

int find_center(int v, int p) {
  int mx_sz = -1, gag;
  for (int i = 0; i < (int)g[v].size(); i++) {
    int to = g[v][i].first;
    if (to == p) continue;
    if (used[to]) continue;
    if (sz[to] > mx_sz) {
      mx_sz = sz[to];
      gag = to;
    }
  }

  if (mx_sz * 2 <= nn) return v;
  return find_center(gag, v);
}

int find_centroid(int v) {
  nn = 0;
  dfs_sz(v, -1);
  int center = find_center(v, -1);
  dfs_sz(center, -1);
  return center;
}

vector < pair<int, int> > mas;
map <int, int> mp;

void update(int &answ, int x) {
  if (answ == -1 || x < answ) {
    answ = x;
  }
}

void solve(int v, int p, int L, int r) {
  if (p != -1) {
    mas.push_back(make_pair(L, r));
  }
  for (int i = 0; i < (int)g[v].size(); i++) {
    int to = g[v][i].first;
    int len = g[v][i].second;
    if (to == p || used[to]) continue;
    solve(to, v, L + len, r + 1);

    if (p == -1) {
      for (int j = 0; j < (int)mas.size(); j++) {
        int L = mas[j].first;
        int d = mas[j].second;
        if (L > k) continue;
        if (L == k) {
          update(answ, d);
        } else {
          if (mp.find(k - L) != mp.end()) {
            update(answ, d + mp[k - L]);
          }
        }
      }

      for (int j = 0; j < (int)mas.size(); j++) {
        int L = mas[j].first;
        int d = mas[j].second;
        if (L > k) continue;
        if (mp.find(L) != mp.end()) {
          mp[L] = min(mp[L], d);
        } else {
          mp[L] = d;
        }
      }
      mas.clear();
    }
  }
}

void centroid_decomposition() {
  queue <int> q;
  q.push(1);

  while (!q.empty()) {
    int v = q.front();
    q.pop();
    
    int center = find_centroid(v);
    mp.clear();
    solve(center, -1, 0, 0);

    used[center] = true;
    for (int i = 0; i < (int)g[center].size(); i++) {
      int to = g[center][i].first;
      if (used[to]) continue;
      if (sz[to] == 1) continue;
      q.push(to);
    }
  }
}

int best_path(int n, int K, int h[][2], int l[]) {
  k = K;
  for (int i = 0; i < n - 1; i++) {
    int a = h[i][0];
    int b = h[i][1];
    int c = l[i];
    g[a].push_back(make_pair(b, c));
    g[b].push_back(make_pair(a, c));
  }

  centroid_decomposition();

  return answ;
}

Compilation message

race.cpp: In function 'int find_center(int, int)':
race.cpp:55:5: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   55 |     if (to == p) continue;
      |     ^~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 3 ms 5004 KB Output is correct
6 Correct 4 ms 5012 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 4 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 4 ms 5008 KB Output is correct
12 Correct 4 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 4 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 5008 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 3 ms 5004 KB Output is correct
6 Correct 4 ms 5012 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 4 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 4 ms 5008 KB Output is correct
12 Correct 4 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 4 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 5008 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 5 ms 5068 KB Output is correct
22 Correct 6 ms 5068 KB Output is correct
23 Correct 5 ms 5020 KB Output is correct
24 Correct 4 ms 5068 KB Output is correct
25 Correct 5 ms 5068 KB Output is correct
26 Correct 4 ms 5068 KB Output is correct
27 Correct 5 ms 5068 KB Output is correct
28 Correct 5 ms 5068 KB Output is correct
29 Correct 5 ms 5120 KB Output is correct
30 Correct 5 ms 5068 KB Output is correct
31 Correct 5 ms 5068 KB Output is correct
32 Correct 5 ms 5148 KB Output is correct
33 Correct 5 ms 5088 KB Output is correct
34 Correct 4 ms 5068 KB Output is correct
35 Correct 4 ms 5068 KB Output is correct
36 Correct 5 ms 5068 KB Output is correct
37 Correct 5 ms 5068 KB Output is correct
38 Correct 5 ms 5068 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 3 ms 5004 KB Output is correct
6 Correct 4 ms 5012 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 4 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 4 ms 5008 KB Output is correct
12 Correct 4 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 4 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 5008 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct
19 Correct 314 ms 12248 KB Output is correct
20 Correct 357 ms 12276 KB Output is correct
21 Correct 304 ms 12228 KB Output is correct
22 Correct 314 ms 12244 KB Output is correct
23 Correct 180 ms 12560 KB Output is correct
24 Correct 103 ms 12176 KB Output is correct
25 Correct 222 ms 18732 KB Output is correct
26 Correct 157 ms 19496 KB Output is correct
27 Correct 370 ms 18844 KB Output is correct
28 Correct 629 ms 33344 KB Output is correct
29 Correct 700 ms 32808 KB Output is correct
30 Correct 364 ms 18884 KB Output is correct
31 Correct 339 ms 18836 KB Output is correct
32 Correct 467 ms 18988 KB Output is correct
33 Correct 545 ms 18740 KB Output is correct
34 Correct 444 ms 19516 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 3 ms 5004 KB Output is correct
6 Correct 4 ms 5012 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 4 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 4 ms 5008 KB Output is correct
12 Correct 4 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 4 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 5008 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 5 ms 5068 KB Output is correct
22 Correct 6 ms 5068 KB Output is correct
23 Correct 5 ms 5020 KB Output is correct
24 Correct 4 ms 5068 KB Output is correct
25 Correct 5 ms 5068 KB Output is correct
26 Correct 4 ms 5068 KB Output is correct
27 Correct 5 ms 5068 KB Output is correct
28 Correct 5 ms 5068 KB Output is correct
29 Correct 5 ms 5120 KB Output is correct
30 Correct 5 ms 5068 KB Output is correct
31 Correct 5 ms 5068 KB Output is correct
32 Correct 5 ms 5148 KB Output is correct
33 Correct 5 ms 5088 KB Output is correct
34 Correct 4 ms 5068 KB Output is correct
35 Correct 4 ms 5068 KB Output is correct
36 Correct 5 ms 5068 KB Output is correct
37 Correct 5 ms 5068 KB Output is correct
38 Correct 5 ms 5068 KB Output is correct
39 Correct 314 ms 12248 KB Output is correct
40 Correct 357 ms 12276 KB Output is correct
41 Correct 304 ms 12228 KB Output is correct
42 Correct 314 ms 12244 KB Output is correct
43 Correct 180 ms 12560 KB Output is correct
44 Correct 103 ms 12176 KB Output is correct
45 Correct 222 ms 18732 KB Output is correct
46 Correct 157 ms 19496 KB Output is correct
47 Correct 370 ms 18844 KB Output is correct
48 Correct 629 ms 33344 KB Output is correct
49 Correct 700 ms 32808 KB Output is correct
50 Correct 364 ms 18884 KB Output is correct
51 Correct 339 ms 18836 KB Output is correct
52 Correct 467 ms 18988 KB Output is correct
53 Correct 545 ms 18740 KB Output is correct
54 Correct 444 ms 19516 KB Output is correct
55 Correct 25 ms 5836 KB Output is correct
56 Correct 20 ms 5768 KB Output is correct
57 Correct 168 ms 12496 KB Output is correct
58 Correct 63 ms 11524 KB Output is correct
59 Correct 333 ms 22888 KB Output is correct
60 Correct 1170 ms 40940 KB Output is correct
61 Correct 428 ms 19140 KB Output is correct
62 Correct 406 ms 19056 KB Output is correct
63 Correct 599 ms 19092 KB Output is correct
64 Correct 1366 ms 24496 KB Output is correct
65 Correct 674 ms 20620 KB Output is correct
66 Correct 962 ms 32936 KB Output is correct
67 Correct 142 ms 19472 KB Output is correct
68 Correct 671 ms 24072 KB Output is correct
69 Correct 643 ms 24140 KB Output is correct
70 Correct 558 ms 23240 KB Output is correct