oj.uz

답안 #480337

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
480337 2021-10-15T17:20:57 Z lukameladze Papričice (COCI20_papricice) C++14
110 / 110
 512 ms 41776 KB 
# include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
using namespace std;
const int N = 3e5 + 5;
int n,sz[N],ans,rem,szz,a,b;
multiset <int> ms,mss,ms1,mss1;
multiset <int> :: iterator it;
vector <int> v[N];
int get(int a, int b, int c) {
     return (max(a,max(b,c))- min(a,min(b,c)));
}
void dfs(int a, int p) {
     sz[a] = 1;
     for (int i = 0; i < v[a].size(); i++) {
          if (v[a][i] == p) continue;
          dfs(v[a][i],a);
          sz[a] += sz[v[a][i]];
     }
}
void dfs1(int a, int p) {
    // cout<<a<<" "<<(int)ms.size()<<" "<<ms1.size()<<endl;
     rem = (n - sz[a]);
     it = ms.lower_bound(rem/2);
     if (it != ms.end()) {
          ans = min(ans, get(sz[a],*it, n - sz[a] - *it));
     }
     it = mss.lower_bound(-rem/2);
     if (it != mss.end()) {
          ans = min(ans, get(sz[a], -(*it), n - sz[a] - (-(*it))));
     }
     it = ms1.lower_bound(rem/2 + sz[a]);
     if (it != ms1.end()) {
          ans = min(ans, get(sz[a], (*it)-sz[a], n - (*it)));
     }
     it = mss1.lower_bound(-(rem/2+sz[a]));
     szz = -(*it);
     if (it != mss1.end()) {
          ans = min(ans, get(sz[a], szz - sz[a], n - szz));
     }
     ms1.insert(sz[a]);
     mss1.insert(-sz[a]);
     for (int i = 0; i < v[a].size(); i++) {
          if (v[a][i] == p) continue;
          dfs1(v[a][i],a);
     }
     ms.insert(sz[a]);
     mss.insert(-sz[a]);
     ms1.erase(ms1.find(sz[a]));
     mss1.erase(mss1.find(-sz[a]));
}
main() {
     cin>>n;
     for (int i = 1; i <= n - 1; i++) {
          cin>>a>>b;
          v[a].pb(b);
          v[b].pb(a);
     } ans = 1e9;
     dfs(1,0);
     dfs1(1,0);
    
     cout<<ans<<endl;
}

Compilation message

papricice.cpp: In function 'void dfs(int, int)':
papricice.cpp:16:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |      for (int i = 0; i < v[a].size(); i++) {
      |                      ~~^~~~~~~~~~~~~
papricice.cpp: In function 'void dfs1(int, int)':
papricice.cpp:44:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |      for (int i = 0; i < v[a].size(); i++) {
      |                      ~~^~~~~~~~~~~~~
papricice.cpp: At global scope:
papricice.cpp:53:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   53 | main() {
      | ^~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 6 ms 7340 KB Output is correct
3 Correct 5 ms 7244 KB Output is correct
4 Correct 5 ms 7372 KB Output is correct
5 Correct 6 ms 7344 KB Output is correct

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 6 ms 7340 KB Output is correct
3 Correct 5 ms 7244 KB Output is correct
4 Correct 5 ms 7372 KB Output is correct
5 Correct 6 ms 7344 KB Output is correct
6 Correct 7 ms 7628 KB Output is correct
7 Correct 8 ms 7628 KB Output is correct
8 Correct 7 ms 7500 KB Output is correct
9 Correct 9 ms 7628 KB Output is correct
10 Correct 8 ms 7628 KB Output is correct

Subtask #3
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 6 ms 7340 KB Output is correct
3 Correct 5 ms 7244 KB Output is correct
4 Correct 5 ms 7372 KB Output is correct
5 Correct 6 ms 7344 KB Output is correct
6 Correct 7 ms 7628 KB Output is correct
7 Correct 8 ms 7628 KB Output is correct
8 Correct 7 ms 7500 KB Output is correct
9 Correct 9 ms 7628 KB Output is correct
10 Correct 8 ms 7628 KB Output is correct
11 Correct 512 ms 35748 KB Output is correct
12 Correct 487 ms 35616 KB Output is correct
13 Correct 371 ms 36168 KB Output is correct
14 Correct 417 ms 35876 KB Output is correct
15 Correct 448 ms 35708 KB Output is correct
16 Correct 345 ms 35644 KB Output is correct
17 Correct 442 ms 35724 KB Output is correct
18 Correct 495 ms 41776 KB Output is correct
19 Correct 417 ms 35804 KB Output is correct
20 Correct 488 ms 35776 KB Output is correct