oj.uz

답안 #768794

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
768794 2023-06-28T15:46:42 Z 1075508020060209tc Janjetina (COCI21_janjetina) C++14
50 / 110
 96 ms 15876 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define X first
#define Y second
int n;int K;
int uf[200005];
int usz[200005];
pair<int,pair<int,int>>e[200005];
int fin(int x){
if(uf[x]==x){return x;}
uf[x]=fin(uf[x]);
return uf[x];
}
void mrg(int a,int b){
int pa=fin(a);int pb=fin(b);
uf[pa]=pb;
usz[pb]+=usz[pa];
}
int ans;
vector<pair<int,int>>ee[200005];
int dph[200005];
void dfs(int nw,int pa,int mxv){
    if(pa&&mxv-dph[nw]>=K){
        ans++;
    }
    for(int i=0;i<ee[nw].size();i++){
        int v=ee[nw][i].first;
        if(v==pa){continue;}
        int w=ee[nw][i].second;
        dph[v]=dph[nw]+1;
        dfs(v,nw,max(mxv,w) );
    }
}
void solve(){
ans=0;
for(int i=1;i<=n;i++){
    dph[i]=0;
    dfs(i,0,0);
}
cout<<ans<<endl;
exit(0);
}

signed main(){
cin>>n>>K;
for(int i=1;i<=n-1;i++){
    cin>>e[i].second.first>>e[i].second.second>>e[i].first;
    int a=e[i].second.first;int b=e[i].second.second;int c=e[i].first;
    ee[a].push_back({b,c});
    ee[b].push_back({a,c});
}

if(n<=1000){
    solve();
}

sort(e+1,e+n-1+1);
for(int i=1;i<=n;i++){
    uf[i]=i;
    usz[i]=1;
}
ans=0;
for(int i=1;i<=n-1;i++){
    int W=e[i].first;
    //L<=W-K
    int a=e[i].second.first;int b=e[i].second.second;
    a=fin(a);b=fin(b);
    if(usz[a]>usz[b]){
        swap(a,b);
    }
    for(int j=1;j<=usz[a];j++){
        ans+=max(0ll,min((W-K)-j+1ll,usz[b]));
    }
    mrg(a,b);
  //  cout<<W<<" "<<ans<<endl;
}
cout<<ans*2<<endl;

}

Compilation message

Main.cpp: In function 'void dfs(long long int, long long int, long long int)':
Main.cpp:27:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=0;i<ee[nw].size();i++){
      |                 ~^~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 5 ms 4912 KB Output is correct
3 Correct 4 ms 4892 KB Output is correct
4 Correct 10 ms 5140 KB Output is correct
5 Correct 10 ms 5076 KB Output is correct
6 Correct 10 ms 5080 KB Output is correct
7 Correct 10 ms 5144 KB Output is correct
8 Correct 12 ms 5244 KB Output is correct
9 Correct 10 ms 4992 KB Output is correct
10 Correct 11 ms 5076 KB Output is correct
11 Correct 10 ms 5084 KB Output is correct
12 Correct 10 ms 5076 KB Output is correct
13 Correct 10 ms 5076 KB Output is correct
14 Correct 10 ms 5092 KB Output is correct
15 Correct 11 ms 5084 KB Output is correct
16 Correct 10 ms 5088 KB Output is correct
17 Correct 10 ms 5084 KB Output is correct
18 Correct 10 ms 5084 KB Output is correct
19 Correct 11 ms 5076 KB Output is correct
20 Correct 10 ms 5076 KB Output is correct
21 Correct 11 ms 5084 KB Output is correct
22 Correct 11 ms 5024 KB Output is correct

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 10 ms 5144 KB Output is correct
5 Correct 13 ms 5844 KB Output is correct
6 Correct 41 ms 10060 KB Output is correct
7 Correct 63 ms 14952 KB Output is correct
8 Correct 81 ms 15416 KB Output is correct
9 Correct 76 ms 14924 KB Output is correct
10 Correct 79 ms 15288 KB Output is correct
11 Correct 76 ms 14888 KB Output is correct
12 Correct 76 ms 15384 KB Output is correct
13 Correct 92 ms 15040 KB Output is correct
14 Correct 80 ms 15260 KB Output is correct
15 Correct 76 ms 15080 KB Output is correct
16 Correct 79 ms 15344 KB Output is correct
17 Correct 80 ms 15308 KB Output is correct
18 Correct 78 ms 15192 KB Output is correct

Subtask #3
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 5 ms 4912 KB Output is correct
3 Correct 4 ms 4892 KB Output is correct
4 Correct 10 ms 5140 KB Output is correct
5 Correct 10 ms 5076 KB Output is correct
6 Correct 10 ms 5080 KB Output is correct
7 Correct 10 ms 5144 KB Output is correct
8 Correct 12 ms 5244 KB Output is correct
9 Correct 10 ms 4992 KB Output is correct
10 Correct 11 ms 5076 KB Output is correct
11 Correct 10 ms 5084 KB Output is correct
12 Correct 10 ms 5076 KB Output is correct
13 Correct 10 ms 5076 KB Output is correct
14 Correct 10 ms 5092 KB Output is correct
15 Correct 11 ms 5084 KB Output is correct
16 Correct 10 ms 5088 KB Output is correct
17 Correct 10 ms 5084 KB Output is correct
18 Correct 10 ms 5084 KB Output is correct
19 Correct 11 ms 5076 KB Output is correct
20 Correct 10 ms 5076 KB Output is correct
21 Correct 11 ms 5084 KB Output is correct
22 Correct 11 ms 5024 KB Output is correct
23 Correct 2 ms 4948 KB Output is correct
24 Correct 3 ms 4948 KB Output is correct
25 Correct 3 ms 4948 KB Output is correct
26 Correct 10 ms 5144 KB Output is correct
27 Correct 13 ms 5844 KB Output is correct
28 Correct 41 ms 10060 KB Output is correct
29 Correct 63 ms 14952 KB Output is correct
30 Correct 81 ms 15416 KB Output is correct
31 Correct 76 ms 14924 KB Output is correct
32 Correct 79 ms 15288 KB Output is correct
33 Correct 76 ms 14888 KB Output is correct
34 Correct 76 ms 15384 KB Output is correct
35 Correct 92 ms 15040 KB Output is correct
36 Correct 80 ms 15260 KB Output is correct
37 Correct 76 ms 15080 KB Output is correct
38 Correct 79 ms 15344 KB Output is correct
39 Correct 80 ms 15308 KB Output is correct
40 Correct 78 ms 15192 KB Output is correct
41 Correct 3 ms 4948 KB Output is correct
42 Correct 81 ms 14852 KB Output is correct
43 Correct 86 ms 15444 KB Output is correct
44 Correct 76 ms 14988 KB Output is correct
45 Correct 83 ms 15308 KB Output is correct
46 Correct 92 ms 14864 KB Output is correct
47 Correct 79 ms 15444 KB Output is correct
48 Correct 73 ms 14956 KB Output is correct
49 Correct 95 ms 15288 KB Output is correct
50 Correct 96 ms 15180 KB Output is correct
51 Correct 78 ms 15244 KB Output is correct
52 Correct 75 ms 15556 KB Output is correct
53 Incorrect 90 ms 15876 KB Output isn't correct
54 Halted 0 ms 0 KB -