QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#780217 | #2596. Even Forest | niumachaoren | WA | 213ms | 96752kb | C++14 | 852b | 2024-11-25 08:49:32 | 2024-11-25 08:49:32 |
Judging History
answer
#include<bits/stdc++.h>
inline void read(int &x){
x=0;char ch=getchar();
while(!isdigit(ch))ch=getchar();
while(isdigit(ch)){
x=(x<<1)+(x<<3)+(ch^48);
ch=getchar();
}
}
using namespace std;
const int maxn=1e6+10;
int n,rt,dep[maxn],dp[maxn][2];
vector<int>e[maxn<<1];
void dfs(int u,int fa){
dep[u]=dep[fa]+1;
int siz=0;
for(int v:e[u]){
if(v==fa)continue;
siz++;
dfs(v,u);
dp[u][0]+=min(dp[v][0],dp[v][1]+1);
dp[u][1]+=min(dp[v][1],dp[v][0]+1);
}
if(!siz){
dp[u][dep[u]&1]=1;
}
}
int main(){
read(n);
for(int i=1;i<n;i++){
int u,v;
read(u),read(v);
e[u].push_back(v),e[v].push_back(u);
}
int cnt=0;
for(int i=1;i<=n;i++){
if(e[i].size()==1)cnt++;
}
if(cnt==2){
cout<<((n&1)^1)<<'\n';
return 0;
}
rt=1;
dfs(1,0);
cout<<min(dp[1][0],dp[1][1]);
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 8ms
memory: 51908kb
input:
4 1 2 2 3 3 4
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 6ms
memory: 50500kb
input:
4 1 2 1 3 1 4
output:
0
result:
ok 1 number(s): "0"
Test #3:
score: 0
Accepted
time: 8ms
memory: 50496kb
input:
6 1 2 2 3 4 2 4 5 6 4
output:
1
result:
ok 1 number(s): "1"
Test #4:
score: 0
Accepted
time: 4ms
memory: 50560kb
input:
1
output:
0
result:
ok 1 number(s): "0"
Test #5:
score: 0
Accepted
time: 10ms
memory: 50512kb
input:
2 1 2
output:
1
result:
ok 1 number(s): "1"
Test #6:
score: 0
Accepted
time: 7ms
memory: 50432kb
input:
3 2 3 3 1
output:
0
result:
ok 1 number(s): "0"
Test #7:
score: 0
Accepted
time: 4ms
memory: 50432kb
input:
4 2 3 3 1 3 4
output:
0
result:
ok 1 number(s): "0"
Test #8:
score: 0
Accepted
time: 0ms
memory: 50492kb
input:
5 4 2 2 3 4 1 5 3
output:
0
result:
ok 1 number(s): "0"
Test #9:
score: 0
Accepted
time: 4ms
memory: 51744kb
input:
6 4 3 1 4 2 4 5 2 4 6
output:
1
result:
ok 1 number(s): "1"
Test #10:
score: 0
Accepted
time: 4ms
memory: 50564kb
input:
50 21 22 22 27 22 7 22 12 22 13 43 22 36 22 35 22 6 22 10 22 22 38 19 22 34 22 8 22 22 44 22 3 9 22 22 16 23 22 18 22 22 25 22 5 22 2 22 15 46 22 37 22 48 22 33 22 22 17 31 22 22 29 22 28 22 49 4 22 22 26 41 22 22 32 22 50 22 20 22 30 24 22 40 22 22 45 14 22 22 11 42 22 39 22 1 22 47 22
output:
0
result:
ok 1 number(s): "0"
Test #11:
score: 0
Accepted
time: 213ms
memory: 96752kb
input:
1000000 851841 325834 455962 325834 135775 325834 525341 325834 265267 325834 868520 325834 834325 325834 867971 325834 325834 879726 325834 242607 325834 106951 122113 325834 325834 499633 727580 325834 325834 200171 325834 178877 325834 493841 957118 325834 325834 809324 325834 641895 325834 33338...
output:
0
result:
ok 1 number(s): "0"
Test #12:
score: 0
Accepted
time: 7ms
memory: 51148kb
input:
3 2 1 2 3
output:
0
result:
ok 1 number(s): "0"
Test #13:
score: 0
Accepted
time: 8ms
memory: 52464kb
input:
4 4 3 1 4 1 2
output:
1
result:
ok 1 number(s): "1"
Test #14:
score: 0
Accepted
time: 3ms
memory: 50424kb
input:
5 1 4 2 4 3 2 3 5
output:
0
result:
ok 1 number(s): "0"
Test #15:
score: 0
Accepted
time: 7ms
memory: 50556kb
input:
6 3 5 3 6 1 6 1 4 4 2
output:
1
result:
ok 1 number(s): "1"
Test #16:
score: 0
Accepted
time: 0ms
memory: 50500kb
input:
7 1 2 3 2 6 3 6 7 7 4 4 5
output:
0
result:
ok 1 number(s): "0"
Test #17:
score: 0
Accepted
time: 6ms
memory: 50568kb
input:
8 6 2 1 2 8 1 5 8 5 7 7 3 4 3
output:
1
result:
ok 1 number(s): "1"
Test #18:
score: 0
Accepted
time: 6ms
memory: 50432kb
input:
20 6 1 6 15 9 15 18 9 18 17 17 7 8 7 3 8 19 3 2 19 13 2 13 11 12 11 12 14 4 14 4 5 20 5 16 20 16 10
output:
1
result:
ok 1 number(s): "1"
Test #19:
score: 0
Accepted
time: 13ms
memory: 50424kb
input:
42 33 30 17 33 17 7 29 7 15 29 15 23 23 1 10 1 10 31 4 31 12 4 12 34 28 34 28 41 41 11 32 11 32 24 13 24 13 19 26 19 16 26 35 16 35 27 37 27 37 3 3 20 8 20 39 8 6 39 6 42 14 42 14 38 38 9 25 9 18 25 18 5 36 5 36 40 40 21 21 2 22 2
output:
1
result:
ok 1 number(s): "1"
Test #20:
score: -100
Wrong Answer
time: 3ms
memory: 50444kb
input:
27 19 14 6 19 16 19 19 7 19 4 21 19 26 4 26 15 4 5 5 1 10 26 13 26 17 7 3 4 23 13 21 25 2 25 2 12 10 9 20 17 24 16 21 27 22 13 8 16 18 7 11 24
output:
5
result:
wrong answer 1st numbers differ - expected: '6', found: '5'