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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#415550 | #7684. Sweet Sugar | xuzhihaodedie | WA | 112ms | 7816kb | C++20 | 1.5kb | 2024-05-20 23:22:24 | 2024-05-20 23:22:24 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define PII pair<int,int>
#define lson 2*p
#define rson 2*p+1
#define x first
#define y second
#define endl "\n"
constexpr int N=1e6+10;
constexpr int mod=998244353;
const int INF=1e15;
int dp[N][2],c[N];
int n,k,ans;
vector<int> g[N];
void dfs(int x,int fa) {
for(int y:g[x]) {
if(y==fa) continue;
dfs(y,x);
if((dp[y][0]>=k&&k%2==0)||(dp[y][1]>=k&&k%2==1)) {
ans++;
continue;
}
int val0=dp[x][0],val1=dp[x][1];
dp[x][0]=max(dp[x][0],val0+dp[y][0]);
if(dp[y][1]!=-1) {
dp[x][1]=max(dp[x][1],val0+dp[y][1]);
if(val1!=-1) dp[x][0]=max(dp[x][0],val1+dp[y][1]);
}
if(val1!=-1) dp[x][1]=max(dp[x][0],val1+dp[y][0]);
}
int val0=dp[x][0],val1=dp[x][1];
if(c[x]&1) {
dp[x][1]=max(dp[x][1],val0+c[x]);
if(val1!=-1) dp[x][0]=max(dp[x][0],val1+c[x]);
else dp[x][0]=0;
} else {
dp[x][0]=max(dp[x][0],val0+c[x]);
if(val1!=-1) dp[x][1]=max(dp[x][1],val1+c[x]);
else dp[x][1]=-1;
}
}
void solve() {
cin>>n>>k;
for(int i=1;i<=n;i++) {
cin>>c[i];
g[i].clear();
dp[i][0]=0,dp[i][1]=-1;
}
for(int i=1;i<n;i++) {
int u,v;
cin>>u>>v;
g[u].push_back(v);
g[v].push_back(u);
}
ans=0;
dfs(1,0);
if((dp[1][0]>=k&&k%2==0)||(dp[1][1]>=k&&k%2==1)) ans++;
cout<<ans<<endl;
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
int T=1;
cin>>T;
while(T--) {
solve();
}
}
/*
*/
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 7816kb
input:
4 7 5 1 2 1 2 2 1 2 1 2 2 3 3 4 3 5 5 6 5 7 2 2 1 0 1 2 1 1 1 1 2 1
output:
2 0 1 0
result:
ok 4 number(s): "2 0 1 0"
Test #2:
score: 0
Accepted
time: 2ms
memory: 7748kb
input:
12 1 1 0 1 1 1 1 1 2 1 2 0 1 2 1 1 2 2 1 3 0 1 3 1 1 3 2 1 2000000 0 1 2000000 1 1 2000000 2
output:
0 1 0 0 0 1 0 0 0 0 0 0
result:
ok 12 numbers
Test #3:
score: -100
Wrong Answer
time: 112ms
memory: 7780kb
input:
200000 5 2 1 1 0 0 1 2 4 5 2 4 1 3 2 5 1 0 0 0 0 0 5 1 1 2 3 2 5 4 5 3 1 0 0 0 1 1 4 4 2 3 4 5 2 5 9 1 0 0 0 2 4 3 2 1 3 1 5 1 5 3 0 1 1 0 1 5 4 2 1 4 3 5 1 5 1 0 2 1 1 1 5 3 2 4 3 4 1 4 5 1 1 0 1 1 0 1 5 4 2 1 3 5 2 5 7 0 2 1 1 2 5 1 2 3 2 5 5 4 5 5 0 1 0 1 0 2 4 4 3 5 2 1 5 5 1 0 0 1 0 1 4 1 4 5 2...
output:
1 0 0 0 1 3 3 0 0 2 0 0 2 1 0 0 1 1 0 2 0 1 0 2 1 0 0 0 0 0 1 2 0 0 2 2 0 1 0 0 0 0 3 3 0 0 1 1 2 1 2 0 4 0 1 1 0 1 0 0 1 5 0 1 1 1 0 1 1 1 1 1 1 0 1 1 1 0 3 1 0 1 0 0 4 0 0 0 1 1 0 0 1 0 2 0 5 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 1 0 0 0 0 0 1 0 0 1 1 0 1 0 1 1 1 2 0 1 2 0 0 2 0 0 1 0 0 0 0 0 ...
result:
wrong answer 247th numbers differ - expected: '0', found: '1'