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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#374902 | #7684. Sweet Sugar | arnold518 | WA | 9ms | 54776kb | C++17 | 3.4kb | 2024-04-02 19:23:20 | 2024-04-02 19:23:20 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int MAXN = 1e6;
int TC, N, K;
int A[MAXN+10];
vector<int> adj[MAXN+10];
int dp[MAXN+10], dp2[MAXN+10], sum[MAXN+10], sz[MAXN+10], ans;
vector<int> V[MAXN+10];
bool dfs(int now, int bef)
{
int cnt=0;
for(auto nxt : adj[now])
{
if(nxt==bef) continue;
if(dfs(nxt, now)) continue;
cnt++;
if(cnt==1) swap(V[now], V[nxt]), dp2[now]=dp2[nxt];
int t=dp[now]+dp[nxt];
if(dp[now]!=sz[now]) t=min(t, dp[now]);
if(dp[nxt]!=sz[nxt]) t=min(t, dp[nxt]);
dp[now]=t;
sum[now]+=sum[nxt];
sz[now]+=sz[nxt];
}
sum[now]+=A[now];
sz[now]+=(A[now]!=0);
if(cnt>1)
{
V[now].clear();
if(sum[now]>=K)
{
bool flag=true;
if(A[now]==0)
{
if(K%2 && K/2<dp[now]) flag=false;
}
else if(A[now]==2)
{
if(K%2 && K/2<dp[now]+1) flag=false;
}
else if(A[now]==1)
{
if(K%2==0 && K/2<=dp[now]) flag=false;
}
if(flag || sum[now]==K) { ans++; return true; }
}
if(A[now]==2) dp[now]++;
else if(A[now]==1) dp[now]=0;
dp2[now]=dp[now];
}
else
{
int t=dp2[now];
if(!V[now].empty()) t=V[now].back();
if(A[now]==1) V[now].push_back(t);
else if(A[now]==2) V[now].push_back(t+1);
// printf("%d : ", now);
// for(auto it : V[now]) printf("%d ", it);
// printf(" : %d %d\n", dp[now], dp2[now]);
if(sum[now]>=K)
{
if(V[now].empty())
{
if(dp2[now]*2<=K) { ans++; return true; }
else if(K%2==0) { ans++; return true; }
}
else if(V[now].size()+dp2[now]+V[now].back()<=K) { ans++; return true; }
else if(V[now].back()-dp2[now]+V[now].size()<=K)
{
if((V[now].back()-dp2[now]+V[now].size()+K)%2==0) { ans++; return true; }
}
else
{
//for(int mid=0; mid<V[now].size(); mid++) printf("%d ", V[now].size()-1-mid+V[now].back()-V[now][mid]); printf("!\n");
int lo=-1, hi=V[now].size()-1;
while(lo+1<hi)
{
int mid=lo+hi>>1;
if(V[now].size()-1-mid+V[now].back()-V[now][mid]<=K) hi=mid;
else lo=mid;
}
if(V[now].size()-hi-1+V[now].back()-V[now][hi]!=K) { ans++; return true; }
}
}
if(A[now]==2) dp[now]++;
else if(A[now]==1) dp[now]=0;
}
return false;
}
int main()
{
scanf("%d", &TC);
while(TC--)
{
scanf("%d%d", &N, &K);
for(int i=1; i<=N; i++) scanf("%d", &A[i]);
for(int i=1; i<N; i++)
{
int u, v;
scanf("%d%d", &u, &v);
adj[u].push_back(v);
adj[v].push_back(u);
}
dfs(1, 1);
printf("%d\n", ans);
for(int i=1; i<=N; i++)
{
dp[i]=sum[i]=sz[i]=dp2[i]=0;
adj[i].clear();
V[i].clear();
}
ans=0;
}
}
Details
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Test #1:
score: 100
Accepted
time: 9ms
memory: 54192kb
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: -100
Wrong Answer
time: 3ms
memory: 54776kb
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 1 0 0 1 0 0 0 0 0 0
result:
wrong answer 3rd numbers differ - expected: '0', found: '1'