https://www.lydsy.com/JudgeOnline/problem.php?id=2809
板子题wa了一下因为输出ans没有lld
1 #include<iostream> 2 #include<cstdio> 3 #include<algorithm> 4 #include<cstring> 5 #include<cmath> 6 #include<queue> 7 using namespace std; 8 const int maxn=100100; 9 int n,m; 10 int ch[maxn][2]={},siz[maxn]={},sum[maxn]={},cnt[maxn]={},rt[maxn]={}; 11 int fa[maxn]={},val[maxn]={},l[maxn]={}; 12 int y[maxn],nex[maxn]={},head[maxn]={},tot=0; 13 long long ans=0; 14 void init(int x,int yi){ 15 y[++tot]=yi;nex[tot]=head[x];head[x]=tot; 16 } 17 void updata(int x){ 18 siz[x]=siz[ch[x][0]]+siz[ch[x][1]]+1; 19 sum[x]=sum[ch[x][0]]+sum[ch[x][1]]+val[x]; 20 } 21 int merge(int x,int y){ 22 if(x==0)return y;if(y==0)return x; 23 if(val[x]<val[y])swap(x,y); 24 ch[x][1]=merge(ch[x][1],y); 25 if(cnt[ch[x][1]]>cnt[ch[x][0]]) 26 swap(ch[x][1],ch[x][0]); 27 cnt[x]=cnt[ch[x][1]]+1; 28 updata(x); 29 return x; 30 } 31 void dfs(int x){ 32 for(int i=head[x];i;i=nex[i]){ 33 dfs(y[i]); 34 rt[x]=merge(rt[x],rt[y[i]]); 35 while(sum[rt[x]]>m){rt[x]=merge(ch[rt[x]][0],ch[rt[x]][1]);} 36 }ans=max(ans,(long long)l[x]*(long long)siz[rt[x]]); 37 } 38 int main(){ 39 scanf("%d%d",&n,&m); 40 for(int i=1;i<=n;i++){ 41 scanf("%d%d%d",&fa[i],&val[i],&l[i]); 42 sum[i]=val[i];rt[i]=i;siz[i]=1; 43 if(fa[i])init(fa[i],i); 44 } 45 dfs(1); 46 printf("%lld ",ans); 47 return 0; 48 }