Submission #956611

#	Time	Username	Problem	Language	Result	Execution time	Memory
956611		vjudge1	Magic Tree (CEOI19_magictree)	C11	100 / 100	176 ms	106484 KiB

magictree

#include<stdio.h>

long long min_(long long a,long long b){return a<b?a:b;}
long long max_(long long a,long long b){return a>b?a:b;}

#define M 4000000
long long LIT[M],A[M],B[M];
int L[M],R[M],alc,trash[M],to;

int alloc() {int p=to?trash[--to]:++alc;L[p]=R[p]=A[p]=B[p]=LIT[p]=0;return p;}
void delet(int v){if(!v)return;trash[to++]=v;delet(L[v]);delet(R[v]);}

void pull(int v)
{
    A[v]=min_(A[L[v]]+LIT[L[v]],A[R[v]]+LIT[R[v]]);
    B[v]=max_(B[L[v]]+LIT[L[v]],B[R[v]]+LIT[R[v]]);
    if(A[v]==B[v])delet(L[v]),delet(R[v]),L[v]=0,R[v]=0;
}

int same(int v){return A[v]==B[v];}

int merge(int p, int q) {
    if(!p||!q)return p^q;
    if(same(p)){LIT[q]+=A[p]+LIT[p];return q;}
    if(same(q)){LIT[p]+=A[q]+LIT[q];return p;}
    L[p]=merge(L[p],L[q]);
    R[p]=merge(R[p],R[q]);
    pull(p);
    LIT[p]+=LIT[q];
    return p;
}

long long qry(int v,int l,int r,int p)
{
    if(same(v)) return LIT[v]+A[v];
    if(p<=(l+r)/2)return LIT[v]+qry(L[v],l,(l+r)/2,p);
    return LIT[v]+qry(R[v],(l+r)/2+1,r,p);
}

void chmax(int v,int l,int r,int x,int y,long long k)
{
    k-=LIT[v];
    if(A[v]>=k)return;
    if(x<=l&&r<=y&&B[v]<=k)
    {
        A[v]=B[v]=k;
        delet(R[v]);delet(L[v]);L[v]=R[v]=0;
        return;
    }
    if(same(v))
    {
        L[v]=alloc();R[v]=alloc();
        A[L[v]]=A[R[v]]=B[R[v]]=B[L[v]]=B[v];
    }
    if(x<=(l+r)/2) chmax(L[v],l,(l+r)/2,x,y,k);
    if(y>(l+r)/2) chmax(R[v],(l+r)/2+1,r,x,y,k);
    pull(v);
}

#define N 100005

int n,m,k,e[N][2],eo,h[N],d[N],w[N],t[N];

void dfs(int u,int p)
{
    t[u]=alloc();
    for(int v,j=h[u];j;j=e[j][1])if((v=e[j][0])^p) dfs(v,u),t[u]=merge(t[u],t[v]);
    if(~d[u]) chmax(t[u],1,k,d[u],k,w[u]+qry(t[u],1,k,d[u]));
}

int main()
{
    scanf("%d%d%d",&n,&m,&k);
    for(int i=1;i<=n;++i)d[i]=-1;
    for(int p,i=2;i<=n;++i) scanf("%d",&p),e[++eo][0]=i,e[eo][1]=h[p],h[p]=eo;
    for(int vv,dd,ww,i=0;i<m;++i) scanf("%d%d%d",&vv,&dd,&ww), d[vv]=dd,w[vv]=ww;
    dfs(1,1);
    printf("%lld",LIT[t[1]]+B[t[1]]);
}

Compilation message (stderr)

magictree.c: In function 'main':
magictree.c:73:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |     scanf("%d%d%d",&n,&m,&k);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
magictree.c:75:29: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |     for(int p,i=2;i<=n;++i) scanf("%d",&p),e[++eo][0]=i,e[eo][1]=h[p],h[p]=eo;
      |                             ^~~~~~~~~~~~~~
magictree.c:76:35: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |     for(int vv,dd,ww,i=0;i<m;++i) scanf("%d%d%d",&vv,&dd,&ww), d[vv]=dd,w[vv]=ww;
      |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 3 / 3
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 13 / 13
• Subtask 7: 22 / 22
• Subtask 8: 17 / 17