Submission #32326

#	Time	Username	Problem	Language	Result	Execution time	Memory
32326		dqhungdl	File Paths (BOI15_fil)	C++14	33 / 100	156 ms	2144 KiB

fil

#include <bits/stdc++.h>
using namespace std;

int n,m,k,s,Count=0,l[3005],P[3005],sum[3005],In[3005],Ou[3005];
vector<int> g[3005];

void DFS(int u,int len)
{
    In[u]=++Count;
    sum[u]=len;
    for(int i=0;i<g[u].size();i++)
        DFS(g[u][i],len+l[g[u][i]]);
    Ou[u]=Count;
}

bool Father(int u,int v)
{
    return (In[u]<=In[v]&&In[v]<=Ou[u]);
}

bool Check(int p,int len)
{
    int S=len,tmp=p;
    while(tmp>0)
    {
        S+=l[tmp];
        tmp=P[tmp];
    }
    for(int i=0;i<=n;i++)
        if(Father(i,p)==true)
            for(int j=0;j<=n;j++)
            {
                if(S+(sum[j]-sum[i]+s)==k)
                    return true;
                if(Father(i,j)==true&&(k-S)%(sum[j]-sum[i]+s)==0)
                    return true;
            }
    return false;
}

void Sub1()
{
    DFS(0,0);
    int p,len;
    for(int i=1;i<=m;i++)
    {
        cin>>p>>len;
        if(Check(p,len+1)==true)
            cout<<"YES\n";
        else
            cout<<"NO\n";
    }
}

int main()
{
    //freopen("FIL.INP","r",stdin);
    //freopen("FIL.OUT","w",stdout);
    scanf("%d%d%d%d",&n,&m,&k,&s);
    s++;
    for(int i=1;i<=n;i++)
    {
        scanf("%d%d",&P[i],&l[i]);
        l[i]++;
        g[P[i]].push_back(i);
    }
    if(n<=500&&m<=500)
        Sub1();
}

Compilation message (stderr)

fil.cpp: In function 'void DFS(int, int)':
fil.cpp:11:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g[u].size();i++)
                  ^
fil.cpp: In function 'int main()':
fil.cpp:59:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d%d",&n,&m,&k,&s);
                                  ^
fil.cpp:63:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&P[i],&l[i]);
                                  ^

• Subtask 1: 33 / 33
• Subtask 2: 0 / 33
• Subtask 3: 0 / 34