28 lines
699 B
C++
28 lines
699 B
C++
#include <iostream>
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#include <cstdio>
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#include <cstring>
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using namespace std;
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const int maxn=1004;
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int dp[maxn][maxn];
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int data[maxn][2];
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int main(){
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int n,a,b;
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while(scanf("%d",&n)!=EOF){
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memset(dp,0,sizeof(dp));
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for(int i=4;i<=n;i++){
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scanf("%d%d",&a,&b);
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data[i][0]=a;
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data[i][1]=b;
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}
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int ans=0;
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for(int i=n;i>=4;i--){
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a=data[i][0];
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b=data[i][1];
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ans=max(ans,dp[a][b]+dp[a][i]+dp[i][b]+3);
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dp[a][b]=dp[b][a]=max(dp[a][b],dp[a][i]+dp[i][b]+1);
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}
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printf("%d\n",max(ans,dp[1][2]+dp[2][3]+dp[1][3]+3));
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}
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return 0;
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}
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