제출 #503019

#제출 시각아이디문제언어결과실행 시간메모리
503019MilosMilutinovic친구 (IOI14_friend)C++14
100 / 100
40 ms7012 KiB
#include <bits/stdc++.h> using namespace std; #define rep(i,a,n) for (int i=a;i<n;i++) #define per(i,a,n) for (int i=n-1;i>=a;i--) #define pb push_back #define mp make_pair #define all(x) (x).begin(),(x).end() #define fi first #define se second #define SZ(x) ((int)(x).size()) typedef vector<int> VI; typedef long long ll; typedef pair<int,int> PII; typedef double db; mt19937 mrand(random_device{}()); const ll mod=1000000007; int rnd(int x) { return mrand() % x;} ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;} ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;} // head const int N=101000; int n,a[N],dp[N][2]; vector<PII> e[N]; void dfs(int u) { dp[u][0]=a[u]; for (auto p:e[u]) { int v=p.fi,t=p.se; dfs(v); if(t==0) { dp[u][0]=dp[u][0]+dp[v][1]; dp[u][1]=max(dp[u][1]+dp[v][1],dp[u][1]+dp[v][0]); } else if (t==1) { dp[u][0]=max({dp[u][0]+dp[v][1],dp[v][0]+dp[u][1],dp[u][0]+dp[v][0]}); dp[u][1]=dp[u][1]+dp[v][1]; } else { dp[u][0]=max(dp[u][0]+dp[v][1],dp[v][0]+dp[u][1]); dp[u][1]=dp[u][1]+dp[v][1]; } } } int findSample(int n,int c[],int p[],int t[]) { rep(i,0,n) a[i]=c[i]; per(i,1,n) e[p[i]].pb(mp(i,t[i])); dfs(0); return max(dp[0][0],dp[0][1]); }
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