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답안 #931541

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
931541 2024-02-22T03:42:56 Z pcc Cat Exercise (JOI23_ho_t4) C++14
37 / 100
 472 ms 90348 KB 
#include <bits/stdc++.h>
using namespace std;


#define int ll
#define ll long long
#define pii pair<int,int>
#define fs first
#define sc second
#define pll pii

const int mxn = 2e5+10;
vector<int> op[mxn],tree[mxn];
vector<pii> ctree[mxn];
int N;
int arr[mxn],brr[mxn];

vector<int> dfn;
pii eul[mxn];

struct SEG{
	struct node{
		pii mx;
		int tag;
		node(){
			mx.fs = mx.sc = tag = 0;
		}
	};
	node seg[mxn*4];
	SEG(){
		for(auto &i:seg)i.mx.fs = i.mx.sc = i.tag = 0;
	}
	void push(int now){
		seg[now].mx.fs += seg[now].tag;
		seg[now*2+1].tag += seg[now].tag;
		seg[now*2+2].tag += seg[now].tag;
		return;
	}
	node pull(node ls,node rs){
		node re;
		ls.mx.fs += ls.tag,rs.mx.fs += rs.tag;
		re.mx = max(ls.mx,rs.mx);
		return re;
	}
	void modify(int now,int l,int r,int s,int e,int v){
		if(l>=s&&e>=r){
			if(l == r)seg[now].mx.sc = l;
			seg[now].tag += v;
			return;
		}
		push(now);
		int mid = (l+r)>>1;
		if(mid>=s)modify(now*2+1,l,mid,s,e,v);
		if(mid<e)modify(now*2+2,mid+1,r,s,e,v);
		seg[now] = pull(seg[now*2+1],seg[now*2+2]);
		return;
	}
	pll getbig(int now,int l,int r,int s,int e){
		if(l>=s&&e>=r)return make_pair(seg[now].mx.fs+seg[now].tag,seg[now].mx.sc);
		push(now);
		int mid = (l+r)>>1;
		if(mid>=e)return getbig(now*2+1,l,mid,s,e);
		else if(mid<s)return getbig(now*2+2,mid+1,r,s,e);
		else{
			return max(getbig(now*2+1,l,mid,s,e),getbig(now*2+2,mid+1,r,s,e));
		}
	}
};
SEG seg;

namespace DB{
	int par[mxn][20];
	int dep[mxn];
	void dfs(int now){
		for(int i = 1;i<20;i++)par[now][i] = par[par[now][i-1]][i-1];
		for(auto nxt:tree[now]){
			if(nxt == par[now][0])continue;
			dep[nxt] = dep[now]+1;
			par[nxt][0] = now;
			dfs(nxt);
		}
		return;
	}
	void GO(int rt){
		par[rt][0] = rt;
		dfs(rt);
	}
	int lca(int a,int b){
		if(dep[a]<dep[b])swap(a,b);
		int d = dep[a]-dep[b];
		for(int i = 19;i>=0;i--){
			if(d&(1<<i))a = par[a][i];
		}
		for(int i = 19;i>=0;i--){
			if(par[a][i] != par[b][i])a = par[a][i],b = par[b][i];
		}
		return a==b?a:par[a][0];
	}
	int up(int a,int d){
		for(int i = 19;i>=0;i--){
			if(d&(1<<i))a = par[a][i];
		}
		return a;
	}
	int dist(int a,int b){
		return dep[a]+dep[b]-dep[lca(a,b)]*2;
	}
}

namespace CTREE{
	void add_edge(int a,int b,int c){
		ctree[a].push_back(make_pair(b,c));
		//cerr<<"edge:"<<a<<','<<b<<":"<<c<<endl;
	}
	void GO(int rt,int par){
		assert(rt != par);
		for(auto nxt:tree[rt]){
			if(nxt == DB::par[rt][0])continue;
			//cerr<<rt<<":"<<nxt<<":";
			nxt = seg.getbig(0,1,N,eul[nxt].fs,eul[nxt].sc).sc;
			nxt = dfn[nxt];
			//cerr<<rt<<":"<<nxt<<endl;assert(rt != nxt);
			if(seg.getbig(0,1,N,eul[nxt].fs,eul[nxt].sc).fs > 0)add_edge(rt,nxt,DB::dist(rt,nxt));
			GO(nxt,rt);
		}
		seg.modify(0,1,N,eul[rt].fs,eul[rt].sc,-mxn);
		int u = DB::up(rt,DB::dep[rt]-DB::dep[par]-1);
		auto nx = seg.getbig(0,1,N,eul[u].fs,eul[u].sc);
		if(nx.fs<=0)return;
		nx.sc = dfn[nx.sc];
		//cerr<<"UP:"<<rt<<":"<<nx.fs<<','<<nx.sc<<endl;
		assert(nx.sc != rt);
		add_edge(rt,nx.sc,DB::dist(rt,nx.sc));
		GO(nx.sc,par);
		return;
	}
}


void edfs(int now,int par){
	dfn.push_back(now);
	eul[now].fs = dfn.size()-1;
	for(auto nxt:tree[now]){
		if(nxt == par)continue;
		edfs(nxt,now);
	}
	eul[now].sc = dfn.size()-1;
	return;
}
namespace DP{
	int dp[mxn];
	void dfs(int now,int par){
		dp[now] = 0;
		for(auto nxt:ctree[now]){
			if(nxt.fs == par)continue;
			dfs(nxt.fs,now);
			dp[now] = max(dp[now],dp[nxt.fs]+nxt.sc);
		}
		return;
	}
	void GO(int rt){
		dfs(rt,rt);
	}
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>N;
	for(int i = 1;i<=N;i++)cin>>arr[i],brr[i] = i;
	for(int i = 1;i<N;i++){
		int a,b;
		cin>>a>>b;
		tree[a].push_back(b);
		tree[b].push_back(a);
	}
	dfn.push_back(0);
	int rt = max_element(arr+1,arr+N+1)-arr;
	DB::GO(rt);
	edfs(rt,rt);//get euler
	//for(int i = 1;i<=N;i++)cerr<<dfn[i]<<',';cerr<<endl;
	//for(int i = 1;i<=N;i++)cerr<<i<<"::"<<eul[i].fs<<','<<eul[i].sc<<endl;
	for(int i = 1;i<=N;i++)seg.modify(0,1,N,i,i,arr[dfn[i]]);
	CTREE::GO(rt,0);
	DP::GO(rt);
	cout<<DP::dp[rt];
}

Compilation message

Main.cpp:166:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  166 | main(){
      | ^~~~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 40796 KB Output is correct
2 Correct 10 ms 41004 KB Output is correct
3 Correct 9 ms 40796 KB Output is correct
4 Correct 9 ms 40968 KB Output is correct
5 Correct 9 ms 41004 KB Output is correct
6 Correct 9 ms 40796 KB Output is correct
7 Correct 9 ms 40796 KB Output is correct
8 Correct 9 ms 41052 KB Output is correct
9 Correct 9 ms 40792 KB Output is correct
10 Correct 9 ms 40796 KB Output is correct

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 40796 KB Output is correct
2 Correct 10 ms 41004 KB Output is correct
3 Correct 9 ms 40796 KB Output is correct
4 Correct 9 ms 40968 KB Output is correct
5 Correct 9 ms 41004 KB Output is correct
6 Correct 9 ms 40796 KB Output is correct
7 Correct 9 ms 40796 KB Output is correct
8 Correct 9 ms 41052 KB Output is correct
9 Correct 9 ms 40792 KB Output is correct
10 Correct 9 ms 40796 KB Output is correct
11 Correct 10 ms 41052 KB Output is correct
12 Correct 10 ms 41052 KB Output is correct
13 Correct 10 ms 41008 KB Output is correct
14 Correct 10 ms 40940 KB Output is correct
15 Correct 10 ms 41052 KB Output is correct
16 Correct 10 ms 41052 KB Output is correct
17 Correct 10 ms 40988 KB Output is correct

Subtask #3
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 40796 KB Output is correct
2 Correct 10 ms 41004 KB Output is correct
3 Correct 9 ms 40796 KB Output is correct
4 Correct 9 ms 40968 KB Output is correct
5 Correct 9 ms 41004 KB Output is correct
6 Correct 9 ms 40796 KB Output is correct
7 Correct 9 ms 40796 KB Output is correct
8 Correct 9 ms 41052 KB Output is correct
9 Correct 9 ms 40792 KB Output is correct
10 Correct 9 ms 40796 KB Output is correct
11 Correct 10 ms 41052 KB Output is correct
12 Correct 10 ms 41052 KB Output is correct
13 Correct 10 ms 41008 KB Output is correct
14 Correct 10 ms 40940 KB Output is correct
15 Correct 10 ms 41052 KB Output is correct
16 Correct 10 ms 41052 KB Output is correct
17 Correct 10 ms 40988 KB Output is correct
18 Runtime error 55 ms 84052 KB Execution killed with signal 6
19 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 40796 KB Output is correct
2 Correct 10 ms 41004 KB Output is correct
3 Correct 9 ms 40796 KB Output is correct
4 Correct 9 ms 40968 KB Output is correct
5 Correct 9 ms 41004 KB Output is correct
6 Correct 9 ms 40796 KB Output is correct
7 Correct 9 ms 40796 KB Output is correct
8 Correct 9 ms 41052 KB Output is correct
9 Correct 9 ms 40792 KB Output is correct
10 Correct 9 ms 40796 KB Output is correct
11 Correct 10 ms 41052 KB Output is correct
12 Correct 10 ms 41052 KB Output is correct
13 Correct 10 ms 41008 KB Output is correct
14 Correct 10 ms 40940 KB Output is correct
15 Correct 10 ms 41052 KB Output is correct
16 Correct 10 ms 41052 KB Output is correct
17 Correct 10 ms 40988 KB Output is correct
18 Runtime error 55 ms 84052 KB Execution killed with signal 6
19 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 40796 KB Output is correct
2 Correct 10 ms 41004 KB Output is correct
3 Correct 9 ms 40796 KB Output is correct
4 Correct 9 ms 40968 KB Output is correct
5 Correct 9 ms 41004 KB Output is correct
6 Correct 9 ms 40796 KB Output is correct
7 Correct 9 ms 40796 KB Output is correct
8 Correct 9 ms 41052 KB Output is correct
9 Correct 9 ms 40792 KB Output is correct
10 Correct 9 ms 40796 KB Output is correct
11 Correct 10 ms 41052 KB Output is correct
12 Correct 10 ms 41052 KB Output is correct
13 Correct 10 ms 41008 KB Output is correct
14 Correct 10 ms 40940 KB Output is correct
15 Correct 10 ms 41052 KB Output is correct
16 Correct 10 ms 41052 KB Output is correct
17 Correct 10 ms 40988 KB Output is correct
18 Runtime error 55 ms 84052 KB Execution killed with signal 6
19 Halted 0 ms 0 KB -

Subtask #6
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 40796 KB Output is correct
2 Correct 9 ms 41004 KB Output is correct
3 Correct 472 ms 89968 KB Output is correct
4 Correct 464 ms 90348 KB Output is correct
5 Correct 455 ms 89800 KB Output is correct

Subtask #7
0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 40796 KB Output is correct
2 Correct 10 ms 41004 KB Output is correct
3 Correct 9 ms 40796 KB Output is correct
4 Correct 9 ms 40968 KB Output is correct
5 Correct 9 ms 41004 KB Output is correct
6 Correct 9 ms 40796 KB Output is correct
7 Correct 9 ms 40796 KB Output is correct
8 Correct 9 ms 41052 KB Output is correct
9 Correct 9 ms 40792 KB Output is correct
10 Correct 9 ms 40796 KB Output is correct
11 Correct 10 ms 41052 KB Output is correct
12 Correct 10 ms 41052 KB Output is correct
13 Correct 10 ms 41008 KB Output is correct
14 Correct 10 ms 40940 KB Output is correct
15 Correct 10 ms 41052 KB Output is correct
16 Correct 10 ms 41052 KB Output is correct
17 Correct 10 ms 40988 KB Output is correct
18 Runtime error 55 ms 84052 KB Execution killed with signal 6
19 Halted 0 ms 0 KB -