oj.uz

답안 #363756

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
363756 2021-02-07T08:16:41 Z Bill_00 Election Campaign (JOI15_election_campaign) C++14
10 / 100
 647 ms 29676 KB 
#include <bits/stdc++.h>
#define pb push_back
#define ff first
#define ss second
#define N 100001
typedef long long ll;
const long long MOD=1000000007;
using namespace std;
struct plan{
	int x,y,votes;
};

int timer,m,n,l,k,sz[N],h[N],seg[N];
int tin[N],tout[N],up[N][20];
int in[N],out[N],tree[4*N+4];

vector<plan>path[N];
vector<int>adj[N];

void dfs(int node,int par=1){
	tin[node]=++timer;
	up[node][0]=par;
	for(int i=1;i<=l;i++){
		up[node][i]=up[up[node][i-1]][i-1];
	}
	sz[node]=1;
	for(int x:adj[node]){
		if(x!=par){
			dfs(x,node);
			sz[node]+=sz[x];
		} 
	}
	tout[node]=++timer;
}

void dfs1(int node,int par,int head){
	seg[node]=++k;
	h[node]=head;
	pair<int,int>bigchild={0,-1};
	for(int x:adj[node]){
		if(x!=par) bigchild=max(bigchild,{sz[x],x});
	}
	if(bigchild.ss!=-1) dfs1(bigchild.ss,node,head);
	for(int x:adj[node]){
		if(x!=par && x!=bigchild.ss) dfs1(x,node,x);
	}
}

bool is(int a,int b){
	return (tin[a]<=tin[b] && tout[b]<=tout[a]);
}

int lca(int a,int b){
	if(is(a,b)) return a;
	if(is(b,a)) return b;
	for(int i=l;i>=0;i--){
		if(!is(up[a][i],b)) a=up[a][i];
	}
	return up[a][0];
}

int query(int id,int l,int r,int L,int R){
	if(r<L || R<l) return 0;
	if(L<=l && r<=R) return tree[id];
	int m=(l+r)>>1;
	return query(id*2,l,m,L,R)+query(id*2+1,m+1,r,L,R);
}

void update(int id,int l,int r,int x,int val){
	if(l==r){
		tree[id]=val;
		return;
	}
	int m=(l+r)>>1;
	if(m>=x) update(id*2,l,m,x,val);
	else update(id*2+1,m+1,r,x,val);
	tree[id]=tree[id*2]+tree[id*2+1];
}

int p(int a,int b){
	if(is(h[a],b)) return query(1,1,k,seg[b],seg[a]);
	return query(1,1,k,seg[h[a]],seg[a])+p(up[a][0],b);
}

void solve(int node,int par=1){
	for(int x:adj[node]){
		if(x!=par){
			solve(x,node);
			out[node]+=in[x];
			in[node]=max(in[node],in[x]);
		} 
	}
	for(plan xx:path[node]){
		int a=xx.x;
		int b=xx.y;
		int c=xx.votes;
		in[node]=max(in[node],p(a,node)+p(b,node)+c+out[node]);
	}
	update(1,1,k,seg[node],out[node]-in[node]);
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n;
	l=ceil(log2(n));
	for(int i=1;i<n;i++){
		int a,b;
		cin >> a >> b;
		adj[a].pb(b);
		adj[b].pb(a);
	}	
	dfs(1);
	dfs1(1,1,1);
	cin >> m;
	while(m--){
		int a,b,c;
		cin >> a >> b >> c;
		int x=lca(a,b);
		path[x].pb({a,b,c});
	}
	solve(1);
	cout << in[1];
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Incorrect 4 ms 5228 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 5 ms 5484 KB Output is correct
4 Correct 156 ms 29676 KB Output is correct
5 Correct 158 ms 29676 KB Output is correct
6 Correct 142 ms 29548 KB Output is correct
7 Correct 153 ms 29676 KB Output is correct
8 Correct 159 ms 29548 KB Output is correct
9 Correct 145 ms 29676 KB Output is correct
10 Correct 150 ms 29548 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 5 ms 5484 KB Output is correct
4 Correct 156 ms 29676 KB Output is correct
5 Correct 158 ms 29676 KB Output is correct
6 Correct 142 ms 29548 KB Output is correct
7 Correct 153 ms 29676 KB Output is correct
8 Correct 159 ms 29548 KB Output is correct
9 Correct 145 ms 29676 KB Output is correct
10 Correct 150 ms 29548 KB Output is correct
11 Correct 16 ms 5740 KB Output is correct
12 Correct 159 ms 29676 KB Output is correct
13 Correct 157 ms 29548 KB Output is correct
14 Correct 170 ms 29604 KB Output is correct
15 Correct 155 ms 29548 KB Output is correct
16 Correct 149 ms 29676 KB Output is correct
17 Correct 156 ms 29548 KB Output is correct
18 Correct 156 ms 29676 KB Output is correct
19 Correct 148 ms 29676 KB Output is correct
20 Correct 158 ms 29548 KB Output is correct

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 647 ms 21412 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Incorrect 4 ms 5228 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Incorrect 4 ms 5228 KB Output isn't correct
5 Halted 0 ms 0 KB -