oj.uz

답안 #363781

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
363781 2021-02-07T09:12:05 Z Bill_00 Election Campaign (JOI15_election_campaign) C++14
10 / 100
 1000 ms 32108 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]=out[node];
	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 4 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 Correct 4 ms 5228 KB Output is correct
5 Correct 147 ms 21100 KB Output is correct
6 Correct 75 ms 28780 KB Output is correct
7 Correct 137 ms 26092 KB Output is correct
8 Correct 104 ms 21100 KB Output is correct
9 Incorrect 159 ms 24428 KB Output isn't correct
10 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 4 ms 5356 KB Output is correct
4 Correct 156 ms 29676 KB Output is correct
5 Correct 158 ms 30060 KB Output is correct
6 Correct 146 ms 30316 KB Output is correct
7 Correct 156 ms 30060 KB Output is correct
8 Correct 157 ms 30188 KB Output is correct
9 Correct 146 ms 30188 KB Output is correct
10 Correct 151 ms 30188 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 4 ms 5356 KB Output is correct
4 Correct 156 ms 29676 KB Output is correct
5 Correct 158 ms 30060 KB Output is correct
6 Correct 146 ms 30316 KB Output is correct
7 Correct 156 ms 30060 KB Output is correct
8 Correct 157 ms 30188 KB Output is correct
9 Correct 146 ms 30188 KB Output is correct
10 Correct 151 ms 30188 KB Output is correct
11 Correct 17 ms 5996 KB Output is correct
12 Correct 162 ms 30188 KB Output is correct
13 Correct 160 ms 30188 KB Output is correct
14 Correct 157 ms 30148 KB Output is correct
15 Correct 159 ms 30188 KB Output is correct
16 Correct 153 ms 30116 KB Output is correct
17 Correct 155 ms 30060 KB Output is correct
18 Correct 157 ms 30060 KB Output is correct
19 Correct 149 ms 30280 KB Output is correct
20 Correct 159 ms 30060 KB Output is correct

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 644 ms 21412 KB Output is correct
2 Correct 148 ms 32108 KB Output is correct
3 Execution timed out 1101 ms 29036 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# 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 4 ms 5100 KB Output is correct
4 Correct 4 ms 5228 KB Output is correct
5 Correct 147 ms 21100 KB Output is correct
6 Correct 75 ms 28780 KB Output is correct
7 Correct 137 ms 26092 KB Output is correct
8 Correct 104 ms 21100 KB Output is correct
9 Incorrect 159 ms 24428 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# 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 4 ms 5100 KB Output is correct
4 Correct 4 ms 5228 KB Output is correct
5 Correct 147 ms 21100 KB Output is correct
6 Correct 75 ms 28780 KB Output is correct
7 Correct 137 ms 26092 KB Output is correct
8 Correct 104 ms 21100 KB Output is correct
9 Incorrect 159 ms 24428 KB Output isn't correct
10 Halted 0 ms 0 KB -