oj.uz

답안 #550712

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
550712 2022-04-18T21:26:29 Z nafis_shifat Election Campaign (JOI15_election_campaign) C++17
20 / 100
 1000 ms 53080 KB 
#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
using namespace std;
const int mxn=3e5+5;
const ll inf=1e15;
int n;

vector<int> adj[mxn];
int level[mxn] = {};
int pa[18][mxn] = {};
int in[mxn] = {};
int T = 0;
int out[mxn];
int q;
vector<tuple<int,int,int>> con[mxn];
void dfs0(int u,int prev) {
	level[u] = level[prev]+1;
	pa[0][u] = prev;
	for(int i = 1; i < 18; i++) pa[i][u] = pa[i - 1][pa[i - 1][u]];
	for(int v : adj[u]) {
		if(v == prev) continue;
		dfs0(v,u);
	}
}


int findLCA(int u,int v) {

	if(level[u] < level[v]) swap(u,v);
	int diff = level[u] - level[v];
	for(int i = 0;i < 18;i++) if((diff>>i)&1) u = pa[i][u];
	if(u == v) return u;
	for(int i = 17; i >= 0; i--) {
		if(pa[i][u] != pa[i][v]){
			u = pa[i][u];
			v = pa[i][v];
		}
	}
	return pa[0][u];
}


ll dp[mxn] = {};
ll child_sum[mxn] = {};

ll tot[18][mxn];


ll TOT(int i, int x) {
	if(tot[i][x] != -inf) return tot[i][x];
	return TOT(i - 1, x) + TOT(i - 1, pa[i - 1][x]);
}
ll get(int x, int dif) {
	ll sum = 0;

	for(int i = 17; i >= 0; i--) {
		if((dif >> i) & 1) {
			sum += TOT(i, x);
			x = pa[i][x];
		}
	}
	return sum;

}
void dfs(int u, int prev) {

	for(int v : adj[u]) {
		if(v == prev) continue;
		dfs(v, u);
		child_sum[u] += dp[v];
	}
	dp[u] = child_sum[u];

	for(auto [a, b, c] : con[u]) {
		dp[u] = max(dp[u], get(a, level[a] - level[u]) + get(b, level[b] - level[u]) + c + child_sum[u]);
	}

	tot[0][u] = child_sum[u] - dp[u];

	
}
int main() {
	cin >> n;
	for(int i = 1; i < n; i++) {
		int u, v;
		scanf("%d%d", &u, &v);
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	dfs0(1, 0);

	for(int i = 0; i < 18; i++) for(int j = 1; j <= n; j++) tot[i][j] = -inf;

	cin >> q;
	for(int i = 1; i <= q; i++) {
		int a, b, c;
		scanf("%d%d%d", &a, &b, &c);
		con[findLCA(a, b)].push_back({a, b, c});
	}

	dfs(1, 0);

	cout<<dp[1]<<endl;




	
}

Compilation message

election_campaign.cpp: In function 'int main()':
election_campaign.cpp:87:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |   scanf("%d%d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~
election_campaign.cpp:98:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |   scanf("%d%d%d", &a, &b, &c);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 14676 KB Output is correct
2 Correct 8 ms 14676 KB Output is correct
3 Correct 7 ms 14576 KB Output is correct
4 Correct 8 ms 14940 KB Output is correct
5 Correct 85 ms 40988 KB Output is correct
6 Correct 53 ms 48664 KB Output is correct
7 Correct 105 ms 46004 KB Output is correct
8 Correct 97 ms 40596 KB Output is correct
9 Correct 86 ms 44332 KB Output is correct
10 Correct 75 ms 40636 KB Output is correct

Subtask #2
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 14676 KB Output is correct
2 Correct 7 ms 14676 KB Output is correct
3 Correct 9 ms 14932 KB Output is correct
4 Execution timed out 1080 ms 50416 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #3
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 14676 KB Output is correct
2 Correct 7 ms 14676 KB Output is correct
3 Correct 9 ms 14932 KB Output is correct
4 Execution timed out 1080 ms 50416 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 173 ms 42504 KB Output is correct
2 Execution timed out 1091 ms 53080 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 14676 KB Output is correct
2 Correct 8 ms 14676 KB Output is correct
3 Correct 7 ms 14576 KB Output is correct
4 Correct 8 ms 14940 KB Output is correct
5 Correct 85 ms 40988 KB Output is correct
6 Correct 53 ms 48664 KB Output is correct
7 Correct 105 ms 46004 KB Output is correct
8 Correct 97 ms 40596 KB Output is correct
9 Correct 86 ms 44332 KB Output is correct
10 Correct 75 ms 40636 KB Output is correct
11 Correct 9 ms 14932 KB Output is correct
12 Correct 11 ms 14996 KB Output is correct
13 Correct 9 ms 14932 KB Output is correct
14 Correct 10 ms 14936 KB Output is correct
15 Correct 9 ms 14920 KB Output is correct
16 Correct 10 ms 14928 KB Output is correct
17 Correct 9 ms 14876 KB Output is correct
18 Correct 9 ms 14932 KB Output is correct
19 Correct 9 ms 14928 KB Output is correct
20 Correct 10 ms 14932 KB Output is correct

Subtask #6
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 14676 KB Output is correct
2 Correct 8 ms 14676 KB Output is correct
3 Correct 7 ms 14576 KB Output is correct
4 Correct 8 ms 14940 KB Output is correct
5 Correct 85 ms 40988 KB Output is correct
6 Correct 53 ms 48664 KB Output is correct
7 Correct 105 ms 46004 KB Output is correct
8 Correct 97 ms 40596 KB Output is correct
9 Correct 86 ms 44332 KB Output is correct
10 Correct 75 ms 40636 KB Output is correct
11 Correct 8 ms 14676 KB Output is correct
12 Correct 7 ms 14676 KB Output is correct
13 Correct 9 ms 14932 KB Output is correct
14 Execution timed out 1080 ms 50416 KB Time limit exceeded
15 Halted 0 ms 0 KB -