oj.uz

답안 #714745

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
714745 2023-03-25T08:59:49 Z ajab_01 Toll (BOI17_toll) C++17
0 / 100
 31 ms 5168 KB 
#include<bits/stdc++.h>
using namespace std;

const int INF = 1e9 + 9;
const int N = 1e5 + 5;
const int O = 3e3 + 3;
vector<pair<int , int> > g[N] , query;
priority_queue<pair<int , int> > pq;
vector<int> vec;
int dp[N][O] , ind[N] , val[N] , pre[N] , pr[N] , k , n , m , o;
bool mark[N] , vis[N] , ch = 1;

void dijkstra(){
	val[0] = 0;
	pq.push({0 , 0});
	while(!pq.empty()){
		int v = pq.top().second;
		pq.pop();
		if(vis[v]) continue;
		vis[v] = 1;
		for(auto i : g[v]){
			int u = i.first , w = i.second;
			if(val[u] > val[v] + w){
				val[u] = val[v] + w;
				pq.push({-val[u] , u});
			}
		}
	}
}

int main(){
	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	// for(int i = 0 ; i < N ; i++){
	// 	val[i] = INF;
	// 	pr[i] = -1;
	// 	for(int j = 0 ; j < O ; j++)
	// 		dp[i][j] = INF;
	// }

	cin >> k >> n >> m >> o;
	for(int i = 0 ; i < m ; i++){
		int u , v , w;
		cin >> u >> v >> w;
		g[u].push_back({v , w});
	}

	for(int i = 0 ; i < o ; i++){
		int a , b;
		cin >> a >> b;
		query.push_back({a , b});
		if(a) ch = 0;
		if(mark[b]) continue;
		vec.push_back(b);
		ind[b] = (int)vec.size() - 1;
		mark[b] = 1;
	}

	if(k == 1){
		int bef = 0;
		for(int i = 0 ; i < n ; i++){
			if(i == bef)
				pre[i] = 0;
			else
				pre[i] = pre[i - 1] + g[i - 1][0].second;
			pr[i] = bef;
			if(!g[i].size()){
				while(!g[i].size())i++;
				bef = i;
				i--;
			}
		}
		for(auto i : query){
			if(pr[i.first] == -1 || pr[i.second] == -1 || pr[i.first] != pr[i.second] || i.second < i.first)
				cout << -1 << '\n';
			else
				cout << pre[i.second] - pre[i.first] << '\n';
		}
		return 0;
	}

	if(ch){
		dijkstra();
		for(auto i : query){
			if(val[i.second] == INF)
				cout << -1 << '\n';
			else
				cout << val[i.second] << '\n';
		}
		return 0;
	}

	if(o <= 3000){
		int sz = (int)vec.size();
		for(int i = 0 ; i < sz ; i++)
			dp[vec[i]][i] = 0;

		for(int v = n - 1 ; v >= 0 ; v--)
			for(int j = 0 ; j < sz ; j++)
				for(auto u : g[v])
					dp[v][j] = min(dp[v][j] , dp[u.first][j] + u.second);

		for(auto i : query){
			int a = i.first , b = i.second;
			if(dp[a][ind[b]] == INF)
				cout << -1 << '\n';
			else
				cout << dp[a][ind[b]] << '\n';
		}
		return 0;
	}
	cout << "jalebe" << '\n';
	return 0;
}

Subtask #1
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 5168 KB Output is correct
2 Incorrect 1 ms 2644 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 31 ms 4684 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Incorrect 2 ms 2644 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Incorrect 2 ms 2644 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 5168 KB Output is correct
2 Incorrect 1 ms 2644 KB Output isn't correct
3 Halted 0 ms 0 KB -