結果
| 問題 |
No.872 All Tree Path
|
| コンテスト | |
| ユーザー |
uw_yu1rabbit
|
| 提出日時 | 2020-08-31 19:10:17 |
| 言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
| 結果 |
MLE
|
| 実行時間 | - |
| コード長 | 3,406 bytes |
| コンパイル時間 | 10,797 ms |
| コンパイル使用メモリ | 136,228 KB |
| 最終ジャッジ日時 | 2025-01-14 02:34:18 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | WA * 2 |
| other | WA * 6 MLE * 12 |
ソースコード
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<iostream>
#include<vector>
#include<queue>
using namespace std;
using i32 = int_fast32_t;
using i64 = int_fast64_t;
using ll = i64;
#define rep(i, n) for (i32 i = 0; i < (i32)(n); i++)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
using P = pair<i64,i64>;
ll INF = 1145141919810364;
template <typename T>
class edge
{
public:
T cost, to, from;
edge(T from, T to, T cost) : from(from), to(to), cost(cost) {}
};
template <typename T>
class Graph
{
public:
vector<vector<edge<T>>> graph;
Graph(T n, vector<T> from, vector<T> to, bool no_direction, vector<T> cost)
{
graph.resize(n);
for (int i = 0; i < from.size(); i++)
{
edge<T> params(from[i], to[i], cost[i]);
graph[from[i]].emplace_back(params);
if (no_direction)
{
swap(params.from, params.to);
graph[to[i]].emplace_back(params);
}
}
}
vector<ll> shortest_path;
void Dijkstra(ll start)
{
shortest_path.resize(graph.size(), INF);
shortest_path[start] = 0;
priority_queue<P, vector<P>, greater<P>> que;
que.emplace(0, start);
while (!que.empty())
{
P p = que.top();
que.pop();
ll v = p.second;
if (shortest_path[v] < p.first)
continue;
for (int i = 0; i < graph[v].size(); i++)
{
ll k = graph[v][i].to;
ll l = graph[v][i].cost;
if (shortest_path[k] > shortest_path[v] + l)
{
shortest_path[k] = shortest_path[v] + l;
que.push(P(shortest_path[k], k));
}
}
}
}
vector<vector<T>> Shortest_path;
void Warshall_Froyd()
{
Shortest_path.resize(graph.size(), vector<T>(graph.size(), INF));
for (int i = 0; i < graph.size(); i++)
{
for (int j = 0; j < graph[i].size(); j++)
{
ll To = graph[i][j].to;
ll Cost = graph[i][j].cost;
Shortest_path[i][To] = Cost;
}
}
for (int k = 0; k < graph.size(); k++)
{
for (int i = 0; i < graph.size(); i++)
{
for (int j = 0; j < graph.size(); j++)
{
Shortest_path[i][j] = min(Shortest_path[k][j] + Shortest_path[i][k], Shortest_path[i][j]);
}
}
}
}
vector<T> dpath(T t)
{
vector<T> path;
for (; t != INF; t = shortest_path[t])
path.emplace_back(t);
reverse(path.begin(), path.end());
return path;
}
};
int main(){
ios::sync_with_stdio(false);
std::cin.tie(nullptr);
i64 n;
cin >> n;
vector<i64> u(n - 1),v(n - 1),w(n - 1);
rep(i,n - 1){
cin >> u[i] >> v[i] >> w[i];
u[i]--;
v[i]--;
}
Graph g(n,u,v,true,w);
g.Warshall_Froyd();
i64 ans = 0;
rep(i,n){
g.Dijkstra(i);
rep(j,n){
if(i != j)ans += g.shortest_path[j];
}
}
cout << ans << endl;
}
uw_yu1rabbit