結果
| 問題 |
No.2100 [Cherry Alpha C] Two-way Steps
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2022-10-14 22:50:11 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,316 bytes |
| コンパイル時間 | 2,075 ms |
| コンパイル使用メモリ | 189,352 KB |
| 実行使用メモリ | 36,072 KB |
| 最終ジャッジ日時 | 2024-06-26 16:30:56 |
| 合計ジャッジ時間 | 9,763 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 34 WA * 14 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second
const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;
int main(){
ll n, m;
cin >> n >> m;
vector<ll> h(n);
rep(i, n) cin >> h[i];
vector<vector<ll>> G(n);
rep(i, m){
ll u, v;
cin >> u >> v;
u--; v--;
G[u].pb(v);
G[v].pb(u);
}
// cherry
vector<vector<ll>> cost1(n, vector<ll>(2, -INF));
vector<vector<bool>> check1(n, vector<bool>(2, false));
cost1[0][0] = 0;
priority_queue<tuple<ll, ll, ll>> PQ1;
PQ1.push({0, 0, 0});
while(!PQ1.empty()){
ll u = get<1>(PQ1.top());
ll isUp = get<2>(PQ1.top());
PQ1.pop();
if(check1[u][isUp]) continue;
check1[u][isUp] = true;
for(ll v : G[u]){
if(v < u) continue;
if(isUp == 0){
if(h[u] < h[v]){
if(cost1[v][1] < cost1[u][0]+(h[v]-h[u])){
cost1[v][1] = cost1[u][0]+(h[v]-h[u]);
PQ1.push({cost1[v][1], v, 1});
}
}else{
if(cost1[v][0] < cost1[u][0]){
cost1[v][0] = cost1[u][0];
PQ1.push({cost1[v][0], v, 0});
}
}
}else{
if(h[u] > h[v]){
if(cost1[v][0] < cost1[u][1]){
cost1[v][0] = cost1[u][1];
PQ1.push({cost1[v][0], v, 0});
}
}
}
}
}
// zerukoba
vector<vector<ll>> cost2(n, vector<ll>(2, -INF));
vector<vector<bool>> check2(n, vector<bool>(2, false));
cost2[n-1][0] = 0;
priority_queue<tuple<ll, ll, ll>> PQ2;
PQ2.push({0, n-1, 0});
while(!PQ2.empty()){
ll u = get<1>(PQ2.top());
ll isUp = get<2>(PQ2.top());
PQ2.pop();
if(check2[u][isUp]) continue;
check2[u][isUp] = true;
for(ll v : G[u]){
if(u < v) continue;
if(isUp == 0){
if(h[u] < h[v]){
if(cost2[v][1] < cost2[u][0]+(h[v]-h[u])){
cost2[v][1] = cost2[u][0]+(h[v]-h[u]);
PQ2.push({cost2[v][1], v, 1});
}
}else{
if(cost2[v][0] < cost2[u][0]){
cost2[v][0] = cost2[u][0];
PQ2.push({cost2[v][0], v, 0});
}
}
}else{
if(h[u] > h[v]){
if(cost2[v][0] < cost2[u][1]){
cost2[v][0] = cost2[u][1];
PQ2.push({cost2[v][0], v, 0});
}
}
}
}
}
ll che = max(cost1[n-1][0], cost1[n-1][1]);
ll zer = max(cost2[0][0], cost2[0][1]);
if(che == -INF) cout << -1 << endl;
else cout << che << endl;
if(zer == -INF) cout << -1 << endl;
else cout << zer << endl;
}