結果
問題 | No.2100 [Cherry Alpha C] Two-way Steps |
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 secondconst 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);}// cherryvector<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});}}}}}// zerukobavector<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;}