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mirror of https://git.sb/baoshuo/OI-codes.git synced 2024-11-23 18:28:47 +00:00
Baoshuo Ren 2022-10-08 21:49:59 +08:00
parent 244e3d7bbc
commit 903e14bb43
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
87 changed files with 333 additions and 0 deletions

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#include <iostream>
#include <queue>
#include <utility>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 2e5 + 5;
const long long INF = 0x3f3f3f3f3f3f3f3f;
int n, m, h[N];
long long dist[N], ans;
std::vector<std::pair<int, int>> g[N];
bool vis[N];
void dijkstra() {
std::fill_n(dist, N, INF);
std::priority_queue<
std::pair<long long, int>,
std::vector<std::pair<long long, int>>,
std::greater<>>
q;
q.emplace(0, 1);
dist[1] = 0;
while (!q.empty()) {
int u = q.top().second;
q.pop();
if (vis[u]) continue;
vis[u] = true;
for (auto e : g[u]) {
int v = e.first,
w = e.second;
if (dist[v] > dist[u] + w) {
dist[v] = dist[u] + w;
q.emplace(dist[v], v);
}
}
}
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 1; i <= n; i++) {
cin >> h[i];
}
for (int i = 1, u, v; i <= m; i++) {
cin >> u >> v;
g[u].emplace_back(v, std::max(h[v] - h[u], 0));
g[v].emplace_back(u, std::max(h[u] - h[v], 0));
}
dijkstra();
for (int i = 1; i <= n; i++) {
ans = std::max(ans, static_cast<long long>(h[1]) - h[i] - dist[i]);
}
cout << ans << endl;
return 0;
}

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