結果

問題 No.3013 ハチマキ買い星人
ユーザー soto800
提出日時 2025-01-25 12:53:38
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 445 ms / 2,000 ms
コード長 5,095 bytes
コンパイル時間 2,443 ms
コンパイル使用メモリ 211,748 KB
実行使用メモリ 23,164 KB
最終ジャッジ日時 2025-01-25 22:35:44
合計ジャッジ時間 14,305 ms
ジャッジサーバーID
(参考情報)
judge9 / judge11
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1
other AC * 45
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
#define lli long long int
#define REP(i, s, n) for (lli i = s; i < n; i++)
#define INF (1LL << 62)
#define mp(a, b) make_pair(a, b)
#define SORT(V) sort(V.begin(), V.end())
#define PI (3.141592653589794)
#define TO_STRING(VariableName) #VariableName
#define LOG1(x) \
if (DEBUG) \
cout << TO_STRING(x) << "=" << x << " " << endl;
#define LOG2(x, y) \
if (DEBUG) \
cout << TO_STRING(x) << "=" << x << " " << TO_STRING(y) << "=" << y << endl;
#define LOG3(x, y, z) \
if (DEBUG) \
cout << TO_STRING(x) << "=" << x << " " << TO_STRING(y) << "=" << y << " " \
<< TO_STRING(z) << "=" << z << endl;
#define LOG4(w, x, y, z) \
if (DEBUG) \
cout << TO_STRING(w) << "=" << w << " " << TO_STRING(x) << "=" << x << " " \
<< TO_STRING(y) << "=" << y << " " << TO_STRING(z) << "=" << z \
<< endl;
#define LOG5(w, x, y, z, a) \
if (DEBUG) \
cout << TO_STRING(w) << "=" << w << " " << TO_STRING(x) << "=" << x << " " \
<< TO_STRING(y) << "=" << y << " " << TO_STRING(z) << "=" << z << " " \
<< TO_STRING(a) << "=" << a << endl;
#define LOG6(w, x, y, z, a, b) \
if (DEBUG) \
cout << TO_STRING(w) << "=" << w << " " << TO_STRING(x) << "=" << x << " " \
<< TO_STRING(y) << "=" << y << " " << TO_STRING(z) << "=" << z << " " \
<< TO_STRING(a) << "=" << a << " " << TO_STRING(b) << "=" << b \
<< endl;
#define overload6(a, b, c, d, e, f, g, ...) g
#define LOG(...) \
overload6(__VA_ARGS__, LOG6, LOG5, LOG4, LOG3, LOG2, LOG1)(__VA_ARGS__)
template <class T> bool chmax(T &a, const T &b) {
if (a < b) {
a = b;
return 1;
}
return 0;
}
template <class T> bool chmin(T &a, const T &b) {
if (b < a) {
a = b;
return 1;
}
return 0;
}
mt19937 engine;
std::chrono::system_clock::time_point start, endTime;
#define DEBUG 0
/* dijkstra(G,s,dis,prev)
G, s, dis, prev
O(|E|log|V|)
dis, prev
*/
struct Edge {
long long to;
long long cost;
};
using Graph = vector<vector<Edge>>;
using P = pair<long, int>;
const long long INFL = 1LL << 60;
void dijkstra(const Graph &G, int s, vector<long long> &dis,
vector<int> &prev) {
int N = G.size();
dis.resize(N, INFL);
prev.resize(N, -1); //
priority_queue<P, vector<P>, greater<P>> pq;
dis[s] = 0;
pq.emplace(dis[s], s);
while (!pq.empty()) {
P p = pq.top();
pq.pop();
int v = p.second;
if (dis[v] < p.first) {
continue;
}
for (auto &e : G[v]) {
if (dis[e.to] > dis[v] + e.cost) {
dis[e.to] = dis[v] + e.cost;
prev[e.to] = v; // v e.to
pq.emplace(dis[e.to], e.to);
}
}
}
}
/* get_path(prev, t)
dijkstra prev, t
t
*/
vector<int> get_path(const vector<int> &prev, int t) {
vector<int> path;
for (int cur = t; cur != -1; cur = prev[cur]) {
path.push_back(cur);
}
reverse(path.begin(), path.end()); //
return path;
}
void solve() {
// write your code here
//
//
lli N, M, P, Y;
cin >> N >> M >> P >> Y;
Graph graph(N);
REP(i, 0, M) {
lli a, b, c;
cin >> a >> b >> c;
a--;
b--;
graph[a].push_back({b, c});
graph[b].push_back({a, c});
}
vector<lli> D(P), E(P);
REP(i, 0, P) {
cin >> D[i] >> E[i];
D[i]--;
}
vector<lli> dis;
vector<int> prev;
dijkstra(graph, 0, dis, prev);
lli ans = 0;
REP(i, 0, P) {
lli les = Y - dis[D[i]];
if (les <= 0) {
continue;
}
chmax(ans, les / E[i]);
}
cout << ans << endl;
}
// Generated by 2.13.0 https://github.com/kyuridenamida/atcoder-tools (tips:
// You use the default template now. You can remove this line by using your
// custom template)
int main() {
// Failed to predict input format
lli N = 1;
// cin >> N;
while (N--)
solve();
return 0;
}
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