結果

問題 No.3013 ハチマキ買い星人
コンテスト
ユーザー みやべ
提出日時 2025-01-25 17:25:49
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 225 ms / 2,000 ms
コード長 7,409 bytes
コンパイル時間 6,117 ms
コンパイル使用メモリ 428,688 KB
実行使用メモリ 25,100 KB
最終ジャッジ日時 2025-01-25 23:58:18
合計ジャッジ時間 13,017 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
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 # 

#ifdef sys
#define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>
using namespace std;

using ull = unsigned long long;
using ll = long long;
using ld = long double;
using lll = __int128;
using llld = _Float128;
#define el "\n"
#define all(x) x.begin(), x.end()
#define initv2(t,a,...) a, vector<t>(__VA_ARGS__)
#define initv3(t,a,b,...) a, vector<vector<t>>(b, vector<t>(__VA_ARGS__))
#define pair(a,b) pair<a, b>
#define COUNT(a,b) count_if(a, [&](auto _Cx){return _Cx b;})
#define vec vector
#define elif else if

namespace Myb{
    long long LLINF = 1010101010101010101;
    int INF = 1010101010;
    
    namespace Myb_ios{
        template<typename T, typename U>
        istream& operator>>(istream& ist, pair<T, U>& p) {cin >> p.first >> p.second; return ist;}
        template<typename T>
        istream& operator>>(istream& ist, vector<T>& v) {for(T& i : v) cin >> i; return ist;}
        istream& operator>>(istream& ist, _Float128& x) {long double n; cin >> n; x = n; return ist;}
        void read_d_graph(vector<vector<pair<long long, int>>>& v, int m, int num = -1){
            int a, b; long long c;
            for(int _ = 0; _ < m; _++){
                cin >> a >> b >> c;
                a += num; b += num;
                v[a].emplace_back(c, b);
            } return;
        }
        void read_d_graph(vector<vector<int>>& v, int m, int num = -1){
            int a, b;
            for(int _ = 0; _ < m; _++){
                cin >> a >> b;
                a += num; b += num;
                v[a].emplace_back(b);
            } return;
        }
        void read_ud_graph(vector<vector<pair<long long, int>>>& v, int m, int num = -1){
            int a, b; long long c;
            for(int _ = 0; _ < m; _++){
                cin >> a >> b >> c;
                a += num; b += num;
                v[a].emplace_back(c, b);
                v[b].emplace_back(c, a);
            } return;
        }
        void read_ud_graph(vector<vector<int>>& v, int m, int num = -1){
            int a, b;
            for(int _ = 0; _ < m; _++){
                cin >> a >> b;
                a += num; b += num;
                v[a].emplace_back(b);
                v[b].emplace_back(a);
            } return;
        }
        template<typename T>
        void read_multi(T& v, int n) {}
        template<typename T, typename... U>
        void read_multi(T& v, int n, U&&... args){
            if(n >= v.size()) read_multi(args...);
            else {
                cin >> v[n];
                read_multi(args..., v, n+1);
            }
        }
        string input() {string res; cin >> res; return res;}
        long long inputl() {long long res; cin >> res; return res;}
        template<typename T, typename U>
        ostream& operator<<(ostream& ost, const pair<T, U> p) {cerr << "{"; ost << p.first << " " << p.second; cerr << "}"; return ost;}
        template<typename T>
        ostream& operator<<(ostream& ost, const vector<T>& v) {for(int i = 0; i < v.size(); i++) {if(i) ost << " "; ost << v[i];} return ost;}
        template<typename T>
        ostream& operator<<(ostream& ost, const vector<vector<T>>& v) {for(int i = 0; i < v.size(); i++) {if(i) ost << "\n"; ost << v[i];} return ost;}
    } using namespace Myb_ios;
    
    long long add_each(long long n) {return n;}
    template<typename T, typename... U>
    void add_each(long long n, vector<T>& v, U&... args) {
        for(auto& i : v) i += n;
        add_each(n, args...);
    }
    
    template<typename T, typename U> bool chmin(T& a, U b) {if(a > b){a = b; return true;} return false;}
    template<typename T, typename U> bool chmax(T& a, U b) {if(a < b){a = b; return true;} return false;}
    template<typename T> T minv(const vector<T>& v) {return *min_element(v.begin(), v.end());}
    template<typename T> T maxv(const vector<T>& v) {return *max_element(v.begin(), v.end());}
    
    long long power(long long val, long long num, long long mod = LLONG_MAX){
        assert(mod > 0); assert(num >= 0);
        val %= mod;
        long long res = 1;
        if(mod < INT_MAX || mod == LLONG_MAX){
            while(num){
                if(num&1) res = (res*val)%mod;
                val = (val*val)%mod;
                num >>= 1;
            }
        } else {
            while(num){
                if(num&1) res = (__int128(res)*val)%mod;
                val = (__int128(val)*val)%mod;
                num >>= 1;
            }
        }
        return res;
    }
    
    long long comb(long long N, long long K, int mod = 0){
        const int COMBSIZ = 200000;
        assert(mod >= 0);
        if(N < K || K < 0) return 0;
        static vector<long long> combf(COMBSIZ+9, -1);
        long long res;
        if(mod != 0){
            assert(N <= COMBSIZ);
            if(combf[0] == -1){
                combf[0] = 1;
                for(long long i = 1; i <= COMBSIZ; i++) combf[i] = (combf[i-1]*i)%mod;
            }
            res = (combf[N]*power((combf[N-K]*combf[K])%mod, mod-2, mod))%mod;
            return res;
        } else {
            long long a=1, b=1;
            K = min(K, N-K);
            for(long long i = N; i > N-K; i--) a *= i;
            for(long long i = 2; i <= K; i++) b *= i;
            return a/b;
        }
    }
} using namespace Myb;

#if __has_include(<atcoder/all>)
#include <atcoder/modint>
using namespace atcoder;
using mint9 = modint998244353;
using mint1 = modint1000000007;
ostream& operator<<(ostream& ost, const mint1& x) {ost << x.val(); return ost;}
ostream& operator<<(ostream& ost, const mint9& x) {ost << x.val(); return ost;}
ostream& operator<<(ostream& ost, const modint& x) {ost << x.val(); return ost;}
#endif
/*vvv^vvvv^vvvvv^^^^^^^^^vv^^^^^^vvvvv^^^vvvvv^^^^^^^^vvvvvvvvv^^^^^^^vvvvvvvvv^^^vv^^^vvvvvvvv^^^^vvvvvv^^vvvvvv^^^^vvv^^^vvvvvvvv^^^vv^^^^^^^vvvvvvvvv^^^^^_^^vvvvvvvv^^^^^^^^vvvv^vvvvvvvvv^^^^^^^v*/



signed main(){
    ios::sync_with_stdio(0); cin.tie(0);
    
    int n, m, p, u, v;
    ll y, c;
    cin >> n >> m >> p >> y;
    vec<vec<pair<ll, int>>> G(n);
    map<pair<int, int>, ll> M;
    for(int i = 0; i < m; i++){
        cin >> u >> v >> c;
        u--; v--;
        G[u].emplace_back(c, v);
        G[v].emplace_back(c, u);
    }
    vec<ll> S(n, LLINF);
    for(int i = 0; i < p; i++){
        cin >> u >> c;
        u--;
        chmin(S[u], c);
    }
    
    auto dijkstra = [](const vector<vector<pair<long long, int>>>& v, const vector<int>& s){
        int siz = v.size();
        vector<long long> dist(siz, LLINF);
        vector<int> path(siz, -1);
        priority_queue<pair<long long, int>, vector<pair<long long, int>>, greater<pair<long long, int>>> pq;
        for(int i : s){
            dist[i] = 0;
            pq.emplace(0, i);
        }
        while(!pq.empty()){
            auto [d, pos] = pq.top();
            pq.pop();
            if(d > dist[pos]) continue;
            for(auto [cost, nex] : v[pos]){
                long long nex_cost = dist[pos] + cost;
                if(dist[nex] > nex_cost){
                    dist[nex] = nex_cost;
                    pq.emplace(dist[nex], nex);
                    path[nex] = pos;
                }
            }
        }
        return make_pair(dist, path);
    };
    
    auto dist = dijkstra(G, {0}).first;
    
    ll ans = 0;
    for(int i = 0; i < n; i++){
        chmax(ans, (y-dist[i])/S[i]);
    }
    cout << ans << el;
}
0