Submission #956464

#	Time	Username	Problem	Language	Result	Execution time	Memory
956464		Whisper	Ferries (NOI13_ferries)	C++17	40 / 40	194 ms	30444 KiB

ferries

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for (int i = a; i <= b; i++)
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)

constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void setupIO(){
    #define name "Whisper"
    //Phu Trong from Nguyen Tat Thanh High School for gifted student
    srand(time(NULL));
    cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    cout << fixed << setprecision(10);
}

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }

const int MAX = 2e5 + 5;
int numNode, numEdge;
vector<int> G[MAX];
priority_queue<int> cost[MAX];
int vis[MAX], F[MAX];
void Whisper(){
    cin >> numNode >> numEdge;
    for (int i = 1; i <= numEdge; ++i){
        int u, v, w; cin >> u >> v >> w;
        G[v].emplace_back(u);
        cost[u].push(w);
    }
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> q;
    q.emplace(0, numNode);
    memset(F, 0x3f, sizeof F);
    F[numNode] = 0;
    //greedy we match the minimum path with the maximum edge
    while (!q.empty()){
        int u, du; tie(du, u) = q.top(); q.pop();
        if(vis[u]) continue;
        vis[u] = 1;
        for (int&v : G[u]) {
            int w = cost[v].top(); cost[v].pop();
            if(minimize(F[v], F[u] + w)){
                q.emplace(F[v], v);
            }
        }
    }
    cout << F[1];
}


signed main(){
    setupIO();
    int Test = 1;
//    cin >> Test;
    for ( int i = 1 ; i <= Test ; i++ ){
        Whisper();
        if (i < Test) cout << '\n';
    }
}

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12