제출 #545086

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
545086		Soul234	Ferries (NOI13_ferries)	C++14	40 / 40	234 ms	20168 KiB

ferries

#include<bits/stdc++.h>
using namespace std;

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

const int MX = 1e5+5;
int N, M;
vi adj[MX];
V<ll> Ws[MX];
ll d[MX];

tcT> bool ckmin(T&a, const T&b) {
    return b < a ? a = b, 1 : 0;
}

void solve() {
    cin>>N>>M;
    F0R(i,M) {
        ll u,v,c; cin>>u>>v>>c;
        adj[v].pb(u);
        Ws[u].pb(c);
    }
    FOR(i,1,N+1) sort(all(Ws[i]));
    pqg<pair<ll,int>> pq;
    memset(d, 0x3f, sizeof d);
    pq.push({d[N] = 0, N});
    while(sz(pq)) {
        ll du = pq.top().first; int u = pq.top().second;
        pq.pop();
        if(du != d[u]) continue;
        each(v, adj[u]) {
            if(ckmin(d[v], d[u] + Ws[v].back())) {
                pq.push({d[v], v});
            }
            Ws[v].pop_back();
        }
    }
    cout << d[1] << nl;
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

ferries.cpp: In function 'void setIO(std::string)':
ferries.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ferries.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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