제출 #884031

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
884031		nasam	Commuter Pass (JOI18_commuter_pass)	C++17	31 / 100	216 ms	17612 KiB

commuter_pass

/*************************************
*       author: Pham Huy Khanh       *
*************************************/
#include <bits/stdc++.h>
#define ll long long
#define FOR(i,a,b) for (int i = (a), _b = (b); i <= _b; i++)
#define FOD(i,b,a) for (int i = (b), _a = (a); i >= _a; i--)
#define ALL(v) (v).begin(), (v).end()
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(i) (1LL << (i))
#define CNTBIT(x) __builtin_popcount(x)
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define left ___left
#define right ___right
#define pii pair<int, int>
#define DEBUG(n, a) FOR (i, 1, n) cout << a[i] << ' '; cout << endl;
#define endl "\n"

using namespace std;

template<class X, class Y> bool maximize(X &x, Y y){ if (x < y){ x = y; return true; } return false; }
template<class X, class Y> bool minimize(X &x, Y y){ if (x > y){ x = y; return true; } return false; }

#define  gogobruhbruh  ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define  file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }

const int MOD = 1e9 + 7;

void add(ll &a, ll b){ if ((a += b) >= MOD) a -= MOD; }
void sub(ll &a, ll b){ if ((a -= b) < 0) a += MOD; }
int muti(int a, int b){ return 1LL * a * b % MOD; }
int Pow(int a, int b){ int res = 1; for (; b; b >>= 1, a = muti(a, a)) if (b & 1) res = muti(res, a); return res; }

const int MAX = 1e5 + 7;
const int INF = 1e9 + 7;

int numNode, numEdge, s, t, a, b;
vector<pii> edge[MAX];
ll dis[MAX][4];
priority_queue<pair<ll, int>> heap;

void pfs(int u, int i){
    dis[u][i] = 0;
    heap.push({0, u});
    while (heap.size()){
        auto [cur, u] = heap.top(); heap.pop();
        if (-cur > dis[u][i])
            continue;
        for (auto [v, cost] : edge[u]){
            if (i > 1 && dis[u][i - 2] + dis[v][(i - 2) ^ 1] + cost == dis[t][0])
                cost = 0;
            if (minimize(dis[v][i], dis[u][i] + cost))
                heap.push({-dis[v][i], v});
        }
    }
}

void solve(){
    memset(dis, 0x3f, sizeof(dis));
    pfs(s, 0); pfs(t, 1); pfs(a, 2); pfs(a, 3);
    cout << min(dis[b][2], dis[b][3]);
}

void read(){
    cin >> numNode >> numEdge >> s >> t >> a >> b;
    FOR (i, 1, numEdge){
        static int u, v, cost;
        cin >> u >> v >> cost;
        edge[u].eb(pii(v, cost));
        edge[v].eb(pii(u, cost));
    }
}

int main(){
    gogobruhbruh;
    file("main");
    int test = 1;
    // cin >> test;
    while (test--)
        read(),
        solve();
}

컴파일 시 표준 에러 (stderr) 메시지

commuter_pass.cpp: In function 'int main()':
commuter_pass.cpp:28:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 | #define  file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:79:5: note: in expansion of macro 'file'
   79 |     file("main");
      |     ^~~~
commuter_pass.cpp:28:95: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 | #define  file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                                                       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:79:5: note: in expansion of macro 'file'
   79 |     file("main");
      |     ^~~~

• Subtask 1: 16 / 16
• Subtask 2: 15 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45