제출 #1087820

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1087820		JanPham	Commuter Pass (JOI18_commuter_pass)	C++17	0 / 100	2071 ms	262144 KiB

commuter_pass

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define fi first
#define se second
#define TranLeThanhTam "TranLeThanhTam"
#define all(v) v.begin(),v.end()
#define reset(a,i) memset(a,i,sizeof(a))
#define FOR(i,a,b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i,a,b) for (int i = (a), _b = (b); i >= _b; --i)
#define compact(v) sort(all(v)), v.erase(unique(all(v)), end(v))
#define sz(v) (int) v.size()
#define MASK(i) (1 << (i))

typedef long long ll;
typedef long double lb;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;

const int Thanh_Tam = 1e5 + 17;
const int inf = 1e9 + 17;
const long long infll = 1e18 + 17;
const int MOD = 1e9 + 7;
const int Log = 17;
const int dx[4] = {-1, 0, 0, 1};
const int dy[4] = {0, -1, 1, 0};
const int max_block_size = 270;
const ll P = 311;
const int maxA = 1e6 + 17;
const int addi = 1e9;
const char dir[4] = {'W', 'S', 'N', 'E'};
const int Mod[3] = {998244353, MOD, 759186269};

ll mul(ll a, ll b, ll mod);
ll binpow(ll a, ll b, ll mod)
{
    ll res = 1;
    while (b > 0)
    {
        if (b & 1) res = mul(res,a,mod);
        b >>= 1;
        a = mul(a,a,mod);
    }
    return res;
}
ll add(ll a, ll b, ll mod) { return (a + b) % mod;                 }
ll sub(ll a, ll b, ll mod) { return (a - b + mod) % mod;          }
ll mul(ll a, ll b, ll mod) { return ((a % mod) * (b % mod)) % mod; }
ll div(ll a, ll b, ll mod) { return mul(a, binpow(b, mod - 2, mod), mod); }

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand_range(ll l, ll r){return uniform_int_distribution<ll>(l, r)(rng);}

int n,m,S,T,U,V;
ll distS[Thanh_Tam], distT[Thanh_Tam], distU[Thanh_Tam], distV[Thanh_Tam];
vector<pii> adj[Thanh_Tam];

void bfs(int x, ll dis[])
{
    priority_queue<pll> pq;
    pq.push({x,0});
    FOR(i,1,n) dis[i] = infll;

    while (!pq.empty())
    {
        int u = pq.top().fi; ll val = pq.top().se;
        pq.pop();
        if (dis[u] < val) continue;
        dis[u] = val;
        for (pll v : adj[u]) pq.push({v.fi, v.se + dis[u]});
    }
    return;
}

ll dp[2][Thanh_Tam], best = 4e18;
bool vis[Thanh_Tam];

void dfs(int u) 
{
    vis[u] = true;
    dp[0][u] = dp[1][u] = 4e18;

    for (pll v: adj[u]) 
    {
        if (distS[u] + distT[v.fi] + v.se != distS[T]) continue;
        if (!vis[v.fi]) dfs(v.fi);
        dp[0][u] = min(dp[0][u], dp[0][v.fi]);
        dp[1][u] = min(dp[1][u], dp[1][v.fi]);
    }

    best = min(best, distU[u] + dp[1][u]);
    best = min(best, distV[u] + dp[0][u]);

    dp[0][u] = min(dp[0][u], distU[u]);
    dp[1][u] = min(dp[1][u], distV[u]);

    return;
}


void ThanhTam()
{
    cin >> n >> m >> S >> T >> U >> V;
    FOR(i,1,m)
    {
        int u,v,w;
        cin >> u >> v >> w;
        adj[u].pb({v,w});
        adj[v].pb({u,w});
    }

    bfs(S, distS);
    bfs(T, distT);
    bfs(U, distU);
    bfs(V, distV);

    best = distV[U];
    dfs(S);
    cout << best;
    return; 
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    if (fopen(TranLeThanhTam".inp","r"))
    {
        freopen(TranLeThanhTam".inp","r",stdin);
        freopen(TranLeThanhTam".out","w",stdout);
    }   

    int t = 1;
    //cin >> t;
    while (t--)
        ThanhTam();

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

commuter_pass.cpp: In function 'int main()':
commuter_pass.cpp:133:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  133 |         freopen(TranLeThanhTam".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:134:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |         freopen(TranLeThanhTam".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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