Submission #366665

#	Time	Username	Problem	Language	Result	Execution time	Memory
366665		yrn_alf	Commuter Pass (JOI18_commuter_pass)	C++17	100 / 100	625 ms	40612 KiB

commuter_pass

#pragma GCC optimize("Ofast,unroll-loops,shrink-wrap-separate,loop-nest-optimize,inline")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma")
 
#include <bits/stdc++.h>
#include <tr1/unordered_map>
#include <tr1/unordered_set>
// #include <ext/rope>
#include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/trie_policy.hpp>
#include <ext/pb_ds/tree_policy.hpp>
 
#define IOS ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
#define mt make_tuple
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define mat vector<vector<ll>>
#define mat2 vector<vector<mat>>
#define vi vector<int>
#define vll vector<ll>
#define lll __int128_t
#define psi pair<string, int>
#define pis pair<int, string>
#define pic pair<int, char>
#define pcc pair<char, char>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define piiii pair<pii, pii>
#define mii map<int, int>
#define umii tr1::unordered_map<int, int>
#define iter set<int>::iterator
#define lb lower_bound
#define ub upper_bound
#define lg2(n) (31 - __builtin_clz(n))
#define lg2ll(n) (63 - __builtin_clzll(n))
 
#define fi first
#define se second
 
 
/*
#define fi first.first
#define se first.second
#define th second.first
#define fo second.second
*/
 
/*
#define piii pair<int, pii>
#define fi first
#define se second.fi
#define th second.second
*/
 
/*
#define piii pair<pii, int>
#define fi first.first
#define se first.th
#define th second
*/
 
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
 
using namespace std;
// using namespace __gnu_cxx;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef tree<pll, null_type, greater<pll>, rb_tree_tag, tree_order_statistics_node_update> ost;
 
const int nax = 400005, block = 320, dax = 2, lim = 2187, lgax = 25, bit = 29, mod = 1000000007, inf = 1000000007;
const ll llax = 1e18;
const ld pi = acos(0) * 2;
const double eps = 1e-6;
 
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
 
/*
const int MAX_MEM = 100000000;
int mpos;
char mem[MAX_MEM];
inline void* operator new(size_t n) {
    assert((mpos += n) <= MAX_MEM);
    return (void*)(mem + mpos - n);
}
inline void operator delete(void*) {}
*/
 
 
inline int read() {
    char c = getchar_unlocked();
    int t = 0, f = 1;
    while (!isdigit(c) && c != EOF)
        f = (c == '-' ? -1 : 1), c = getchar_unlocked();
    while (isdigit(c) && c != EOF)
        t = t * 10 + c - '0', c = getchar_unlocked();
    return t * f;
}
 
inline void read(char* s) {
    char c = getchar_unlocked();
    while (isspace(c))
        c = getchar_unlocked();
    while (!isspace(c))
        *s++ = c, c = getchar_unlocked();
    *s = '\0';
}
 
/*
struct chash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }
    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
*/
 
int n, m;
ll d[2][nax], c[nax], dp[nax];
pii e[nax];
vector<pll> g[nax];
bitset<nax> vis;
 
void dijkstra(int s, int k) {
    priority_queue<pll, vector<pll>, greater<pll>> q;
    q.push({0, s});
    fill(d[k], d[k] + nax, llax);
    d[k][s] = 0;
    while (!q.empty()) {
        ll v = q.top().se, cur_d = q.top().fi;
        q.pop();
        if (cur_d > d[k][v])
            continue;
        for (pll ch : g[v])
            if (d[k][ch.fi] > d[k][v] + max(c[ch.se], c[ch.se ^ 1]))
                q.push({d[k][ch.fi] = d[k][v] + max(c[ch.se], c[ch.se ^ 1]), ch.fi});
    }
}
 
ll dfs(int v) {
    if (vis[v])
        return dp[v];
    vis[v] = 1;
    for (pll ch : g[v])
        if (!c[ch.se])
            dp[v] = min(dp[v], dfs(ch.fi));
    return dp[v];
}
 
int main() {
    // IOS
    ll ans = llax;
    n = read(), m = read();
    int s = read(), t = read(), x = read(), y = read();
    for (int i = 0; i < 2 * m; ++i) {
        int v = read(), u = read(), w = read();
        g[v].eb(u, i), c[i] = w;
        e[i] = {v, u};
        ++i;
        g[u].eb(v, i), c[i] = w;
        e[i] = {u, v};
    }
    dijkstra(x, 0);
    ans = d[0][y];
    dijkstra(s, 0);
    dijkstra(t, 1);
    for (int j = 0; j < 2 * m; ++j) {
        if (d[0][e[j].fi] + c[j] + d[1][e[j].se] == d[0][t])
            c[j] = 0;
    }
    dijkstra(x, 0);
    dijkstra(y, 1);
    for (int i = 1; i <= n; ++i)
        dp[i] = d[1][i];
    dfs(s);
    for (int i = 1; i <= n; ++i)
        ans = min(ans, d[0][i] + dp[i]);
    vis = 0;
    dijkstra(y, 0);
    dijkstra(x, 1);
    for (int i = 1; i <= n; ++i)
        dp[i] = d[1][i];
    dfs(s);
    for (int i = 1; i <= n; ++i)
        ans = min(ans, d[0][i] + dp[i]);
    printf("%lld\n", ans);
    return 0;
}

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