Submission #495176

#	Time	Username	Problem	Language	Result	Execution time	Memory
495176		ergagan	Evacuation plan (IZhO18_plan)	C++17	22 / 100	1881 ms	487476 KiB

plan

//я так много думал, что опять попал
#include <bits/stdc++.h>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ppb pop_back
#define pf push_front
#define ppf pop_front
#define f first
#define s second
#define left(v) v + v
#define right(v) v + v + 1
#define ub upper_bound
#define lb lower_bound

using namespace std;
typedef long long ll;

//17 SEVENTEEN
const long double Pi = acos(-1.0);
const ll dx[] = {0,0,1,-1};
const ll dy[] = {1,-1,0,0};
const ll N = (ll) 1e6 + 17;
const ll M = (ll) 5e3 + 69;
const ll inf = (ll) 1e18 + 3;
const ll mod = (ll) 1e9 + 7;
ll sq(ll x) { return x * x; }

ll zxc = 1, mal[N];
ll n, m, k, q, u, v, w;
ll a, b, x, used[N], d[M][M];

vector<ll> g[N];

bool gay(ll v, ll x) {
    for(ll i = 1; i <= k; i++) {
        if(d[v][mal[i]] < x) return 0;
    }
    return 1;
}

void dfs(ll v, ll x) {
    used[v] = 1;
    for(ll to : g[v]) {
        if(!used[to] && gay(to, x)) dfs(to, x);
    }
}

ll check(ll x) {
    for(ll i = 1; i <= n; i++) used[i] = 0;
    if(gay(a, x)) dfs(a, x);
    return used[b];
}

void solve() {

    cin >> n >> m;

    for(ll i = 1; i <= n; i++) {
        for(ll j = 1; j <= n; j++) {
            if(i != j) d[i][j] = inf;
        }
    }

    for(ll i = 1; i <= m; i++) {
        cin >> u >> v >> w;
        d[u][v] = w, d[v][u] = w;
        g[u].pb(v), g[v].pb(u);
    }

    cin >> k;
    for(ll i = 1; i <= k; i++) {
        cin >> mal[i];
    }

    for(ll k = 1; k <= n; k++)
        for(ll i = 1; i <= n; i++)
            for(ll j = 1; j <= n; j++)
                if(d[i][k] < inf && d[k][j] < inf)
                    d[i][j] = min(d[i][j], d[i][k] + d[k][j]);

//    for(ll i = 1; i <= n; i++) {
//        for(ll j = 1; j <= n; j++) {
//            cout << d[i][j] << " ";
//        }
//        cout << "\n";
//    }

    cin >> q;
    while(q--) {
        cin >> a >> b;
        ll l = 0, r = inf;
        while(l < r) {
            ll m = (l + r + 1) / 2;
            if(check(m)) l = m;
            else r = m - 1;
        }
        cout << l << "\n";
    }
}

/*

9 12
1 9 4
1 2 5
2 3 7
2 4 3
4 3 6
3 6 4
8 7 10
6 7 5
5 8 1
9 5 7
5 4 12
6 8 2
2
4 7
5
1 6
5 3
4 8
5 8
1 5

*/

int main(/*Уверенно*/) {
ios_base::sync_with_stdio(0);
    cin.tie(0);
/*
	freopen(".in", "r", stdin);
	freopen(".out", "w", stdout);
*/
//    cin >> zxc;
    while(zxc--) {
        solve();
    }
  	return 0;
}
// さよならさ いかなくちゃ

• Subtask 1: 10 / 10
• Subtask 2: 0 / 13
• Subtask 3: 12 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 46