Submission #792508

#	Time	Username	Problem	Language	Result	Execution time	Memory
792508		vjudge1	Two Currencies (JOI23_currencies)	C++14	0 / 100	2 ms	2644 KiB

currencies

#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std ;
const ll N = 1e5 ;
bool flag1 ;
ll n, m, q, p[N + 1], c[N + 1], ind[N + 1], pw[2 * N + 1], dist1[N + 1], dist[N + 1] ;
pair<ll, ll> mn[2 * N + 1][20] ;
vector<pair<pair<ll, ll>, ll>> road ;
vector<pair<ll, ll>> v1, v[N + 1] ;
void dfs_for_st(ll city, ll last)
{
    ind[city] = v1.size() ;
    v1.push_back({city, dist1[city]}) ;
    for(auto i : v[city])
    {
        if(i.fi == last)
            continue ;
        dist[i.fi] = dist[city] + i.se ;
        dist1[i.fi] = dist1[city] + 1 ;
        dfs_for_st(i.fi, city) ;
        v1.push_back({city, dist1[city]}) ;
    }
}
void build_sparce_table()
{
    for(ll i = 2 ; i <= (ll)v1.size() ; i++)
        pw[i] = pw[i / 2] + 1 ;
    for(ll i = 0 ; i < (ll)v1.size() ; i++)
        mn[i][0] = v1[i] ;
    for(ll i = 1 ; i < 20 ; i++)
        for(ll j = 0 ; j <= (ll)v1.size() - (1 << i) ; j++)
            mn[j][i] = min(mn[j][i - 1], mn[j + (1 << (i - 1))][i - 1]) ;
}
ll get_lca(ll a, ll b)
{
    a = ind[a] ;
    b = ind[b] ;
    if(a > b)swap(a, b) ;
    ll num = pw[b - a + 1] ;
    return min(mn[a][num], mn[b - (1 << num) + 1][num]).se ;
}
ll get_dist(ll a, ll b)
{
    ll lc = get_lca(a, b) ;
    return dist[a] + dist[b] - dist[lc] * 2 ;
}
signed main()
{
    ios_base::sync_with_stdio( 0 ) ;
    cin.tie( 0 ) ;
    cout.tie( 0 ) ;
    cin >> n >> m >> q ;
    for(ll i = 1 ; i < n ; i++)
    {
        ll a, b ;
        cin >> a >> b ;
        road.push_back({{a, b}, 0}) ;
    }
    for(ll i = 1 ; i <= m ; i++)
    {
        cin >> p[i] >> c[i] ;
        if(c[i] != c[1])
            flag1 = 1 ;
    }
//    if(n <= 2000 && m <= 2000 && q <= 2000)
//    {
//        return 0 ;
//    }
    if(!flag1)
    {
        for(ll i = 1 ; i <= m ; i++)
            road[p[i] - 1].se += c[i] ;
        for(auto i : road)
            v[i.fi.fi].push_back({i.fi.se, i.se}), v[i.fi.se].push_back({i.fi.fi, i.se}) ;
        dfs_for_st(1, 0) ;
        build_sparce_table() ;
        while(q--)
        {
            ll s, t, x, y ;
            cin >> s >> t >> x >> y ;
            ll ds = get_dist(s, t) ;
            ds /= c[1] ;
            y /= c[1] ;
            ds -= y ;
            cout << max(-1ll, x - ds) << '\n' ;
        }
        return 0 ;
    }
    return 0 ;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 28
• Subtask 3: 0 / 30
• Subtask 4: 0 / 32