Submission #1111278

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111278		ljtunas	Factories (JOI14_factories)	C++17	0 / 100	115 ms	118344 KiB

factories

// author : anhtun_hi , nqg
#include <bits/stdc++.h>
#define ll long long
#define ii pair<ll, ll>
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define reset(h, v)    memset(h, v, sizeof h)
#define Forv(i, a)     for(auto& i : a)
#define For(i, a, b)   for(int i = a; i <= b; ++i)
#define Ford(i, a, b)  for(int i = a; i >= b; --i)
#define c_bit(i)     __builtin_popcountll(i)
#define Bit(mask, i)    ((mask >> i) & 1LL)
#define onbit(mask, i)  ((mask) bitor (1LL << i))
#define offbit(mask, i) ((mask) &~ (1LL << i))
using namespace std;
namespace std {
    template <typename T, int D>
    struct _vector : public vector <_vector <T, D - 1>> {
        static_assert(D >= 1, "Dimension must be positive!");
        template <typename... Args>
        _vector(int n = 0, Args... args) : vector <_vector <T, D - 1>> (n, _vector <T, D - 1> (args...)) {}
    };
    template <typename T> struct _vector <T, 1> : public vector <T> {
        _vector(int n = 0, const T& val = T()) : vector <T> (n, val) {}
    };
    template <class A, class B> bool minimize(A &a, B b){return a > b ? a = b, true : false;}
    template <class A, class B> bool maximize(A &a, B b){return a < b ? a = b, true : false;}
}
const int dx[] = {0, 0, +1, -1}, dy[] = {-1, +1, 0, 0}, LOG = 20, base = 311, inf = 1e9 + 5;
const int MAXN = 1e6 + 5;
const  ll  mod = 1e9 + 7;
const  ll   oo = 1e18;

//#define int long long

int sz[MAXN], p[MAXN]; bool del[MAXN];
vector<ii> g[MAXN];

void dfsSize(int u, int par){
    sz[u] = 1;
    for(auto [v, w] : g[u]) if((v ^ par) && !del[v]){
        dfsSize(v, u);
        sz[u] += sz[v];
    }
}

int find(int u, int par, int n){
    for(auto [v, w] : g[u])if(v ^ par){
        if(sz[v] > n / 2 && !del[v]) return find(v, u, n);
    }
    return u;
}

map<int, ll> d[MAXN];

void prepare(int u, int par, ll len, int root){
    d[root][u] = len;
    for(auto [v, w] : g[u]) if(v ^ par && !del[v]) prepare(v, u, len + w, root);
}

void buildCentroid(int u, int par){
    dfsSize(u, par);
    int c = find(u, par, sz[u]);
    del[c] = true;
    p[c] = par;
    prepare(c, par, 0, c);
    for(auto [v, _] : g[c]) if((v ^ par) && !del[v]) {
        buildCentroid(v, c);
    }
}

multiset<ii> res[MAXN]; bool op[MAXN];

void update(int u){
    int v = u;
    while(v){
        op[v] ^= 1;
        if(op[v]) res[v].insert({d[v][u], u});
        else res[v].erase({d[v][u], u});
        v = p[v];
    }
}

ll get(int u){
    int v = u;
    ll ans = 0;
//    cerr << res[u].size() << '\n';
    while(v){
        if(!res[v].empty()){
            auto it = res[v].begin();
            ++it;
            minimize(ans, it -> fi + d[v][u]);
        }
        v = p[v];
    }
    return ans;
}

void Init(int n, int a[], int b[], int d[]){
    cin >> n;
    For(i, 0, n - 2) {
        cin >> a[i] >> b[i] >> d[i];
    }
    For(i, 0, n - 2){
        ++a[i], ++b[i];
        g[a[i]].push_back({b[i], d[i]});
        g[b[i]].push_back({a[i], d[i]});
    }
    buildCentroid(1, 0);
}

long long Query(int S, int X[], int T, int Y[]){


    cin >> S;
    For(i, 0, S - 1) cin >> X[i];
    cin >> T;
    For(i, 0, T - 1) cin >> Y[i];

    For(i, 0, S - 1){
        int u = X[i] + 1;
        update(u);
    }
    ll ans = oo;
    For(i, 0, T - 1){
        minimize(ans, get(Y[i] + 1));
    }
     For(i, 0, S - 1){
        int u = X[i] + 1;
        update(u);
    }
    return ans;
}

//void Solve() {
////    Init(n, a[], b[], d[]);
//}
//
//int32_t main() {
//    cin.tie(0) -> sync_with_stdio(0);
//    if(fopen("JOI14_factories.inp", "r")) {
//        freopen("JOI14_factories.inp", "r", stdin);
//        freopen("JOI14_factories.out", "w", stdout);
//    }
//
//    int t = 1;
////    cin >> t;
//
//    for (int test = 1; test <= t; test++) {
//        Solve();
//    }
//    return 0;
//}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67