oj.uz

답안 #1077996

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1077996 2024-08-27T11:29:18 Z Sorting 공장들 (JOI14_factories) C++17
100 / 100
 3641 ms 168476 KB 
#pragma GCC optmize("O3")
#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <array>
#include <iomanip>
#include <queue>
#include <stack>
#include <numeric>
#include <cassert>
#include <cmath>
#include <random>
#include <ctime>
#include <chrono>
#include <unordered_map>

using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)x.size())
#define rep(i, a, b) for(int i = a; i < b; ++i)

template <typename T>
void remove_duplicates(vector<T> &v){
    sort(all(v));
    v.resize(unique(all(v)) - v.begin());
}

template <typename T> void chmin(T &a, T b){ a = (b < a) ? b : a; }
template <typename T> void chmax(T &a, T b){ a = (b > a) ? b : a; }

template<class T>
struct RMQ {
	vector<vector<T>> jmp;
    RMQ(){}
	RMQ(const vector<T>& V) : jmp(1, V) {
		for (int pw = 1, k = 1; pw * 2 <= sz(V); pw *= 2, ++k) {
			jmp.emplace_back(sz(V) - pw * 2 + 1);
			rep(j,0,sz(jmp[k]))
				jmp[k][j] = min(jmp[k - 1][j], jmp[k - 1][j + pw]);
		}
	}
	T query(int a, int b) {
		// assert(a < b); // or return inf if a == b
		int dep = 31 - __builtin_clz(b - a);
		return min(jmp[dep][a], jmp[dep][b - (1 << dep)]);
	}
};

struct LCA {
	int T = 0;
	vi time, path, ret;
	RMQ<int> rmq;

    LCA(){}
	LCA(vector<vi>& C) : time(sz(C)), rmq((dfs(C,0,-1), ret)) {}
	void dfs(vector<vi>& C, int v, int par) {
		time[v] = T++;
		for (int y : C[v]) if (y != par) {
			path.push_back(v), ret.push_back(time[v]);
			dfs(C, y, v);
		}
	}

	int lca(int a, int b) {
		if (a == b) return a;
		tie(a, b) = minmax(time[a], time[b]);
		return path[rmq.query(a, b)];
	}
	//dist(a,b){return depth[a] + depth[b] - 2*depth[lca(a,b)];}
} lca;

const int N = 5e5 + 3;

int n, sz[N];
vector<pii> adj[N];
bool vis[N];

int cen_par[N];

ll depth[N];

ll get_dist(int a, int b){
    int l = lca.lca(a, b);
    return depth[a] + depth[b] - 2 * depth[l];
}

void dfs_depth(int u, int par = -1){
    for(auto [to, w]: adj[u]){
        if(to == par) continue;
        depth[to] = depth[u] + w;
        dfs_depth(to, u);
    }
}

void dfs_sz(int u, int par = -1){
    sz[u] = 1;
    for(auto [to, w]: adj[u]){
        if(vis[to] || to == par) continue;
        dfs_sz(to, u);
        sz[u] += sz[to];
    }
}

int find_centroid(int u, int sz_root, int par = -1){
    for(auto [to, w]: adj[u]){
        if(to == par || vis[to]) continue;
        if(sz[to] >= sz_root / 2) return find_centroid(to, sz_root, u);
    }
    return u;
}

void decompose(int u, int par = -1){
    dfs_sz(u);
    int cen = find_centroid(u, sz[u]);

    cen_par[cen] = par;
    vis[cen] = true;

    for(auto [to, w]: adj[cen]){
        if(vis[to]) continue;
        decompose(to, cen);
    }
}

const ll INF = 1e18;
ll mn[N];

void Init(int _n, int *a, int *b, int *d){
    n = _n;

    vector<vi> adj2(n + 1);
    for(int i = 0; i < n - 1; ++i){
        adj[a[i]].push_back({b[i], d[i]});
        adj[b[i]].push_back({a[i], d[i]});
        adj2[a[i]].push_back(b[i]);
        adj2[b[i]].push_back(a[i]);
    }

    lca = LCA(adj2);

    decompose(0);

    // for(int i = 0; i < n; ++i){
        // cout << "anc of " << i << ": ";
        // for(int x: anc[i])
            // cout << x << " ";
        // cout << endl;
    // }

    dfs_depth(0);

    for(int i = 0; i < n; ++i)
        mn[i] = INF;
}

ll Query(int s, int x[], int t, int y[]){
    for(int i = 0; i < s; ++i){
        int v = x[i];
        int a = v;

        while(a != -1){
            chmin(mn[a], get_dist(a, v));
            a = cen_par[a];
        }
    }
    // cout << "x" << endl;

    ll ans = INF;
    for(int i = 0; i < t; ++i){
        int v = y[i];
        int a = v;

        while(a != -1){
            chmin(ans, mn[a] + get_dist(a, v));
            a = cen_par[a];
        }
    }

    for(int i = 0; i < s; ++i){
        int v = x[i];
        int a = v;

        while(a != -1){
            mn[a] = INF;
            a = cen_par[a];
        }
    }

    return ans;
}

Compilation message

factories.cpp:1: warning: ignoring '#pragma GCC optmize' [-Wunknown-pragmas]
    1 | #pragma GCC optmize("O3")
      |

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 12380 KB Output is correct
2 Correct 268 ms 20944 KB Output is correct
3 Correct 332 ms 21124 KB Output is correct
4 Correct 342 ms 21076 KB Output is correct
5 Correct 405 ms 21332 KB Output is correct
6 Correct 144 ms 21072 KB Output is correct
7 Correct 377 ms 21072 KB Output is correct
8 Correct 335 ms 21076 KB Output is correct
9 Correct 410 ms 21332 KB Output is correct
10 Correct 150 ms 21108 KB Output is correct
11 Correct 339 ms 21328 KB Output is correct

Subtask #2
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 12376 KB Output is correct
2 Correct 1392 ms 123076 KB Output is correct
3 Correct 1814 ms 125628 KB Output is correct
4 Correct 543 ms 125872 KB Output is correct
5 Correct 2617 ms 153008 KB Output is correct
6 Correct 1883 ms 125800 KB Output is correct
7 Correct 828 ms 41416 KB Output is correct
8 Correct 241 ms 41588 KB Output is correct
9 Correct 1040 ms 44740 KB Output is correct
10 Correct 825 ms 41672 KB Output is correct

Subtask #3
67.0 / 67.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 12380 KB Output is correct
2 Correct 268 ms 20944 KB Output is correct
3 Correct 332 ms 21124 KB Output is correct
4 Correct 342 ms 21076 KB Output is correct
5 Correct 405 ms 21332 KB Output is correct
6 Correct 144 ms 21072 KB Output is correct
7 Correct 377 ms 21072 KB Output is correct
8 Correct 335 ms 21076 KB Output is correct
9 Correct 410 ms 21332 KB Output is correct
10 Correct 150 ms 21108 KB Output is correct
11 Correct 339 ms 21328 KB Output is correct
12 Correct 10 ms 12376 KB Output is correct
13 Correct 1392 ms 123076 KB Output is correct
14 Correct 1814 ms 125628 KB Output is correct
15 Correct 543 ms 125872 KB Output is correct
16 Correct 2617 ms 153008 KB Output is correct
17 Correct 1883 ms 125800 KB Output is correct
18 Correct 828 ms 41416 KB Output is correct
19 Correct 241 ms 41588 KB Output is correct
20 Correct 1040 ms 44740 KB Output is correct
21 Correct 825 ms 41672 KB Output is correct
22 Correct 1756 ms 125772 KB Output is correct
23 Correct 1842 ms 126388 KB Output is correct
24 Correct 2607 ms 140392 KB Output is correct
25 Correct 2671 ms 142148 KB Output is correct
26 Correct 2626 ms 141012 KB Output is correct
27 Correct 3641 ms 168476 KB Output is correct
28 Correct 635 ms 148444 KB Output is correct
29 Correct 2587 ms 146864 KB Output is correct
30 Correct 2574 ms 146100 KB Output is correct
31 Correct 2515 ms 146784 KB Output is correct
32 Correct 1068 ms 56488 KB Output is correct
33 Correct 250 ms 52936 KB Output is correct
34 Correct 633 ms 51188 KB Output is correct
35 Correct 615 ms 51144 KB Output is correct
36 Correct 871 ms 51576 KB Output is correct
37 Correct 868 ms 51576 KB Output is correct