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Submission #1000567

# Submission time Handle Problem Language Result Execution time Memory
1000567 2024-06-17T19:33:20 Z underwaterkillerwhale Swapping Cities (APIO20_swap) C++17
17 / 100
 143 ms 189896 KB 
#include "swap.h"
 
#include <bits/stdc++.h>
#define se              second
#define fs              first
#define mp              make_pair
#define pb              push_back
#define ll              long long
#define ii              pair<ll,ll>
#define ld              long double
#define SZ(v)           (int)v.size()
#define ALL(v)          v.begin(), v.end()
#define bit(msk, i)     ((msk >> i) & 1)
#define iter(id, v)     for(auto id : v)
#define rep(i,m,n)      for(int i=(m); i<=(n); i++)
#define reb(i,m,n)      for(int i=(m); i>=(n); i--)
 
using namespace std;
 
mt19937_64 rd(chrono :: steady_clock :: now().time_since_epoch().count());
ll Rand(ll l, ll r) { return uniform_int_distribution<ll> (l, r)(rd); }
 
const int N  = 1e5 + 7;
const int Mod = 1e9 +7;
const int szBL = 50;
const int INF = 1e9;
const int BASE = 137;
 
struct Edge {
    int u, v, w;
};
 
vector<int> weights;
struct Data {
    int labu, labv, szu, szv;
    bool islineu, islinev;
    pair<int,int> lnu, lnv;
};
 
struct Disjoin_set {
    int lab[N], sz[N];
    bool isline[N];
    pair<int,int> ln[N];
 
    stack<Data> op;
 
    void init (int n) {
        rep (i, 1, n) {
            lab[i] = i;
            sz[i] = 1;
            isline[i] = 1;
            ln[i] = {i, i};
        }
    }
 
    int Find (int u) {
        return u == lab[u] ? u : Find(lab[u]);
    }
 
    void Join (int u, int v){
        int uu = u, vv = v;
        u = Find(u);
        v = Find(v);
        op.push({u,v, sz[u], sz[v], isline[u], isline[v], ln[u], ln[v]});
        if (u == v) {
            isline[u] = 0;
            return;
        }
        if (sz[u] < sz[v]) swap (u, v), swap (uu, vv);
        if (min(isline[v], isline[u]) == 0) {
            isline[u] = isline[v] = 0;
        }
        else {
            if ((uu != ln[u].fs && uu != ln[u].se) || (vv != ln[v].fs && vv != ln[v].se)) {
                isline[u] = isline[v] = 0;
            }
            else {
                static vector<int> vec;
                if (ln[u].fs == ln[u].se) {
                    if (ln[v].fs != vv) ln[u].se = ln[v].fs;
                    else ln[u].se = ln[v].se;
                }
                else if (ln[v].fs == ln[v].se) {
                    if (ln[u].fs != uu) ln[u].se = ln[v].fs;
                    else ln[u].fs = ln[v].fs;
                }
                else {
                    vec = {ln[u].fs, ln[u].se, ln[v].fs, ln[v].se};
                    ln[u] = {-1, -1};
                    iter (&id, vec) {
                        if (id != uu && id != vv) {
                            if (ln[u].fs == -1) ln[u].fs = id;
                            else ln[u].se = id;
                        }
                    }
                }
            }
        }
        lab[v] = u;
        sz[u] += sz[v];
    }
 
    void roll_back() {
        Data &cur = op.top();
        op.pop();
        int u = cur.labu, v = cur.labv;
        lab[u] = cur.labu;
        sz[u] = cur.szu;
        isline[u] = cur.islineu;
        ln[u] = cur.lnu;
 
        lab[v] = cur.labv;
        sz[v] = cur.szv;
        isline[v] = cur.islinev;
        ln[v] = cur.lnv;
 
    }
 
    bool check (int u, int v) {
        u = Find(u);
        v = Find(v);
        if (u != v) return 0;
        return isline[u] == 0;
    }
 
}DSU[szBL + 2];
 
int n, m, Q;
vector<Edge> edges;
 
///0-idxed
int getBL (int X) { return X / szBL; }
int getLf (int X) { return X * szBL; }
int getRt (int X) { return min(m, (X + 1) * szBL - 1); }
 
void algo() {
    sort (ALL(edges), [] (Edge A, Edge B) { return A.w < B.w; });
    rep (bl, 0, getBL(m)) {
        if (bl == 0) DSU[bl].init(n);
        else {
            DSU[bl] = DSU[bl - 1];
            stack<Data> ().swap(DSU[bl].op);
        }
        rep (i, getLf(bl), getRt(bl)) {
            DSU[bl].Join(edges[i].u, edges[i].v);
        }
    }
}
 
int getMinimumFuelCapacity (int X, int Y) {
    ++X, ++Y;
    reb (bl, getBL(m), 0){
        if (DSU[bl].check(X, Y) == 0) {
            if (bl == getBL(m)) return -1;
            Disjoin_set &cur = DSU[bl];
            rep (i, getLf(bl + 1), getRt(bl + 1)) {
                cur.Join(edges[i].u, edges[i].v);
                if (cur.check(X, Y)) {
                    reb (j, i, getLf(bl + 1)) cur.roll_back();
                    return edges[i].w;
                }
            }
        }
        else if (bl == 0 && DSU[bl].check(X, Y) == 1) {
            Disjoin_set &cur = DSU[bl];
            int numdel = 0;
            while (cur.check(X, Y)) ++numdel, cur.roll_back();
            rep (i, getRt(bl) - numdel + 1, getRt(bl)) {
                cur.Join(edges[i].u, edges[i].v);
            }
            return edges[getRt(bl) - numdel + 1].w;
        }
    }
    return -1;
}
 
void init (int _n, int _m, vector<int> _U, vector<int> _V, vector<int> _W) {
//void solution() {
    n = _n;
    m = _m;
    rep (i, 0, m  - 1) {
        int u = _U[i], v = _V[i], w = _W[i];
        ++u, ++v;
        edges.push_back({u, v, w});
    }
//    cin >> n >> m;
//    rep (i, 1, m) {
//        int u, v, w;
//        cin >> u >> v >> w;
//        ++u,++v;
//        edges.push_back({u, v, w});
//    }
    algo();
//    cin >> Q;
//    rep (i, 1, Q) {
//        int X, Y;
//        cin >> X >> Y;
//        cout << getMinimumFuelCapacity(X, Y) <<"\n";
//    }
}
 
//#define file(name) freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);
//int main () {
//    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
////    file ("c");
//    int num_Test = 1;
////    cin >> num_Test;
//    while (num_Test--)
//        solution();
//}
/*
5 6
0 1 4
0 2 4
1 2 1
1 3 2
1 4 10
2 3 3
3
1 2
2 4
0 1
 
 
 
 
3 2
0 1 5
0 2 5
1
1 2
 
*/

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 86616 KB Output is correct
2 Correct 9 ms 86616 KB Output is correct
3 Correct 8 ms 86620 KB Output is correct
4 Correct 10 ms 86844 KB Output is correct
5 Correct 11 ms 86908 KB Output is correct
6 Correct 10 ms 86876 KB Output is correct
7 Correct 11 ms 86840 KB Output is correct
8 Correct 11 ms 86876 KB Output is correct
9 Runtime error 106 ms 183496 KB Execution killed with signal 11
10 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 86616 KB Output is correct
2 Correct 9 ms 86616 KB Output is correct
3 Runtime error 143 ms 189896 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 86616 KB Output is correct
2 Correct 9 ms 86616 KB Output is correct
3 Correct 8 ms 86620 KB Output is correct
4 Correct 10 ms 86844 KB Output is correct
5 Correct 11 ms 86908 KB Output is correct
6 Correct 10 ms 86876 KB Output is correct
7 Correct 11 ms 86840 KB Output is correct
8 Correct 11 ms 86876 KB Output is correct
9 Correct 9 ms 86616 KB Output is correct
10 Correct 11 ms 86876 KB Output is correct
11 Correct 11 ms 86784 KB Output is correct
12 Correct 11 ms 86876 KB Output is correct
13 Correct 14 ms 86872 KB Output is correct
14 Correct 11 ms 86876 KB Output is correct
15 Correct 11 ms 86876 KB Output is correct
16 Correct 11 ms 86872 KB Output is correct
17 Correct 11 ms 86876 KB Output is correct
18 Correct 14 ms 86776 KB Output is correct
19 Correct 11 ms 86876 KB Output is correct
20 Correct 12 ms 86876 KB Output is correct
21 Correct 11 ms 86876 KB Output is correct
22 Correct 13 ms 86876 KB Output is correct
23 Correct 10 ms 86876 KB Output is correct
24 Correct 14 ms 86876 KB Output is correct
25 Correct 14 ms 86872 KB Output is correct
26 Correct 14 ms 86876 KB Output is correct
27 Correct 11 ms 86872 KB Output is correct
28 Correct 15 ms 86832 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 86616 KB Output is correct
2 Correct 9 ms 86616 KB Output is correct
3 Correct 9 ms 86616 KB Output is correct
4 Correct 8 ms 86620 KB Output is correct
5 Correct 10 ms 86844 KB Output is correct
6 Correct 11 ms 86908 KB Output is correct
7 Correct 10 ms 86876 KB Output is correct
8 Correct 11 ms 86840 KB Output is correct
9 Correct 11 ms 86876 KB Output is correct
10 Runtime error 106 ms 183496 KB Execution killed with signal 11
11 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 86616 KB Output is correct
2 Correct 9 ms 86616 KB Output is correct
3 Correct 8 ms 86620 KB Output is correct
4 Correct 10 ms 86844 KB Output is correct
5 Correct 11 ms 86908 KB Output is correct
6 Correct 10 ms 86876 KB Output is correct
7 Correct 11 ms 86840 KB Output is correct
8 Correct 11 ms 86876 KB Output is correct
9 Runtime error 106 ms 183496 KB Execution killed with signal 11
10 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 86616 KB Output is correct
2 Correct 9 ms 86616 KB Output is correct
3 Correct 9 ms 86616 KB Output is correct
4 Correct 8 ms 86620 KB Output is correct
5 Correct 10 ms 86844 KB Output is correct
6 Correct 11 ms 86908 KB Output is correct
7 Correct 10 ms 86876 KB Output is correct
8 Correct 11 ms 86840 KB Output is correct
9 Correct 11 ms 86876 KB Output is correct
10 Runtime error 106 ms 183496 KB Execution killed with signal 11
11 Halted 0 ms 0 KB -