oj.uz

Submission #1016145

# Submission time Handle Problem Language Result Execution time Memory
1016145 2024-07-07T12:43:00 Z hotboy2703 Simurgh (IOI17_simurgh) C++17
100 / 100
 104 ms 6740 KB 
#include "simurgh.h"

#include<bits/stdc++.h>
using namespace std;
using ll = int;
#define pll pair <ll,ll>
#define fi first
#define se second
#define MP make_pair
#define sz(a) (ll((a).size()))
#define BIT(mask,i) (((mask) >> (i))&1)
#define MASK(i) (1LL << (i))
namespace TRUNG{
    const ll MAXN = 510;
    ll n,m;
    ll ans[MAXN*MAXN];
    vector <pll> g[MAXN];
    bool sus[MAXN*MAXN];
    ll in[MAXN],out[MAXN];
    ll timeDFS;
    vector <pll> a;
    ll cnt_query;
    void dfs(ll u,ll p){
        in[u] = ++timeDFS;
        for (auto tmp:g[u]){
            ll v = tmp.fi,id = tmp.se;
            if (v==p)continue;
            dfs(v,u);
        }
        out[u] = timeDFS;
    }
    bool sus_edge(ll i,ll j){
        ll x = a[i].fi;
        if (in[a[i].se] > in[x])x = a[i].se;
//        cout<<i<<' '<<j<<' '<<x<<endl;
        if ((in[x] <= in[a[j].fi] && in[a[j].fi] <= out[x])+(in[x] <= in[a[j].se] && in[a[j].se] <= out[x])==1)return 1;
        return 0;
    }

    namespace DSU{
        ll dsu[MAXN];
        void init(){
            memset(dsu,-1,sizeof dsu);
        }
        ll f(ll x){
            if (dsu[x] < 0)return x;
            return (dsu[x] = f(dsu[x]));
        }
        void join(ll x,ll y){
            x = f(x),y = f(y);
            if (x!=y){
                if (dsu[x] > dsu[y])swap(x,y);
                dsu[x] += dsu[y];
                dsu[y] = x;
            }
        }
    }
    bitset <MAXN> bs[MAXN];
    ll ind[MAXN][MAXN];
    vector <ll> tree,extra;
    ll superior_count(vector <ll> all){
        DSU::init();
        for (auto x:all){
            DSU::join(a[x].fi,a[x].se);
        }
        ll res = 0;
        for (auto x:tree){
            if (DSU::f(a[x].fi) != DSU::f(a[x].se)){
                DSU::join(a[x].fi,a[x].se);
                all.push_back(x);
                res-=ans[x];
            }
        }
        assert(++cnt_query<=8000);
        res += count_common_roads(all);
        return res;
    }
    void solve(vector <ll> all,ll k){
        if (k==0)return;
        if (sz(all) == 1){
            ans[all[0]] = k;
            return;
        }
        ll mid = sz(all) / 2;
        vector <ll> L,R;
        for (ll i = 0;i < sz(all);i ++){
            if (i < mid)L.push_back(all[i]);
            else R.push_back(all[i]);
        }
        ll cnt_L = superior_count(L);
        solve(L,cnt_L);
        solve(R,k-cnt_L);
    }
}
std::vector<int> find_roads(int N, std::vector<int> U, std::vector<int> V) {
    using namespace TRUNG;
    memset(ans,-1,sizeof ans);
    ll m = sz(U),n=N ;
    a.resize(m);
    for (ll i = 0;i < m;i ++)a[i] = MP(U[i],V[i]);
    DSU::init();
    for (ll i = 0;i < m;i ++){
        if (DSU::f(a[i].fi) != DSU::f(a[i].se)){sus[i] = 1;tree.push_back(i);}
        DSU::join(a[i].fi,a[i].se);
    }
    DSU::init();
    for (ll i = 0;i < m;i ++){
        if (sus[i])continue;
        if (DSU::f(a[i].fi) != DSU::f(a[i].se))extra.push_back(i);
        DSU::join(a[i].fi,a[i].se);
    }
    for (auto id:tree){
        g[a[id].fi].push_back(MP(a[id].se,id));
        g[a[id].se].push_back(MP(a[id].fi,id));
    }
    dfs(0,0);
//    cout<<in[4]<<' '<<out[4]<<' '<<in[1]<<' '<<out[1]<<endl;
//    for (auto x:tree)cout<<x<<' ';
//    cout<<'\n';
//    for (auto x:extra)cout<<x<<' ';
//    cout<<'\n';
//    cout<<sus_edge(4,7)<<endl;

    ll cur = count_common_roads(tree);
        assert(++cnt_query<=8000);

    for (auto id:tree){
//        cout<<id<<endl;
        if (ans[id] != -1)continue;
        for (auto x:extra){
            if (sus_edge(id,x)){
//                cout<<"WOW "<<x<<' '<<id<<endl;
                auto cal = [&](ll y){
                    vector <ll> tmp;
                    for (auto sss:tree)if (sss != y)tmp.push_back(sss);
                    tmp.push_back(x);
                            assert(++cnt_query<=8000);
//                    cout<<"CAL "<<y<<": ";
//                    for (auto z:tmp)cout<<z<<' ';
//                    cout<<endl;
                    ll res = count_common_roads(tmp);
//                    cout<<"VAL "<<res<<endl;
                    return res;
                };
                vector <ll> cycle;
                for (auto y:tree){
                    if (sus_edge(y,x)){
                        cycle.push_back(y);
                    }
                }
//                for (auto y:cycle)cout<<y<<' ';
//                cout<<endl;
                ll sum = -1;
                if (ans[x] != -1)sum = ans[x] + cur;
                for (auto y:cycle){
                    if (ans[y] != -1 && sum == -1){
                        sum = cal(y) + ans[y];
                        break;
                    }
                }
                if (sum==-1){
                    vector <ll> com(sz(cycle));
                    for (ll j = 0;j < sz(cycle);j ++){
                        com[j] = cal(cycle[j]);
                        if (com[j] < cur)sum = cur;
                        if (com[j] > cur)sum = cur+1;
//                        cout<<cycle[j]<<' '<<com[j]<<endl;
                    }
                    if (sum == -1)sum = cur;
                    for (ll j = 0;j < sz(cycle);j ++){
                        ans[cycle[j]] = sum - com[j];
                    }
                    ans[x] = sum - cur;
                }
                else{
                    for (auto y:cycle)if (ans[y] == -1){
                        ans[y] = sum - cal(y);
                    }
                    ans[x] = sum - cur;
                }
                break;
            }
        }
        if (ans[id] == -1)ans[id] = 1;
    }
//    for (ll j = 0;j < m;j ++)cout<<ans[j]<<' ';
//    cout<<endl;
    for (ll j = 0;j < m;j ++){
        pll x = a[j];
        ind[x.fi][x.se]=ind[x.se][x.fi]=j;
        if (ans[j] == -1)bs[x.fi][x.se] = bs[x.se][x.fi] = 1;
    }
    while (true){
        bitset <MAXN> rem;
        rem.set();
        bitset <MAXN> tmp;
        vector <ll> cur;
        for (ll i = 0;i < n;i ++){
            if (rem[i]){
                queue <ll> q;
                q.push(i);
                rem[i] = 0;
                while (!q.empty()){
                    ll u = q.front();
                    q.pop();
                    tmp = rem & bs[u];
                    for (ll v = tmp._Find_first();v < n;v = tmp._Find_next(v)){
                        cur.push_back(ind[u][v]);
                        bs[u][v] = bs[v][u] = 0;
                        q.push(v);
                        rem[v] = 0;
                    }
                }
            }
        }
        if (!sz(cur))break;
//        cout<<sz(cur)<<' '<<cur[0]<<endl;
        solve(cur,superior_count(cur));
    }
    vector <ll> r;
    for (ll i = 0;i < m;i ++)if (ans[i]==1)r.push_back(i);
//    assert(cnt_query<=8000);
//    count_common_roads
    return r;
}

Compilation message

simurgh.cpp: In function 'void TRUNG::dfs(ll, ll)':
simurgh.cpp:26:27: warning: unused variable 'id' [-Wunused-variable]
   26 |             ll v = tmp.fi,id = tmp.se;
      |                           ^~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB correct
2 Correct 1 ms 2396 KB correct
3 Correct 1 ms 2396 KB correct
4 Correct 1 ms 2392 KB correct
5 Correct 1 ms 2396 KB correct
6 Correct 1 ms 2396 KB correct
7 Correct 1 ms 2396 KB correct
8 Correct 1 ms 2396 KB correct
9 Correct 1 ms 2396 KB correct
10 Correct 1 ms 2396 KB correct
11 Correct 1 ms 2396 KB correct
12 Correct 1 ms 2392 KB correct
13 Correct 1 ms 2396 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB correct
2 Correct 1 ms 2396 KB correct
3 Correct 1 ms 2396 KB correct
4 Correct 1 ms 2392 KB correct
5 Correct 1 ms 2396 KB correct
6 Correct 1 ms 2396 KB correct
7 Correct 1 ms 2396 KB correct
8 Correct 1 ms 2396 KB correct
9 Correct 1 ms 2396 KB correct
10 Correct 1 ms 2396 KB correct
11 Correct 1 ms 2396 KB correct
12 Correct 1 ms 2392 KB correct
13 Correct 1 ms 2396 KB correct
14 Correct 2 ms 2648 KB correct
15 Correct 1 ms 2756 KB correct
16 Correct 2 ms 2652 KB correct
17 Correct 2 ms 2652 KB correct
18 Correct 1 ms 2652 KB correct
19 Correct 1 ms 2652 KB correct
20 Correct 1 ms 2652 KB correct
21 Correct 1 ms 2756 KB correct
22 Correct 1 ms 2652 KB correct
23 Correct 1 ms 2652 KB correct
24 Correct 1 ms 2652 KB correct
25 Correct 1 ms 2652 KB correct
26 Correct 1 ms 2652 KB correct
27 Correct 1 ms 2652 KB correct
28 Correct 2 ms 2652 KB correct
29 Correct 1 ms 2652 KB correct
30 Correct 1 ms 2648 KB correct
31 Correct 1 ms 2652 KB correct
32 Correct 1 ms 2652 KB correct
33 Correct 1 ms 2652 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB correct
2 Correct 1 ms 2396 KB correct
3 Correct 1 ms 2396 KB correct
4 Correct 1 ms 2392 KB correct
5 Correct 1 ms 2396 KB correct
6 Correct 1 ms 2396 KB correct
7 Correct 1 ms 2396 KB correct
8 Correct 1 ms 2396 KB correct
9 Correct 1 ms 2396 KB correct
10 Correct 1 ms 2396 KB correct
11 Correct 1 ms 2396 KB correct
12 Correct 1 ms 2392 KB correct
13 Correct 1 ms 2396 KB correct
14 Correct 2 ms 2648 KB correct
15 Correct 1 ms 2756 KB correct
16 Correct 2 ms 2652 KB correct
17 Correct 2 ms 2652 KB correct
18 Correct 1 ms 2652 KB correct
19 Correct 1 ms 2652 KB correct
20 Correct 1 ms 2652 KB correct
21 Correct 1 ms 2756 KB correct
22 Correct 1 ms 2652 KB correct
23 Correct 1 ms 2652 KB correct
24 Correct 1 ms 2652 KB correct
25 Correct 1 ms 2652 KB correct
26 Correct 1 ms 2652 KB correct
27 Correct 1 ms 2652 KB correct
28 Correct 2 ms 2652 KB correct
29 Correct 1 ms 2652 KB correct
30 Correct 1 ms 2648 KB correct
31 Correct 1 ms 2652 KB correct
32 Correct 1 ms 2652 KB correct
33 Correct 1 ms 2652 KB correct
34 Correct 20 ms 3672 KB correct
35 Correct 23 ms 3500 KB correct
36 Correct 17 ms 3416 KB correct
37 Correct 5 ms 2772 KB correct
38 Correct 24 ms 3676 KB correct
39 Correct 18 ms 3572 KB correct
40 Correct 15 ms 3416 KB correct
41 Correct 21 ms 3676 KB correct
42 Correct 21 ms 3672 KB correct
43 Correct 6 ms 3164 KB correct
44 Correct 5 ms 3164 KB correct
45 Correct 6 ms 3064 KB correct
46 Correct 5 ms 2908 KB correct
47 Correct 3 ms 2908 KB correct
48 Correct 2 ms 2652 KB correct
49 Correct 3 ms 2668 KB correct
50 Correct 3 ms 2908 KB correct
51 Correct 6 ms 3160 KB correct
52 Correct 5 ms 3164 KB correct
53 Correct 5 ms 2908 KB correct
54 Correct 6 ms 3164 KB correct
55 Correct 9 ms 3164 KB correct
56 Correct 6 ms 3160 KB correct
57 Correct 5 ms 3160 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB correct
2 Correct 1 ms 2652 KB correct
3 Correct 64 ms 5248 KB correct
4 Correct 96 ms 6720 KB correct
5 Correct 102 ms 6740 KB correct
6 Correct 96 ms 6740 KB correct
7 Correct 69 ms 6668 KB correct
8 Correct 71 ms 6736 KB correct
9 Correct 104 ms 6640 KB correct
10 Correct 102 ms 6720 KB correct
11 Correct 94 ms 6712 KB correct
12 Correct 99 ms 6660 KB correct
13 Correct 1 ms 2396 KB correct
14 Correct 78 ms 6740 KB correct
15 Correct 87 ms 6736 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB correct
2 Correct 1 ms 2396 KB correct
3 Correct 1 ms 2396 KB correct
4 Correct 1 ms 2392 KB correct
5 Correct 1 ms 2396 KB correct
6 Correct 1 ms 2396 KB correct
7 Correct 1 ms 2396 KB correct
8 Correct 1 ms 2396 KB correct
9 Correct 1 ms 2396 KB correct
10 Correct 1 ms 2396 KB correct
11 Correct 1 ms 2396 KB correct
12 Correct 1 ms 2392 KB correct
13 Correct 1 ms 2396 KB correct
14 Correct 2 ms 2648 KB correct
15 Correct 1 ms 2756 KB correct
16 Correct 2 ms 2652 KB correct
17 Correct 2 ms 2652 KB correct
18 Correct 1 ms 2652 KB correct
19 Correct 1 ms 2652 KB correct
20 Correct 1 ms 2652 KB correct
21 Correct 1 ms 2756 KB correct
22 Correct 1 ms 2652 KB correct
23 Correct 1 ms 2652 KB correct
24 Correct 1 ms 2652 KB correct
25 Correct 1 ms 2652 KB correct
26 Correct 1 ms 2652 KB correct
27 Correct 1 ms 2652 KB correct
28 Correct 2 ms 2652 KB correct
29 Correct 1 ms 2652 KB correct
30 Correct 1 ms 2648 KB correct
31 Correct 1 ms 2652 KB correct
32 Correct 1 ms 2652 KB correct
33 Correct 1 ms 2652 KB correct
34 Correct 20 ms 3672 KB correct
35 Correct 23 ms 3500 KB correct
36 Correct 17 ms 3416 KB correct
37 Correct 5 ms 2772 KB correct
38 Correct 24 ms 3676 KB correct
39 Correct 18 ms 3572 KB correct
40 Correct 15 ms 3416 KB correct
41 Correct 21 ms 3676 KB correct
42 Correct 21 ms 3672 KB correct
43 Correct 6 ms 3164 KB correct
44 Correct 5 ms 3164 KB correct
45 Correct 6 ms 3064 KB correct
46 Correct 5 ms 2908 KB correct
47 Correct 3 ms 2908 KB correct
48 Correct 2 ms 2652 KB correct
49 Correct 3 ms 2668 KB correct
50 Correct 3 ms 2908 KB correct
51 Correct 6 ms 3160 KB correct
52 Correct 5 ms 3164 KB correct
53 Correct 5 ms 2908 KB correct
54 Correct 6 ms 3164 KB correct
55 Correct 9 ms 3164 KB correct
56 Correct 6 ms 3160 KB correct
57 Correct 5 ms 3160 KB correct
58 Correct 1 ms 2396 KB correct
59 Correct 1 ms 2652 KB correct
60 Correct 64 ms 5248 KB correct
61 Correct 96 ms 6720 KB correct
62 Correct 102 ms 6740 KB correct
63 Correct 96 ms 6740 KB correct
64 Correct 69 ms 6668 KB correct
65 Correct 71 ms 6736 KB correct
66 Correct 104 ms 6640 KB correct
67 Correct 102 ms 6720 KB correct
68 Correct 94 ms 6712 KB correct
69 Correct 99 ms 6660 KB correct
70 Correct 1 ms 2396 KB correct
71 Correct 78 ms 6740 KB correct
72 Correct 87 ms 6736 KB correct
73 Correct 1 ms 2392 KB correct
74 Correct 92 ms 6740 KB correct
75 Correct 83 ms 6484 KB correct
76 Correct 42 ms 4192 KB correct
77 Correct 94 ms 6736 KB correct
78 Correct 91 ms 6664 KB correct
79 Correct 89 ms 6736 KB correct
80 Correct 92 ms 6492 KB correct
81 Correct 64 ms 5972 KB correct
82 Correct 104 ms 6576 KB correct
83 Correct 69 ms 4752 KB correct
84 Correct 25 ms 4896 KB correct
85 Correct 23 ms 4696 KB correct
86 Correct 18 ms 4216 KB correct
87 Correct 14 ms 3676 KB correct
88 Correct 11 ms 3432 KB correct
89 Correct 13 ms 3420 KB correct
90 Correct 11 ms 3420 KB correct
91 Correct 5 ms 2716 KB correct
92 Correct 4 ms 2652 KB correct
93 Correct 23 ms 4824 KB correct
94 Correct 17 ms 4224 KB correct
95 Correct 17 ms 3932 KB correct
96 Correct 11 ms 3416 KB correct
97 Correct 15 ms 3432 KB correct
98 Correct 14 ms 3788 KB correct
99 Correct 12 ms 3632 KB correct
100 Correct 7 ms 2908 KB correct
101 Correct 5 ms 2652 KB correct
102 Correct 20 ms 4700 KB correct
103 Correct 20 ms 4700 KB correct
104 Correct 21 ms 4696 KB correct
105 Correct 20 ms 4700 KB correct