oj.uz

Submission #893928

# Submission time Handle Problem Language Result Execution time Memory
893928 2023-12-27T17:09:15 Z abcvuitunggio Simurgh (IOI17_simurgh) C++17
100 / 100
 855 ms 16920 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
using namespace std;
struct edge{
    int u,v;
}e[150000];
int n,m,ch[150000],low[501],tin[501],tout[501],t,par[501],cur,p[501];
vector <int> ve,res;
set <int> s,ke[501];
int ask(set <int> s){
    vector <int> r;
    for (int i:s)
        r.push_back(i);
    return count_common_roads(r);
}
void dfs(int u, int parent){
    tin[u]=low[u]=++t;
    for (int i:ke[u]){
        int v=e[i].u^e[i].v^u;
        if (v!=parent){
            if (!tin[v]){
                s.insert(i);
                par[v]=i;
                dfs(v,u);
                low[u]=min(low[u],low[v]);
                if (low[v]==tin[v])
                    ch[i]=1;
            }
            else
                low[u]=min(low[u],tin[v]);
        }
    }
    tout[u]=t;
}
bool isancestor(int u, int v){
    return (tin[u]<=tin[v]&&tout[u]>=tout[v]);
}
void get_path(int u, int v){
    ve.clear();
    while (!isancestor(u,v)){
        ve.push_back(par[u]);
        u^=e[par[u]].u^e[par[u]].v;
    }
    while (!isancestor(v,u)){
        ve.push_back(par[v]);
        v^=e[par[v]].u^e[par[v]].v;
    }
}
int f(int i){
    return (p[i]==i?i:p[i]=f(p[i]));
}
bool unite(int i, int j){
    i=f(i);
    j=f(j);
    if (i==j)
        return false;
    p[j]=i;
    return true;
}
int calc(set <int> s2){
    iota(p,p+n,0);
    for (int i:s2)
        unite(e[i].u,e[i].v);
    int cnt=0;
    for (int i:s)
        if (unite(e[i].u,e[i].v)){
            s2.insert(i);
            cnt+=ch[i];
        }
    return ask(s2)-cnt;
}
vector <int> find_roads(int N, vector <int> u, vector <int> v){
    n=N,m=u.size();
    for (int i=0;i<m;i++){
        e[i]={u[i],v[i]};
        ke[u[i]].insert(i);
        ke[v[i]].insert(i);
    }
    fill(ch,ch+m,-1);
    dfs(0,0);
    cur=ask(s);
    for (int i=0;i<m;i++)
        if (s.find(i)==s.end()){
            get_path(u[i],v[i]);
            int c=1;
            for (int j:ve)
                if (ch[j]==-1)
                    c=0;
            if (c)
                continue;
            for (int j:ve){
                if (ch[j]!=-1){
                    s.erase(j);
                    s.insert(i);
                    ch[i]=(ch[j]?1-cur+ask(s):ask(s)-cur);
                    s.erase(i);
                    s.insert(j);
                    break;
                }
            }
            if (ch[i]!=-1){
                for (int j:ve)
                    if (ch[j]==-1){
                        s.erase(j);
                        s.insert(i);
                        ch[j]=(ch[i]?1+cur-ask(s):cur-ask(s));
                        s.erase(i);
                        s.insert(j);
                    }
                continue;
            }
            int mx=-1;
            for (int j:ve){
                s.erase(j);
                s.insert(i);
                ch[j]=ask(s)-cur;
                mx=max(mx,ch[j]);
                s.erase(i);
                s.insert(j);
            }
            if (mx==1){
                ch[i]=1;
                for (int j:ve)
                    ch[j]^=1;
                continue;
            }
            ch[i]=0;
            for (int j:ve)
                ch[j]=-ch[j];
        }
    vector <int> tmp;
    set <int> S;
    for (int i=0;i<n;i++){
        int deg=calc(ke[i]);
        while (deg){
            tmp.clear();
            for (int j:ke[i])
                tmp.push_back(j);
            int l=0,r=tmp.size()-1,kq=-1;
            while (l<=r){
                int mid=(l+r)>>1;
                S.clear();
                for (int i=0;i<=mid;i++)
                    S.insert(tmp[i]);
                if (calc(S)==deg){
                    kq=tmp[mid];
                    r=mid-1;
                }
                else
                    l=mid+1;
            }
            res.push_back(kq);
            ke[u[kq]].erase(kq);
            ke[v[kq]].erase(kq);
            deg--;
        }
    }
    return res;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB correct
2 Correct 1 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 1 ms 344 KB correct
5 Correct 1 ms 344 KB correct
6 Correct 0 ms 344 KB correct
7 Correct 1 ms 344 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 348 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB correct
2 Correct 1 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 1 ms 344 KB correct
5 Correct 1 ms 344 KB correct
6 Correct 0 ms 344 KB correct
7 Correct 1 ms 344 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 348 KB correct
14 Correct 4 ms 604 KB correct
15 Correct 3 ms 604 KB correct
16 Correct 4 ms 472 KB correct
17 Correct 3 ms 604 KB correct
18 Correct 2 ms 348 KB correct
19 Correct 3 ms 604 KB correct
20 Correct 5 ms 604 KB correct
21 Correct 3 ms 344 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 4 ms 564 KB correct
24 Correct 4 ms 348 KB correct
25 Correct 2 ms 348 KB correct
26 Correct 2 ms 348 KB correct
27 Correct 3 ms 600 KB correct
28 Correct 2 ms 348 KB correct
29 Correct 2 ms 348 KB correct
30 Correct 2 ms 348 KB correct
31 Correct 3 ms 348 KB correct
32 Correct 2 ms 348 KB correct
33 Correct 3 ms 344 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB correct
2 Correct 1 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 1 ms 344 KB correct
5 Correct 1 ms 344 KB correct
6 Correct 0 ms 344 KB correct
7 Correct 1 ms 344 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 348 KB correct
14 Correct 4 ms 604 KB correct
15 Correct 3 ms 604 KB correct
16 Correct 4 ms 472 KB correct
17 Correct 3 ms 604 KB correct
18 Correct 2 ms 348 KB correct
19 Correct 3 ms 604 KB correct
20 Correct 5 ms 604 KB correct
21 Correct 3 ms 344 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 4 ms 564 KB correct
24 Correct 4 ms 348 KB correct
25 Correct 2 ms 348 KB correct
26 Correct 2 ms 348 KB correct
27 Correct 3 ms 600 KB correct
28 Correct 2 ms 348 KB correct
29 Correct 2 ms 348 KB correct
30 Correct 2 ms 348 KB correct
31 Correct 3 ms 348 KB correct
32 Correct 2 ms 348 KB correct
33 Correct 3 ms 344 KB correct
34 Correct 117 ms 4212 KB correct
35 Correct 105 ms 3932 KB correct
36 Correct 92 ms 2904 KB correct
37 Correct 40 ms 668 KB correct
38 Correct 110 ms 4068 KB correct
39 Correct 112 ms 3648 KB correct
40 Correct 99 ms 2964 KB correct
41 Correct 99 ms 4188 KB correct
42 Correct 107 ms 4192 KB correct
43 Correct 77 ms 2476 KB correct
44 Correct 71 ms 2092 KB correct
45 Correct 71 ms 2140 KB correct
46 Correct 68 ms 1892 KB correct
47 Correct 51 ms 1112 KB correct
48 Correct 20 ms 348 KB correct
49 Correct 34 ms 600 KB correct
50 Correct 50 ms 1112 KB correct
51 Correct 87 ms 2140 KB correct
52 Correct 66 ms 1880 KB correct
53 Correct 64 ms 1896 KB correct
54 Correct 85 ms 2472 KB correct
55 Correct 71 ms 2396 KB correct
56 Correct 80 ms 2372 KB correct
57 Correct 74 ms 2136 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB correct
2 Correct 1 ms 348 KB correct
3 Correct 370 ms 10880 KB correct
4 Correct 634 ms 16900 KB correct
5 Correct 855 ms 16920 KB correct
6 Correct 621 ms 16708 KB correct
7 Correct 591 ms 16704 KB correct
8 Correct 605 ms 16912 KB correct
9 Correct 618 ms 16792 KB correct
10 Correct 636 ms 16708 KB correct
11 Correct 629 ms 16496 KB correct
12 Correct 640 ms 16716 KB correct
13 Correct 1 ms 348 KB correct
14 Correct 636 ms 16660 KB correct
15 Correct 629 ms 16704 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB correct
2 Correct 1 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 1 ms 344 KB correct
5 Correct 1 ms 344 KB correct
6 Correct 0 ms 344 KB correct
7 Correct 1 ms 344 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 348 KB correct
14 Correct 4 ms 604 KB correct
15 Correct 3 ms 604 KB correct
16 Correct 4 ms 472 KB correct
17 Correct 3 ms 604 KB correct
18 Correct 2 ms 348 KB correct
19 Correct 3 ms 604 KB correct
20 Correct 5 ms 604 KB correct
21 Correct 3 ms 344 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 4 ms 564 KB correct
24 Correct 4 ms 348 KB correct
25 Correct 2 ms 348 KB correct
26 Correct 2 ms 348 KB correct
27 Correct 3 ms 600 KB correct
28 Correct 2 ms 348 KB correct
29 Correct 2 ms 348 KB correct
30 Correct 2 ms 348 KB correct
31 Correct 3 ms 348 KB correct
32 Correct 2 ms 348 KB correct
33 Correct 3 ms 344 KB correct
34 Correct 117 ms 4212 KB correct
35 Correct 105 ms 3932 KB correct
36 Correct 92 ms 2904 KB correct
37 Correct 40 ms 668 KB correct
38 Correct 110 ms 4068 KB correct
39 Correct 112 ms 3648 KB correct
40 Correct 99 ms 2964 KB correct
41 Correct 99 ms 4188 KB correct
42 Correct 107 ms 4192 KB correct
43 Correct 77 ms 2476 KB correct
44 Correct 71 ms 2092 KB correct
45 Correct 71 ms 2140 KB correct
46 Correct 68 ms 1892 KB correct
47 Correct 51 ms 1112 KB correct
48 Correct 20 ms 348 KB correct
49 Correct 34 ms 600 KB correct
50 Correct 50 ms 1112 KB correct
51 Correct 87 ms 2140 KB correct
52 Correct 66 ms 1880 KB correct
53 Correct 64 ms 1896 KB correct
54 Correct 85 ms 2472 KB correct
55 Correct 71 ms 2396 KB correct
56 Correct 80 ms 2372 KB correct
57 Correct 74 ms 2136 KB correct
58 Correct 0 ms 348 KB correct
59 Correct 1 ms 348 KB correct
60 Correct 370 ms 10880 KB correct
61 Correct 634 ms 16900 KB correct
62 Correct 855 ms 16920 KB correct
63 Correct 621 ms 16708 KB correct
64 Correct 591 ms 16704 KB correct
65 Correct 605 ms 16912 KB correct
66 Correct 618 ms 16792 KB correct
67 Correct 636 ms 16708 KB correct
68 Correct 629 ms 16496 KB correct
69 Correct 640 ms 16716 KB correct
70 Correct 1 ms 348 KB correct
71 Correct 636 ms 16660 KB correct
72 Correct 629 ms 16704 KB correct
73 Correct 0 ms 348 KB correct
74 Correct 631 ms 16708 KB correct
75 Correct 605 ms 15956 KB correct
76 Correct 308 ms 6228 KB correct
77 Correct 615 ms 16468 KB correct
78 Correct 622 ms 16468 KB correct
79 Correct 685 ms 16604 KB correct
80 Correct 639 ms 16212 KB correct
81 Correct 545 ms 13816 KB correct
82 Correct 616 ms 16120 KB correct
83 Correct 449 ms 8576 KB correct
84 Correct 412 ms 9928 KB correct
85 Correct 392 ms 8816 KB correct
86 Correct 352 ms 6352 KB correct
87 Correct 325 ms 4596 KB correct
88 Correct 284 ms 3676 KB correct
89 Correct 269 ms 3584 KB correct
90 Correct 255 ms 3032 KB correct
91 Correct 142 ms 860 KB correct
92 Correct 99 ms 600 KB correct
93 Correct 394 ms 8968 KB correct
94 Correct 339 ms 6368 KB correct
95 Correct 343 ms 6012 KB correct
96 Correct 264 ms 3164 KB correct
97 Correct 280 ms 3760 KB correct
98 Correct 306 ms 4440 KB correct
99 Correct 270 ms 3672 KB correct
100 Correct 188 ms 1116 KB correct
101 Correct 100 ms 692 KB correct
102 Correct 391 ms 8680 KB correct
103 Correct 406 ms 8684 KB correct
104 Correct 386 ms 8528 KB correct
105 Correct 399 ms 8624 KB correct