oj.uz

Submission #1113742

# Submission time Handle Problem Language Result Execution time Memory
1113742 2024-11-17T10:00:02 Z epicci23 Simurgh (IOI17_simurgh) C++17
51 / 100
 664 ms 3284 KB 
#include "bits/stdc++.h"
#include "simurgh.h"
//#define int long long
#define all(v) v.begin() , v.end()
#define sz(a) (int)a.size()
using namespace std;
 
const int N = 505;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

struct DSU{
  vector<int> par,siz;
  stack<array<int,2>> st;
  DSU(int _n){
    siz.assign(_n,1);
    par.assign(_n,0);
    iota(all(par),0);
  }
  int find(int a){
    if(par[a]==a) return a;
    return find(par[a]);
  }
  void unite(int a,int b){
    a=find(a),b=find(b);
    if(a==b) return;
    if(siz[a]>siz[b]) swap(a,b);
    st.push({a,b});
    par[a]=b;
    siz[b]+=siz[a];
  }
  void rollback(){
  	if(st.empty()) return;
  	auto x = st.top();
  	st.pop();
    par[x[0]] = x[0];
    siz[x[1]] -= siz[x[0]];
  }
};
 
vector<array<int,2>> edges;
vector<int> kader;
int n,m,tot=0;
 
bool check(int a){
  vector<int> vis(m, 0);
 
  if(kader[a] == -1) return 0;
  if(kader[a] == 1) return 1;
  if(count(all(kader),1) == n - 1) return 0;
  
  vector<int> span;
  DSU dsu(n),dsu2(n);
 
  for(int x = 0; x < m ; x++){
  	if(kader[x] != 1) continue;
  	span.push_back(x);
  	vis[x] = 1;
  	dsu.unite(edges[x][0],edges[x][1]);
  	dsu2.unite(edges[x][0],edges[x][1]);
  }
 
  if(dsu.find(edges[a][0])==dsu.find(edges[a][1])){
  	kader[a] = -1;
  	return 0;
  }

  dsu.unite(edges[a][0],edges[a][1]);
  int sil = sz(span);
  vis[a] = 1;
  span.push_back(a);
 
  for(int i = a + 1; i < m ; i++){
  	if(dsu.find(edges[i][0]) == dsu.find(edges[i][1])) continue;
  	if(kader[i] != 0) continue;
  	dsu.unite(edges[i][0],edges[i][1]);
  	dsu2.unite(edges[i][0],edges[i][1]);
  	vis[i] = 1;
    span.push_back(i);
  }
 
  int kaydet = count_common_roads(span);
  span.erase(span.begin()+sil);
 
  vector<int> same;
  same.push_back(a);
 
  for(int i = a + 1; i < m ; i++){
  	if(vis[i]) continue;
  	if(kader[i] != 0) continue;
    if(dsu2.find(edges[i][0]) == dsu2.find(edges[i][1])) continue;
    if(sz(same)+tot>=n){
      for(int U : same) kader[U] = -1;
      return 0;
    }
    dsu2.unite(edges[i][0],edges[i][1]);
    span.push_back(i);
    int kaydet2 = count_common_roads(span);
    if(kaydet2 == kaydet + 1){
    	for(int U : same) kader[U] = -1;
    	kader[i] = 1;
      tot++;
    	return 0;
    }
    else if(kaydet2 == kaydet - 1){
    	for(int U : same) kader[U] = 1;
      tot += sz(same);
    	kader[i] = -1;
    	return 1;
    }
    else same.push_back(i);
    span.pop_back();
    dsu2.rollback();
  }
   
  for(int U : same) kader[U] = 1;
  tot += sz(same);
  return 1;
}
 
vector<int> find_roads(int _n, vector<int> u, vector<int> v){
  m = sz(u), n = _n;
  kader.assign(m, 0);
  for(int i=0;i<m;i++) edges.push_back({u[i],v[i]});
  vector<int> D(m,0);
  iota(all(D),0);
  shuffle(all(D),rng);
  for(int i=0;i<m;i++) check(i);
  vector<int> ans;
  for(int i=0;i<m;i++) if(kader[i]==1) ans.push_back(i);
  return ans;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 504 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 504 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct
14 Correct 3 ms 336 KB correct
15 Correct 5 ms 336 KB correct
16 Correct 3 ms 336 KB correct
17 Correct 3 ms 336 KB correct
18 Correct 1 ms 336 KB correct
19 Correct 3 ms 336 KB correct
20 Correct 3 ms 336 KB correct
21 Correct 3 ms 336 KB correct
22 Correct 2 ms 336 KB correct
23 Correct 1 ms 508 KB correct
24 Correct 1 ms 336 KB correct
25 Correct 1 ms 336 KB correct
26 Correct 2 ms 336 KB correct
27 Correct 1 ms 444 KB correct
28 Correct 1 ms 508 KB correct
29 Correct 1 ms 336 KB correct
30 Correct 1 ms 336 KB correct
31 Correct 1 ms 336 KB correct
32 Correct 1 ms 336 KB correct
33 Correct 1 ms 336 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 504 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct
14 Correct 3 ms 336 KB correct
15 Correct 5 ms 336 KB correct
16 Correct 3 ms 336 KB correct
17 Correct 3 ms 336 KB correct
18 Correct 1 ms 336 KB correct
19 Correct 3 ms 336 KB correct
20 Correct 3 ms 336 KB correct
21 Correct 3 ms 336 KB correct
22 Correct 2 ms 336 KB correct
23 Correct 1 ms 508 KB correct
24 Correct 1 ms 336 KB correct
25 Correct 1 ms 336 KB correct
26 Correct 2 ms 336 KB correct
27 Correct 1 ms 444 KB correct
28 Correct 1 ms 508 KB correct
29 Correct 1 ms 336 KB correct
30 Correct 1 ms 336 KB correct
31 Correct 1 ms 336 KB correct
32 Correct 1 ms 336 KB correct
33 Correct 1 ms 336 KB correct
34 Correct 475 ms 1360 KB correct
35 Correct 386 ms 1360 KB correct
36 Correct 278 ms 1276 KB correct
37 Correct 9 ms 492 KB correct
38 Correct 388 ms 1360 KB correct
39 Correct 344 ms 1228 KB correct
40 Correct 267 ms 1104 KB correct
41 Correct 664 ms 1360 KB correct
42 Correct 651 ms 1360 KB correct
43 Correct 422 ms 848 KB correct
44 Correct 266 ms 848 KB correct
45 Correct 234 ms 848 KB correct
46 Correct 155 ms 848 KB correct
47 Correct 49 ms 592 KB correct
48 Correct 4 ms 336 KB correct
49 Correct 10 ms 336 KB correct
50 Correct 34 ms 592 KB correct
51 Correct 400 ms 976 KB correct
52 Correct 291 ms 848 KB correct
53 Correct 198 ms 848 KB correct
54 Correct 269 ms 968 KB correct
55 Correct 205 ms 848 KB correct
56 Correct 207 ms 848 KB correct
57 Correct 216 ms 848 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 504 KB correct
3 Incorrect 197 ms 3284 KB WA in grader: NO
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 504 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct
14 Correct 3 ms 336 KB correct
15 Correct 5 ms 336 KB correct
16 Correct 3 ms 336 KB correct
17 Correct 3 ms 336 KB correct
18 Correct 1 ms 336 KB correct
19 Correct 3 ms 336 KB correct
20 Correct 3 ms 336 KB correct
21 Correct 3 ms 336 KB correct
22 Correct 2 ms 336 KB correct
23 Correct 1 ms 508 KB correct
24 Correct 1 ms 336 KB correct
25 Correct 1 ms 336 KB correct
26 Correct 2 ms 336 KB correct
27 Correct 1 ms 444 KB correct
28 Correct 1 ms 508 KB correct
29 Correct 1 ms 336 KB correct
30 Correct 1 ms 336 KB correct
31 Correct 1 ms 336 KB correct
32 Correct 1 ms 336 KB correct
33 Correct 1 ms 336 KB correct
34 Correct 475 ms 1360 KB correct
35 Correct 386 ms 1360 KB correct
36 Correct 278 ms 1276 KB correct
37 Correct 9 ms 492 KB correct
38 Correct 388 ms 1360 KB correct
39 Correct 344 ms 1228 KB correct
40 Correct 267 ms 1104 KB correct
41 Correct 664 ms 1360 KB correct
42 Correct 651 ms 1360 KB correct
43 Correct 422 ms 848 KB correct
44 Correct 266 ms 848 KB correct
45 Correct 234 ms 848 KB correct
46 Correct 155 ms 848 KB correct
47 Correct 49 ms 592 KB correct
48 Correct 4 ms 336 KB correct
49 Correct 10 ms 336 KB correct
50 Correct 34 ms 592 KB correct
51 Correct 400 ms 976 KB correct
52 Correct 291 ms 848 KB correct
53 Correct 198 ms 848 KB correct
54 Correct 269 ms 968 KB correct
55 Correct 205 ms 848 KB correct
56 Correct 207 ms 848 KB correct
57 Correct 216 ms 848 KB correct
58 Correct 1 ms 336 KB correct
59 Correct 1 ms 504 KB correct
60 Incorrect 197 ms 3284 KB WA in grader: NO
61 Halted 0 ms 0 KB -