Submission #1093578

# Submission time Handle Problem Language Result Execution time Memory
1093578 2024-09-27T04:12:00 Z zNatsumi Joker (BOI20_joker) C++17
6 / 100
717 ms 19196 KB
#include <bits/stdc++.h>

using namespace std;

#define ii pair<int, int>
#define tp tuple<int, int, int>
#define fi first
#define se second
#define all(x) x.begin(), x.end()

const int N = 2e5 + 5,
          block = 448;

int n, m, q;
ii edge[N];
bool pre, res[N];
int pa[N], sz[N], lz[N], it;
pair<int*, int> trace[3*N];
vector<tp> que[block + 5];

int fset(int i, int &c){
  c ^= lz[i];
  return i == pa[i] ? i : fset(pa[i], c);
}

bool uset(int u, int v){
  int cu = 0, cv = 0;
  u = fset(u, cu);
  v = fset(v, cv);
  if(u == v){
    if(cu == cv) return true;
    return false;
  }
  if(sz[u] < sz[v]) swap(u, v);
  trace[it++] = {pa + v, pa[v]}; pa[v] = u;
  trace[it++] = {sz + u, sz[u]}; sz[u] += sz[v];
  if(cu == cv){
    trace[it++] = {lz + v, lz[v]};
    lz[v] ^= 1;
  }
  return false;
}

void rollback(int t){
  for(; it > t; ){
    it--;
    *trace[it].fi = trace[it].se;
  }
}

int getblock(int i){
  return (i - 1) / block + 1;
}

void solve(int b, vector<tp> &query){
  if(query.empty()) return;
  int lst = m;
  int flag = it;

  bool val = false;
  for(auto x : query){
    int l, r, idx; tie(r, l, idx) = x;

    if(r <= b*block){
      for(int i = lst; i > b * block; i--) uset(edge[i].fi, edge[i].se);
      int tmp = it;
      bool ok = false;

      for(int i = (b - 1) * block + 1; i <= min(b * block, m); i++){
        if(l <= i && i <= r) continue;

        if(uset(edge[i].fi, edge[i].se)){
          ok = true;
          break;
        }
      }
      res[idx] = ok;
      rollback(tmp);
    }else{
      for(int i = lst; i > r; i--)
        val |= uset(edge[i].fi, edge[i].se);

      lst = r;

      int tmp = it;
      bool dd = false;
      for(int i = (b - 1) * block + 1; i < l; i++) dd |= uset(edge[i].fi, edge[i].se);

      res[idx] = dd | val | pre;
      rollback(tmp);
    }
  }
  rollback(flag);
  for(int i = (b - 1) * block; i <= min(b * block, m); i++) pre |= uset(edge[i].fi, edge[i].se);
}


int32_t main(){
  cin.tie(0)->sync_with_stdio(0);
//  #define task "test"
//  if(fopen(task ".inp", "r")){
//    freopen(task ".inp", "r", stdin);
//    freopen(task ".out", "w", stdout);
//  }

  cin >> n >> m >> q;
  for(int i = 1; i <= m; i++){
    int u, v; cin >> u >> v;
    edge[i] = {u, v};
  }

  for(int t = 1; t <= q; t++){
    int l, r; cin >> l >> r;
    que[getblock(l)].push_back({r, l, t});
  }
  for(int i = 1; i <= block; i++) sort(all(que[i]), greater<>());
  for(int i = 1; i <= n; i++){
    pa[i] = i;
    sz[i] = 1;
    lz[i] = 0;
  }
  for(int i = 1; i <= block; i++) solve(i, que[i]);

  for(int i = 1; i <= q; i++) cout << (res[i] ? "YES\n" : "NO\n");

  return 0;
}
# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 480 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 480 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 480 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 480 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Incorrect 7 ms 564 KB Output isn't correct
30 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 62 ms 14268 KB Output is correct
4 Correct 717 ms 19196 KB Output is correct
5 Correct 72 ms 18876 KB Output is correct
6 Correct 68 ms 14468 KB Output is correct
7 Correct 69 ms 14524 KB Output is correct
8 Incorrect 68 ms 11972 KB Output isn't correct
9 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 480 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 480 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 62 ms 14268 KB Output is correct
30 Correct 717 ms 19196 KB Output is correct
31 Correct 72 ms 18876 KB Output is correct
32 Correct 68 ms 14468 KB Output is correct
33 Correct 69 ms 14524 KB Output is correct
34 Incorrect 68 ms 11972 KB Output isn't correct
35 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 480 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 480 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Incorrect 7 ms 564 KB Output isn't correct
30 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 480 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 480 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Incorrect 7 ms 564 KB Output isn't correct
30 Halted 0 ms 0 KB -