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Submission #877218

# Submission time Handle Problem Language Result Execution time Memory
877218 2023-11-23T03:57:58 Z hotboy2703 Joker (BOI20_joker) C++14
49 / 100
 2000 ms 14812 KB 
#include<bits/stdc++.h>
using namespace std;
#define pll pair <ll,ll>
#define fi first
#define se second
using ll = int;
ll n,m,q;
namespace DSU{
    ll dsu[200100];
    ll rev[200100];
    void init(){
        memset(dsu,-1,sizeof dsu);
        memset(rev,-1,sizeof rev);
    }
    ll f(ll x){
        if (dsu[x] < 0)return x;
        return (dsu[x] = f(dsu[x]));
    }
    void m(ll x,ll y){
        if (x == -1 || y == -1)return;
        if (dsu[x] > dsu[y])swap(x,y);
        dsu[x] += dsu[y];
        dsu[y] = x;
    }
    bool join(ll x,ll y){
        x = f(x),y = f(y);
        if (x==y)return 0;
        if (rev[x] == y)return 1;
        else{
            m(x,rev[y]);
            m(rev[x],y);
            x = f(x);
            y = f(y);
            rev[x] = y;
            rev[y] = x;
            return 1;
        }
    }
}
pll a[200100];
ll color[200100];
ll pre[200100];
vector <ll> g[200100];
int main(){
    ios_base::sync_with_stdio(0);cin.tie(nullptr);cout.tie(nullptr);
    cin>>n>>m>>q;
    for (ll i = 1;i <= m;i ++)cin>>a[i].fi>>a[i].se;

    if (q <= 2000){
        while (q--){
            ll l,r;
            cin>>l>>r;
            for (ll i = 1;i <= n;i ++){
                color[i] = -1;
                g[i].clear();
            }
            for (ll i = 1;i < l;i ++){
                g[a[i].fi].push_back(a[i].se);
                g[a[i].se].push_back(a[i].fi);
            }
            for (ll i = r + 1;i <= m;i ++){
                g[a[i].fi].push_back(a[i].se);
                g[a[i].se].push_back(a[i].fi);
            }
            bool ok = 0;
            for (ll i = 1;i <= n;i ++){
                if (color[i] == -1){
                    color[i] = 0;
                    queue <ll> q;
                    q.push(i);
                    while (!q.empty()){
                        ll u = q.front();
                        q.pop();
                        for (auto v:g[u]){
                            if (color[v] == -1){
                                color[v] = 1-color[u];
                                q.push(v);
                            }
                            else{
                                if (color[v] == color[u]){
                                    ok = 1;
                                    break;
                                }
                            }
                        }
                    }
                    if (ok)break;
                }
            }
            cout<<(ok?"YES":"NO")<<'\n';
        }
    }
    else{
        for (ll i = 0;i < m;i ++){
            pre[i] = m+1;
        }
        for (ll i = 0;i < min(m,201);i ++){
            DSU::init();
            bool ok = 1;
            for (ll j = 1;j <= i;j ++){
                ok &= DSU::join(a[j].fi,a[j].se);
            }
            if (ok == 0)break;
            while (pre[i] > i + 1 && DSU::join(a[pre[i]-1].fi,a[pre[i] - 1].se)){
                pre[i]--;
            }
        }
        for (ll i = 1;i <= q;i ++){
            ll l,r;
            cin>>l>>r;
            if (r < pre[l-1] - 1){
                cout<<"YES";
            }
            else{
                cout<<"NO";
            }
            cout<<'\n';
        }
    }
    return 0;
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6796 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 2 ms 6748 KB Output is correct
11 Correct 2 ms 6748 KB Output is correct
12 Correct 2 ms 6800 KB Output is correct
13 Correct 2 ms 6744 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct
15 Correct 2 ms 6748 KB Output is correct
16 Correct 2 ms 6748 KB Output is correct
17 Correct 2 ms 6748 KB Output is correct
18 Correct 2 ms 6588 KB Output is correct
19 Correct 2 ms 6748 KB Output is correct
20 Correct 2 ms 6748 KB Output is correct
21 Correct 2 ms 6748 KB Output is correct
22 Correct 2 ms 6748 KB Output is correct
23 Correct 2 ms 6748 KB Output is correct
24 Correct 2 ms 6792 KB Output is correct
25 Correct 2 ms 6748 KB Output is correct
26 Correct 2 ms 6748 KB Output is correct
27 Correct 2 ms 6748 KB Output is correct
28 Correct 2 ms 6748 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6796 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 2 ms 6748 KB Output is correct
11 Correct 2 ms 6748 KB Output is correct
12 Correct 2 ms 6800 KB Output is correct
13 Correct 2 ms 6744 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct
15 Correct 2 ms 6748 KB Output is correct
16 Correct 2 ms 6748 KB Output is correct
17 Correct 2 ms 6748 KB Output is correct
18 Correct 2 ms 6588 KB Output is correct
19 Correct 2 ms 6748 KB Output is correct
20 Correct 2 ms 6748 KB Output is correct
21 Correct 2 ms 6748 KB Output is correct
22 Correct 2 ms 6748 KB Output is correct
23 Correct 2 ms 6748 KB Output is correct
24 Correct 2 ms 6792 KB Output is correct
25 Correct 2 ms 6748 KB Output is correct
26 Correct 2 ms 6748 KB Output is correct
27 Correct 2 ms 6748 KB Output is correct
28 Correct 2 ms 6748 KB Output is correct
29 Correct 114 ms 6836 KB Output is correct
30 Correct 88 ms 6748 KB Output is correct
31 Correct 78 ms 6748 KB Output is correct
32 Correct 54 ms 6744 KB Output is correct
33 Correct 35 ms 6748 KB Output is correct
34 Correct 76 ms 6868 KB Output is correct
35 Correct 101 ms 6876 KB Output is correct
36 Correct 30 ms 6744 KB Output is correct
37 Correct 80 ms 6996 KB Output is correct
38 Correct 56 ms 6748 KB Output is correct
39 Correct 84 ms 6744 KB Output is correct
40 Correct 57 ms 6748 KB Output is correct
41 Correct 57 ms 6748 KB Output is correct
42 Correct 57 ms 7000 KB Output is correct
43 Correct 28 ms 6744 KB Output is correct
44 Correct 39 ms 6744 KB Output is correct
45 Correct 50 ms 6744 KB Output is correct
46 Correct 54 ms 6744 KB Output is correct
47 Correct 51 ms 7004 KB Output is correct
48 Correct 54 ms 6748 KB Output is correct
49 Correct 68 ms 6744 KB Output is correct
50 Correct 92 ms 6744 KB Output is correct
51 Correct 43 ms 6872 KB Output is correct
52 Correct 57 ms 6748 KB Output is correct
53 Correct 75 ms 6748 KB Output is correct
54 Correct 91 ms 6748 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 412 ms 10344 KB Output is correct
4 Correct 985 ms 10580 KB Output is correct
5 Correct 116 ms 10376 KB Output is correct
6 Correct 114 ms 14440 KB Output is correct
7 Correct 120 ms 14416 KB Output is correct
8 Correct 262 ms 13844 KB Output is correct
9 Correct 293 ms 13920 KB Output is correct
10 Correct 559 ms 14040 KB Output is correct
11 Correct 519 ms 14368 KB Output is correct
12 Correct 487 ms 14420 KB Output is correct
13 Correct 251 ms 14364 KB Output is correct
14 Correct 276 ms 14328 KB Output is correct
15 Correct 483 ms 14304 KB Output is correct
16 Correct 548 ms 14420 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6796 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 2 ms 6748 KB Output is correct
11 Correct 2 ms 6748 KB Output is correct
12 Correct 2 ms 6800 KB Output is correct
13 Correct 2 ms 6744 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct
15 Correct 2 ms 6748 KB Output is correct
16 Correct 2 ms 6748 KB Output is correct
17 Correct 2 ms 6748 KB Output is correct
18 Correct 2 ms 6588 KB Output is correct
19 Correct 2 ms 6748 KB Output is correct
20 Correct 2 ms 6748 KB Output is correct
21 Correct 2 ms 6748 KB Output is correct
22 Correct 2 ms 6748 KB Output is correct
23 Correct 2 ms 6748 KB Output is correct
24 Correct 2 ms 6792 KB Output is correct
25 Correct 2 ms 6748 KB Output is correct
26 Correct 2 ms 6748 KB Output is correct
27 Correct 2 ms 6748 KB Output is correct
28 Correct 2 ms 6748 KB Output is correct
29 Correct 412 ms 10344 KB Output is correct
30 Correct 985 ms 10580 KB Output is correct
31 Correct 116 ms 10376 KB Output is correct
32 Correct 114 ms 14440 KB Output is correct
33 Correct 120 ms 14416 KB Output is correct
34 Correct 262 ms 13844 KB Output is correct
35 Correct 293 ms 13920 KB Output is correct
36 Correct 559 ms 14040 KB Output is correct
37 Correct 519 ms 14368 KB Output is correct
38 Correct 487 ms 14420 KB Output is correct
39 Correct 251 ms 14364 KB Output is correct
40 Correct 276 ms 14328 KB Output is correct
41 Correct 483 ms 14304 KB Output is correct
42 Correct 548 ms 14420 KB Output is correct
43 Correct 420 ms 14724 KB Output is correct
44 Correct 983 ms 14292 KB Output is correct
45 Correct 890 ms 14808 KB Output is correct
46 Correct 91 ms 14760 KB Output is correct
47 Correct 100 ms 14576 KB Output is correct
48 Correct 341 ms 14424 KB Output is correct
49 Correct 603 ms 14552 KB Output is correct
50 Correct 548 ms 14552 KB Output is correct
51 Correct 550 ms 14812 KB Output is correct
52 Correct 508 ms 14804 KB Output is correct
53 Correct 229 ms 14428 KB Output is correct
54 Correct 327 ms 14784 KB Output is correct
55 Correct 485 ms 14808 KB Output is correct
56 Correct 582 ms 14804 KB Output is correct

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6796 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 2 ms 6748 KB Output is correct
11 Correct 2 ms 6748 KB Output is correct
12 Correct 2 ms 6800 KB Output is correct
13 Correct 2 ms 6744 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct
15 Correct 2 ms 6748 KB Output is correct
16 Correct 2 ms 6748 KB Output is correct
17 Correct 2 ms 6748 KB Output is correct
18 Correct 2 ms 6588 KB Output is correct
19 Correct 2 ms 6748 KB Output is correct
20 Correct 2 ms 6748 KB Output is correct
21 Correct 2 ms 6748 KB Output is correct
22 Correct 2 ms 6748 KB Output is correct
23 Correct 2 ms 6748 KB Output is correct
24 Correct 2 ms 6792 KB Output is correct
25 Correct 2 ms 6748 KB Output is correct
26 Correct 2 ms 6748 KB Output is correct
27 Correct 2 ms 6748 KB Output is correct
28 Correct 2 ms 6748 KB Output is correct
29 Correct 114 ms 6836 KB Output is correct
30 Correct 88 ms 6748 KB Output is correct
31 Correct 78 ms 6748 KB Output is correct
32 Correct 54 ms 6744 KB Output is correct
33 Correct 35 ms 6748 KB Output is correct
34 Correct 76 ms 6868 KB Output is correct
35 Correct 101 ms 6876 KB Output is correct
36 Correct 30 ms 6744 KB Output is correct
37 Correct 80 ms 6996 KB Output is correct
38 Correct 56 ms 6748 KB Output is correct
39 Correct 84 ms 6744 KB Output is correct
40 Correct 57 ms 6748 KB Output is correct
41 Correct 57 ms 6748 KB Output is correct
42 Correct 57 ms 7000 KB Output is correct
43 Correct 28 ms 6744 KB Output is correct
44 Correct 39 ms 6744 KB Output is correct
45 Correct 50 ms 6744 KB Output is correct
46 Correct 54 ms 6744 KB Output is correct
47 Correct 51 ms 7004 KB Output is correct
48 Correct 54 ms 6748 KB Output is correct
49 Correct 68 ms 6744 KB Output is correct
50 Correct 92 ms 6744 KB Output is correct
51 Correct 43 ms 6872 KB Output is correct
52 Correct 57 ms 6748 KB Output is correct
53 Correct 75 ms 6748 KB Output is correct
54 Correct 91 ms 6748 KB Output is correct
55 Execution timed out 2004 ms 14288 KB Time limit exceeded
56 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6796 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 2 ms 6748 KB Output is correct
11 Correct 2 ms 6748 KB Output is correct
12 Correct 2 ms 6800 KB Output is correct
13 Correct 2 ms 6744 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct
15 Correct 2 ms 6748 KB Output is correct
16 Correct 2 ms 6748 KB Output is correct
17 Correct 2 ms 6748 KB Output is correct
18 Correct 2 ms 6588 KB Output is correct
19 Correct 2 ms 6748 KB Output is correct
20 Correct 2 ms 6748 KB Output is correct
21 Correct 2 ms 6748 KB Output is correct
22 Correct 2 ms 6748 KB Output is correct
23 Correct 2 ms 6748 KB Output is correct
24 Correct 2 ms 6792 KB Output is correct
25 Correct 2 ms 6748 KB Output is correct
26 Correct 2 ms 6748 KB Output is correct
27 Correct 2 ms 6748 KB Output is correct
28 Correct 2 ms 6748 KB Output is correct
29 Correct 114 ms 6836 KB Output is correct
30 Correct 88 ms 6748 KB Output is correct
31 Correct 78 ms 6748 KB Output is correct
32 Correct 54 ms 6744 KB Output is correct
33 Correct 35 ms 6748 KB Output is correct
34 Correct 76 ms 6868 KB Output is correct
35 Correct 101 ms 6876 KB Output is correct
36 Correct 30 ms 6744 KB Output is correct
37 Correct 80 ms 6996 KB Output is correct
38 Correct 56 ms 6748 KB Output is correct
39 Correct 84 ms 6744 KB Output is correct
40 Correct 57 ms 6748 KB Output is correct
41 Correct 57 ms 6748 KB Output is correct
42 Correct 57 ms 7000 KB Output is correct
43 Correct 28 ms 6744 KB Output is correct
44 Correct 39 ms 6744 KB Output is correct
45 Correct 50 ms 6744 KB Output is correct
46 Correct 54 ms 6744 KB Output is correct
47 Correct 51 ms 7004 KB Output is correct
48 Correct 54 ms 6748 KB Output is correct
49 Correct 68 ms 6744 KB Output is correct
50 Correct 92 ms 6744 KB Output is correct
51 Correct 43 ms 6872 KB Output is correct
52 Correct 57 ms 6748 KB Output is correct
53 Correct 75 ms 6748 KB Output is correct
54 Correct 91 ms 6748 KB Output is correct
55 Correct 412 ms 10344 KB Output is correct
56 Correct 985 ms 10580 KB Output is correct
57 Correct 116 ms 10376 KB Output is correct
58 Correct 114 ms 14440 KB Output is correct
59 Correct 120 ms 14416 KB Output is correct
60 Correct 262 ms 13844 KB Output is correct
61 Correct 293 ms 13920 KB Output is correct
62 Correct 559 ms 14040 KB Output is correct
63 Correct 519 ms 14368 KB Output is correct
64 Correct 487 ms 14420 KB Output is correct
65 Correct 251 ms 14364 KB Output is correct
66 Correct 276 ms 14328 KB Output is correct
67 Correct 483 ms 14304 KB Output is correct
68 Correct 548 ms 14420 KB Output is correct
69 Correct 420 ms 14724 KB Output is correct
70 Correct 983 ms 14292 KB Output is correct
71 Correct 890 ms 14808 KB Output is correct
72 Correct 91 ms 14760 KB Output is correct
73 Correct 100 ms 14576 KB Output is correct
74 Correct 341 ms 14424 KB Output is correct
75 Correct 603 ms 14552 KB Output is correct
76 Correct 548 ms 14552 KB Output is correct
77 Correct 550 ms 14812 KB Output is correct
78 Correct 508 ms 14804 KB Output is correct
79 Correct 229 ms 14428 KB Output is correct
80 Correct 327 ms 14784 KB Output is correct
81 Correct 485 ms 14808 KB Output is correct
82 Correct 582 ms 14804 KB Output is correct
83 Execution timed out 2004 ms 14288 KB Time limit exceeded
84 Halted 0 ms 0 KB -