oj.uz

Submission #1093669

# Submission time Handle Problem Language Result Execution time Memory
1093669 2024-09-27T08:08:11 Z duyhoanho Joker (BOI20_joker) C++14
39 / 100
 95 ms 22132 KB 
#include<bits/stdc++.h>
#define int long long
#define forinc(i,a,b) for(int i=a;i<=b;i++)
#define fi first
#define se second
#define pii pair<int,int>
#define pb push_back
using namespace std;
const int N = 2e5+10;
int n,m,q,fre[N],lz[N],p[N],sz[N];
int ans[N];
pii d[N];
vector<int> ad[N];
//sub1
bool qu1(int l,int r)
{
    bool ok = 0;
    forinc(i,1,n) ad[i].clear();
    forinc(i,1,m)
    {
        if(l<=i && i<=r) continue;
        int x,y;
        tie(x,y) = d[i];
        ad[x].pb(y);
        ad[y].pb(x);
    }

    for(int i=1; i<=n; i++) fre[i] = -1;
    for(int i=1; i<=n; i++)
    {
        if(fre[i] == -1)
        {
            queue<int> q;
            q.push(i);
            fre[i] = 0;
            while(q.size())
            {
                int u = q.front();
                q.pop();
                for(int v:ad[u])
                {
                    if(fre[v] == fre[u]) return true;
                    if(fre[v] != -1) continue;
                    fre[v] = 1 - fre[u];
                    q.push(v);
                }

            }
        }
    }
    return false;
}
//sub2
struct node
{
  int l,r,id;
}qu[N];
bool cmp(node a,node b)
{
  return a.r > b.r;
}
int pa(int v,int &c)
{
    c ^= lz[v];
    if(p[v] == v) return v;
    return pa(p[v], c);
}
void join(int a,int b)
{
    int ca = 0;
    int cb = 0;
    a = pa(a,ca);
    b = pa(b,cb);
    if(a != b)
    {
        if(sz[a] < sz[b]) swap(a,b);
        sz[a] += sz[b];
        p[b] = a;
        if(ca == cb) lz[b] = 1;
    }
}
bool check(int a,int b)
{
    int ca = 0;
    int cb = 0;
    a = pa(a,ca);
    b = pa(b,cb);
    if(a == b && ca == cb) return true;
    return false;
}
//bool qu2(int l,int r)
//{
//    for(int i=1; i<=m; i++)
//    {
//        if(l<=i && i<=r) continue;
//        if(check(d[i].fi, d[i].se)) return true;
//        join(d[i].fi, d[i].se);
//    }
//    return false;
//}
int32_t main()
{
    if(fopen("task.inp","r"))
    {
        freopen("task.inp","r",stdin);
        freopen("task.out","w",stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>m>>q;
    forinc(i,1,m)
    {
        int x,y;
        cin>>x>>y;
        d[i] = {x,y};
    }
    if(n<=2000 && m <= 2000 && q <= 2000)
    {
        while(q--)
        {
            int l,r;
            cin>>l>>r;
            cout<< (qu1(l,r) ? "YES\n" : "NO\n");
        }
        return 0;

    }
    forinc(i,1,n)
    {
        sz[i] = 1;
        p[i] = i;
        lz[i] = 0;
    }

    forinc(i,1,q)
    {
        int l,r;
        cin>>l>>r;
        qu[i] = {l,r,i};
    }
    sort(qu + 1 , qu + q + 1,cmp);
    bool ok=0;
    for(int i = m; i>qu[1].r ;i--)
    {
      if(check(d[i].fi , d[i].se)) ok=1;
      join(d[i].fi,d[i].se);
    }
    ans[qu[1].id] = ok;
    for(int i=2;i<=q;i++)
    {
      for(int j = qu[i-1].r;j>qu[i].r;j--)
      {
        if(check(d[j].fi,d[j].se)) ok = 1;
        join(d[j].fi , d[j].se);
      }
      ans[qu[i].id] = ok;
    }
    forinc(i,1,q) cout<<(ans[i] ? "YES\n" : "NO\n");
}

Compilation message

Joker.cpp: In function 'bool qu1(long long int, long long int)':
Joker.cpp:17:10: warning: unused variable 'ok' [-Wunused-variable]
   17 |     bool ok = 0;
      |          ^~
Joker.cpp: In function 'int32_t main()':
Joker.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen("task.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Joker.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen("task.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 2 ms 4956 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 3 ms 5172 KB Output is correct
8 Correct 3 ms 4956 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 4956 KB Output is correct
11 Correct 3 ms 4956 KB Output is correct
12 Correct 4 ms 4952 KB Output is correct
13 Correct 3 ms 4956 KB Output is correct
14 Correct 3 ms 4952 KB Output is correct
15 Correct 3 ms 4956 KB Output is correct
16 Correct 3 ms 4956 KB Output is correct
17 Correct 3 ms 5196 KB Output is correct
18 Correct 4 ms 4956 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4952 KB Output is correct
21 Correct 2 ms 5168 KB Output is correct
22 Correct 3 ms 4956 KB Output is correct
23 Correct 3 ms 4956 KB Output is correct
24 Correct 2 ms 4956 KB Output is correct
25 Correct 3 ms 4956 KB Output is correct
26 Correct 2 ms 4956 KB Output is correct
27 Correct 3 ms 4956 KB Output is correct
28 Correct 3 ms 5176 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 2 ms 4956 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 3 ms 5172 KB Output is correct
8 Correct 3 ms 4956 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 4956 KB Output is correct
11 Correct 3 ms 4956 KB Output is correct
12 Correct 4 ms 4952 KB Output is correct
13 Correct 3 ms 4956 KB Output is correct
14 Correct 3 ms 4952 KB Output is correct
15 Correct 3 ms 4956 KB Output is correct
16 Correct 3 ms 4956 KB Output is correct
17 Correct 3 ms 5196 KB Output is correct
18 Correct 4 ms 4956 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4952 KB Output is correct
21 Correct 2 ms 5168 KB Output is correct
22 Correct 3 ms 4956 KB Output is correct
23 Correct 3 ms 4956 KB Output is correct
24 Correct 2 ms 4956 KB Output is correct
25 Correct 3 ms 4956 KB Output is correct
26 Correct 2 ms 4956 KB Output is correct
27 Correct 3 ms 4956 KB Output is correct
28 Correct 3 ms 5176 KB Output is correct
29 Correct 95 ms 5464 KB Output is correct
30 Correct 66 ms 5208 KB Output is correct
31 Correct 48 ms 5208 KB Output is correct
32 Correct 27 ms 5212 KB Output is correct
33 Correct 18 ms 5324 KB Output is correct
34 Correct 53 ms 5320 KB Output is correct
35 Correct 70 ms 5208 KB Output is correct
36 Correct 37 ms 5208 KB Output is correct
37 Correct 91 ms 5212 KB Output is correct
38 Correct 77 ms 5328 KB Output is correct
39 Correct 72 ms 5308 KB Output is correct
40 Correct 41 ms 5208 KB Output is correct
41 Correct 38 ms 5208 KB Output is correct
42 Correct 37 ms 5208 KB Output is correct
43 Correct 18 ms 5208 KB Output is correct
44 Correct 21 ms 5208 KB Output is correct
45 Correct 25 ms 5212 KB Output is correct
46 Correct 30 ms 5212 KB Output is correct
47 Correct 33 ms 5212 KB Output is correct
48 Correct 37 ms 5212 KB Output is correct
49 Correct 54 ms 5208 KB Output is correct
50 Correct 68 ms 5212 KB Output is correct
51 Correct 27 ms 5212 KB Output is correct
52 Correct 35 ms 5208 KB Output is correct
53 Correct 47 ms 5324 KB Output is correct
54 Correct 67 ms 5212 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 74 ms 19668 KB Output is correct
4 Correct 70 ms 21840 KB Output is correct
5 Correct 76 ms 21584 KB Output is correct
6 Correct 70 ms 19796 KB Output is correct
7 Correct 74 ms 19796 KB Output is correct
8 Correct 68 ms 18516 KB Output is correct
9 Correct 80 ms 19536 KB Output is correct
10 Correct 75 ms 22056 KB Output is correct
11 Correct 71 ms 19792 KB Output is correct
12 Correct 71 ms 21604 KB Output is correct
13 Correct 70 ms 17876 KB Output is correct
14 Correct 76 ms 18772 KB Output is correct
15 Correct 74 ms 20556 KB Output is correct
16 Correct 74 ms 22132 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 2 ms 4956 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 3 ms 5172 KB Output is correct
8 Correct 3 ms 4956 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 4956 KB Output is correct
11 Correct 3 ms 4956 KB Output is correct
12 Correct 4 ms 4952 KB Output is correct
13 Correct 3 ms 4956 KB Output is correct
14 Correct 3 ms 4952 KB Output is correct
15 Correct 3 ms 4956 KB Output is correct
16 Correct 3 ms 4956 KB Output is correct
17 Correct 3 ms 5196 KB Output is correct
18 Correct 4 ms 4956 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4952 KB Output is correct
21 Correct 2 ms 5168 KB Output is correct
22 Correct 3 ms 4956 KB Output is correct
23 Correct 3 ms 4956 KB Output is correct
24 Correct 2 ms 4956 KB Output is correct
25 Correct 3 ms 4956 KB Output is correct
26 Correct 2 ms 4956 KB Output is correct
27 Correct 3 ms 4956 KB Output is correct
28 Correct 3 ms 5176 KB Output is correct
29 Correct 74 ms 19668 KB Output is correct
30 Correct 70 ms 21840 KB Output is correct
31 Correct 76 ms 21584 KB Output is correct
32 Correct 70 ms 19796 KB Output is correct
33 Correct 74 ms 19796 KB Output is correct
34 Correct 68 ms 18516 KB Output is correct
35 Correct 80 ms 19536 KB Output is correct
36 Correct 75 ms 22056 KB Output is correct
37 Correct 71 ms 19792 KB Output is correct
38 Correct 71 ms 21604 KB Output is correct
39 Correct 70 ms 17876 KB Output is correct
40 Correct 76 ms 18772 KB Output is correct
41 Correct 74 ms 20556 KB Output is correct
42 Correct 74 ms 22132 KB Output is correct
43 Incorrect 76 ms 19760 KB Output isn't correct
44 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 2 ms 4956 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 3 ms 5172 KB Output is correct
8 Correct 3 ms 4956 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 4956 KB Output is correct
11 Correct 3 ms 4956 KB Output is correct
12 Correct 4 ms 4952 KB Output is correct
13 Correct 3 ms 4956 KB Output is correct
14 Correct 3 ms 4952 KB Output is correct
15 Correct 3 ms 4956 KB Output is correct
16 Correct 3 ms 4956 KB Output is correct
17 Correct 3 ms 5196 KB Output is correct
18 Correct 4 ms 4956 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4952 KB Output is correct
21 Correct 2 ms 5168 KB Output is correct
22 Correct 3 ms 4956 KB Output is correct
23 Correct 3 ms 4956 KB Output is correct
24 Correct 2 ms 4956 KB Output is correct
25 Correct 3 ms 4956 KB Output is correct
26 Correct 2 ms 4956 KB Output is correct
27 Correct 3 ms 4956 KB Output is correct
28 Correct 3 ms 5176 KB Output is correct
29 Correct 95 ms 5464 KB Output is correct
30 Correct 66 ms 5208 KB Output is correct
31 Correct 48 ms 5208 KB Output is correct
32 Correct 27 ms 5212 KB Output is correct
33 Correct 18 ms 5324 KB Output is correct
34 Correct 53 ms 5320 KB Output is correct
35 Correct 70 ms 5208 KB Output is correct
36 Correct 37 ms 5208 KB Output is correct
37 Correct 91 ms 5212 KB Output is correct
38 Correct 77 ms 5328 KB Output is correct
39 Correct 72 ms 5308 KB Output is correct
40 Correct 41 ms 5208 KB Output is correct
41 Correct 38 ms 5208 KB Output is correct
42 Correct 37 ms 5208 KB Output is correct
43 Correct 18 ms 5208 KB Output is correct
44 Correct 21 ms 5208 KB Output is correct
45 Correct 25 ms 5212 KB Output is correct
46 Correct 30 ms 5212 KB Output is correct
47 Correct 33 ms 5212 KB Output is correct
48 Correct 37 ms 5212 KB Output is correct
49 Correct 54 ms 5208 KB Output is correct
50 Correct 68 ms 5212 KB Output is correct
51 Correct 27 ms 5212 KB Output is correct
52 Correct 35 ms 5208 KB Output is correct
53 Correct 47 ms 5324 KB Output is correct
54 Correct 67 ms 5212 KB Output is correct
55 Incorrect 31 ms 12096 KB Output isn't correct
56 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 2 ms 4956 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 3 ms 5172 KB Output is correct
8 Correct 3 ms 4956 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 4956 KB Output is correct
11 Correct 3 ms 4956 KB Output is correct
12 Correct 4 ms 4952 KB Output is correct
13 Correct 3 ms 4956 KB Output is correct
14 Correct 3 ms 4952 KB Output is correct
15 Correct 3 ms 4956 KB Output is correct
16 Correct 3 ms 4956 KB Output is correct
17 Correct 3 ms 5196 KB Output is correct
18 Correct 4 ms 4956 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4952 KB Output is correct
21 Correct 2 ms 5168 KB Output is correct
22 Correct 3 ms 4956 KB Output is correct
23 Correct 3 ms 4956 KB Output is correct
24 Correct 2 ms 4956 KB Output is correct
25 Correct 3 ms 4956 KB Output is correct
26 Correct 2 ms 4956 KB Output is correct
27 Correct 3 ms 4956 KB Output is correct
28 Correct 3 ms 5176 KB Output is correct
29 Correct 95 ms 5464 KB Output is correct
30 Correct 66 ms 5208 KB Output is correct
31 Correct 48 ms 5208 KB Output is correct
32 Correct 27 ms 5212 KB Output is correct
33 Correct 18 ms 5324 KB Output is correct
34 Correct 53 ms 5320 KB Output is correct
35 Correct 70 ms 5208 KB Output is correct
36 Correct 37 ms 5208 KB Output is correct
37 Correct 91 ms 5212 KB Output is correct
38 Correct 77 ms 5328 KB Output is correct
39 Correct 72 ms 5308 KB Output is correct
40 Correct 41 ms 5208 KB Output is correct
41 Correct 38 ms 5208 KB Output is correct
42 Correct 37 ms 5208 KB Output is correct
43 Correct 18 ms 5208 KB Output is correct
44 Correct 21 ms 5208 KB Output is correct
45 Correct 25 ms 5212 KB Output is correct
46 Correct 30 ms 5212 KB Output is correct
47 Correct 33 ms 5212 KB Output is correct
48 Correct 37 ms 5212 KB Output is correct
49 Correct 54 ms 5208 KB Output is correct
50 Correct 68 ms 5212 KB Output is correct
51 Correct 27 ms 5212 KB Output is correct
52 Correct 35 ms 5208 KB Output is correct
53 Correct 47 ms 5324 KB Output is correct
54 Correct 67 ms 5212 KB Output is correct
55 Correct 74 ms 19668 KB Output is correct
56 Correct 70 ms 21840 KB Output is correct
57 Correct 76 ms 21584 KB Output is correct
58 Correct 70 ms 19796 KB Output is correct
59 Correct 74 ms 19796 KB Output is correct
60 Correct 68 ms 18516 KB Output is correct
61 Correct 80 ms 19536 KB Output is correct
62 Correct 75 ms 22056 KB Output is correct
63 Correct 71 ms 19792 KB Output is correct
64 Correct 71 ms 21604 KB Output is correct
65 Correct 70 ms 17876 KB Output is correct
66 Correct 76 ms 18772 KB Output is correct
67 Correct 74 ms 20556 KB Output is correct
68 Correct 74 ms 22132 KB Output is correct
69 Incorrect 76 ms 19760 KB Output isn't correct
70 Halted 0 ms 0 KB -