oj.uz

Submission #919355

# Submission time Handle Problem Language Result Execution time Memory
919355 2024-01-31T16:11:07 Z imarn Mergers (JOI19_mergers) C++14
48 / 100
 848 ms 90644 KB 
#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define vi vector<int>
#define vvi vector<vi>
#define vp vector<pii>
using namespace std;
const int N=5e5+5;
vector<int>g[N];
set<int>gg[N];
int sz[N],id[N],pr[N],head[N],dep[N],cur=0,t[4*N],lz[4*N],pos[N],cp=1,n;
void push(int i,int l,int r){
    if(lz[i]==1e9)return;
    t[i]=min(t[i],lz[i]);
    if(l<r){
        lz[2*i]=min(lz[2*i],lz[i]);
        lz[2*i+1]=min(lz[2*i+1],lz[i]);
    }lz[i]=1e9;
}
void upd(int i,int l,int r,int tl,int tr,int id){
    push(i,l,r);
    if(r<tl||l>tr)return;
    if(r<=tr&&l>=tl){
        lz[i]=min(lz[i],id);push(i,l,r);
        return;
    }int m=(l+r)>>1;
    upd(2*i,l,m,tl,tr,id);upd(2*i+1,m+1,r,tl,tr,id);
    t[i]=min(t[2*i],t[2*i+1]);
}
int qr(int i,int l,int r,int tl,int tr){
    push(i,l,r);
    if(r<tl||l>tr)return 1e9;
    if(r<=tr&&l>=tl)return t[i];
    int m=(l+r)>>1;
    return min(qr(2*i,l,m,tl,tr),qr(2*i+1,m+1,r,tl,tr));
}
void update(int x,int y,int z){
    while(head[x]!=head[y]){
        if(dep[head[x]]<dep[head[y]])swap(x,y);
        upd(1,1,n,id[head[x]],id[x],z);
        x=pr[head[x]];
    }if(dep[x]>dep[y])swap(x,y);
    upd(1,1,n,id[x],id[y],z);
}
int query(int x,int y,int res=1e9){
    while(head[x]!=head[y]){
        if(dep[head[x]]<dep[head[y]])swap(x,y);
        res=min(qr(1,1,n,id[head[x]],id[x]),res);
        x=pr[head[x]];
    }if(dep[x]>dep[y])swap(x,y);
    res=min(res,qr(1,1,n,id[x],id[y]));return res;
}
void dfssz(int u,int p,int l){
    sz[u]=1;dep[u]=l;pr[u]=p;
    for(auto v:g[u]){
        if(v==p)continue;dfssz(v,u,l+1);
        sz[u]+=sz[v];
    }
}
void hld(int u,int p,int tp){
    head[u]=tp;id[u]=++cur;
    int hc=-1,hv=-1;
    for(auto v:g[u]){
        if(v==p)continue;
        if(sz[v]>hc)hv=v,hc=sz[v];
    }if(hv==-1)return;
    hld(hv,u,tp);
    for(auto v:g[u]){
        if(v==p||v==hv)continue;
        hld(v,u,v);
    }
}vector<int>gr[N];
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int k;cin>>n>>k;
    for(int i=0;i<4*N;i++)t[i]=lz[i]=1e9;
    for(int i=1;i<=n-1;i++){
        int u,v;cin>>u>>v;g[u].pb(v);g[v].pb(u);
    }dfssz(1,1,0);hld(1,1,1);bool ok=1;
    for(int i=1,x;i<=n;i++)cin>>x,gr[x].pb(i);
    for(int i=1;i<=k;i++){
        if(gr[i].empty())continue;
        int top=gr[i][0];int res=cp;
        for(int j=0;j<gr[i].size();j++)res=min(res,query(top,gr[i][j]));
        for(int j=0;j<gr[i].size();j++)update(top,gr[i][j],res);
        cp++;
    }
    for(int i=1;i<=k;i++){
        if(gr[i].empty())continue;
        int top=gr[i][0];int res=1e9;
        for(int j=0;j<gr[i].size();j++)res=min(res,query(top,gr[i][j]));
        for(int j=0;j<gr[i].size();j++)update(top,gr[i][j],res);
    }
    for(int i=1;i<=n;i++)pos[i]=qr(1,1,n,id[i],id[i]);
    for(int i=1;i<=n;i++){
        for(auto v:g[i]){
            if(pos[v]==pos[i])continue;
            gg[pos[v]].insert(pos[i]);
            gg[pos[i]].insert(pos[v]);
        }
    }int ct=0;
    for(int i=1;i<=n;i++){
        if(gg[i].empty())continue;
        if(gg[i].size()==1)ct++;
    }cout<<(ct+1)/2;
}

Compilation message

mergers.cpp: In function 'void dfssz(int, int, int)':
mergers.cpp:61:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   61 |         if(v==p)continue;dfssz(v,u,l+1);
      |         ^~
mergers.cpp:61:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   61 |         if(v==p)continue;dfssz(v,u,l+1);
      |                          ^~~~~
mergers.cpp: In function 'int main()':
mergers.cpp:89:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |         for(int j=0;j<gr[i].size();j++)res=min(res,query(top,gr[i][j]));
      |                     ~^~~~~~~~~~~~~
mergers.cpp:90:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |         for(int j=0;j<gr[i].size();j++)update(top,gr[i][j],res);
      |                     ~^~~~~~~~~~~~~
mergers.cpp:96:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |         for(int j=0;j<gr[i].size();j++)res=min(res,query(top,gr[i][j]));
      |                     ~^~~~~~~~~~~~~
mergers.cpp:97:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |         for(int j=0;j<gr[i].size();j++)update(top,gr[i][j],res);
      |                     ~^~~~~~~~~~~~~
mergers.cpp:84:35: warning: unused variable 'ok' [-Wunused-variable]
   84 |     }dfssz(1,1,0);hld(1,1,1);bool ok=1;
      |                                   ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 74584 KB Output is correct
2 Correct 20 ms 74584 KB Output is correct
3 Correct 19 ms 74584 KB Output is correct
4 Correct 20 ms 74584 KB Output is correct
5 Correct 19 ms 75056 KB Output is correct
6 Correct 19 ms 74840 KB Output is correct
7 Correct 19 ms 74584 KB Output is correct
8 Correct 21 ms 74584 KB Output is correct
9 Correct 19 ms 74588 KB Output is correct
10 Correct 19 ms 74584 KB Output is correct
11 Correct 20 ms 74588 KB Output is correct
12 Correct 18 ms 74584 KB Output is correct
13 Correct 19 ms 74584 KB Output is correct
14 Correct 19 ms 74584 KB Output is correct
15 Correct 19 ms 74800 KB Output is correct
16 Correct 19 ms 74584 KB Output is correct
17 Correct 20 ms 74584 KB Output is correct
18 Correct 19 ms 74584 KB Output is correct
19 Correct 19 ms 74584 KB Output is correct
20 Correct 22 ms 74792 KB Output is correct
21 Correct 19 ms 74584 KB Output is correct
22 Correct 21 ms 74584 KB Output is correct
23 Correct 19 ms 74584 KB Output is correct
24 Correct 18 ms 74588 KB Output is correct

Subtask #2
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 74584 KB Output is correct
2 Correct 20 ms 74584 KB Output is correct
3 Correct 19 ms 74584 KB Output is correct
4 Correct 20 ms 74584 KB Output is correct
5 Correct 19 ms 75056 KB Output is correct
6 Correct 19 ms 74840 KB Output is correct
7 Correct 19 ms 74584 KB Output is correct
8 Correct 21 ms 74584 KB Output is correct
9 Correct 19 ms 74588 KB Output is correct
10 Correct 19 ms 74584 KB Output is correct
11 Correct 20 ms 74588 KB Output is correct
12 Correct 18 ms 74584 KB Output is correct
13 Correct 19 ms 74584 KB Output is correct
14 Correct 19 ms 74584 KB Output is correct
15 Correct 19 ms 74800 KB Output is correct
16 Correct 19 ms 74584 KB Output is correct
17 Correct 20 ms 74584 KB Output is correct
18 Correct 19 ms 74584 KB Output is correct
19 Correct 19 ms 74584 KB Output is correct
20 Correct 22 ms 74792 KB Output is correct
21 Correct 19 ms 74584 KB Output is correct
22 Correct 21 ms 74584 KB Output is correct
23 Correct 19 ms 74584 KB Output is correct
24 Correct 18 ms 74588 KB Output is correct
25 Correct 18 ms 74840 KB Output is correct
26 Correct 23 ms 75096 KB Output is correct
27 Correct 25 ms 75096 KB Output is correct
28 Correct 23 ms 75096 KB Output is correct
29 Correct 24 ms 75272 KB Output is correct
30 Correct 32 ms 74840 KB Output is correct
31 Correct 21 ms 74824 KB Output is correct
32 Correct 22 ms 75096 KB Output is correct
33 Correct 22 ms 74584 KB Output is correct
34 Correct 24 ms 74840 KB Output is correct
35 Correct 23 ms 75264 KB Output is correct
36 Correct 25 ms 74840 KB Output is correct
37 Correct 27 ms 74840 KB Output is correct
38 Correct 20 ms 74584 KB Output is correct
39 Correct 29 ms 74804 KB Output is correct
40 Correct 28 ms 74792 KB Output is correct
41 Correct 29 ms 74800 KB Output is correct
42 Correct 27 ms 74840 KB Output is correct
43 Correct 24 ms 75068 KB Output is correct
44 Correct 20 ms 74584 KB Output is correct
45 Correct 23 ms 75096 KB Output is correct
46 Correct 26 ms 74840 KB Output is correct
47 Correct 20 ms 74828 KB Output is correct
48 Correct 27 ms 74840 KB Output is correct
49 Correct 24 ms 75220 KB Output is correct
50 Correct 24 ms 75296 KB Output is correct
51 Correct 26 ms 74844 KB Output is correct
52 Correct 24 ms 74840 KB Output is correct
53 Correct 26 ms 74840 KB Output is correct
54 Correct 32 ms 74836 KB Output is correct

Subtask #3
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 74584 KB Output is correct
2 Correct 20 ms 74584 KB Output is correct
3 Correct 19 ms 74584 KB Output is correct
4 Correct 20 ms 74584 KB Output is correct
5 Correct 19 ms 75056 KB Output is correct
6 Correct 19 ms 74840 KB Output is correct
7 Correct 19 ms 74584 KB Output is correct
8 Correct 21 ms 74584 KB Output is correct
9 Correct 19 ms 74588 KB Output is correct
10 Correct 19 ms 74584 KB Output is correct
11 Correct 20 ms 74588 KB Output is correct
12 Correct 18 ms 74584 KB Output is correct
13 Correct 19 ms 74584 KB Output is correct
14 Correct 19 ms 74584 KB Output is correct
15 Correct 19 ms 74800 KB Output is correct
16 Correct 19 ms 74584 KB Output is correct
17 Correct 20 ms 74584 KB Output is correct
18 Correct 19 ms 74584 KB Output is correct
19 Correct 19 ms 74584 KB Output is correct
20 Correct 22 ms 74792 KB Output is correct
21 Correct 19 ms 74584 KB Output is correct
22 Correct 21 ms 74584 KB Output is correct
23 Correct 19 ms 74584 KB Output is correct
24 Correct 18 ms 74588 KB Output is correct
25 Correct 20 ms 74784 KB Output is correct
26 Correct 313 ms 78844 KB Output is correct
27 Correct 821 ms 78524 KB Output is correct
28 Correct 25 ms 74948 KB Output is correct
29 Correct 19 ms 74840 KB Output is correct
30 Correct 20 ms 74588 KB Output is correct
31 Correct 571 ms 78536 KB Output is correct
32 Correct 30 ms 74788 KB Output is correct
33 Correct 309 ms 85840 KB Output is correct
34 Correct 848 ms 78620 KB Output is correct
35 Correct 25 ms 74840 KB Output is correct
36 Correct 297 ms 79264 KB Output is correct
37 Correct 30 ms 74844 KB Output is correct
38 Correct 29 ms 75096 KB Output is correct
39 Correct 339 ms 78880 KB Output is correct
40 Correct 23 ms 75096 KB Output is correct
41 Correct 570 ms 78676 KB Output is correct
42 Correct 339 ms 80916 KB Output is correct
43 Correct 20 ms 74824 KB Output is correct
44 Correct 219 ms 86144 KB Output is correct
45 Correct 391 ms 82312 KB Output is correct
46 Correct 31 ms 74832 KB Output is correct
47 Correct 34 ms 74840 KB Output is correct

Subtask #4
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 327 ms 78920 KB Output is correct
2 Correct 303 ms 90644 KB Output is correct
3 Correct 28 ms 75096 KB Output is correct
4 Correct 24 ms 74840 KB Output is correct
5 Correct 20 ms 74584 KB Output is correct
6 Correct 19 ms 74832 KB Output is correct
7 Correct 29 ms 74840 KB Output is correct
8 Incorrect 319 ms 80392 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 74584 KB Output is correct
2 Correct 20 ms 74584 KB Output is correct
3 Correct 19 ms 74584 KB Output is correct
4 Correct 20 ms 74584 KB Output is correct
5 Correct 19 ms 75056 KB Output is correct
6 Correct 19 ms 74840 KB Output is correct
7 Correct 19 ms 74584 KB Output is correct
8 Correct 21 ms 74584 KB Output is correct
9 Correct 19 ms 74588 KB Output is correct
10 Correct 19 ms 74584 KB Output is correct
11 Correct 20 ms 74588 KB Output is correct
12 Correct 18 ms 74584 KB Output is correct
13 Correct 19 ms 74584 KB Output is correct
14 Correct 19 ms 74584 KB Output is correct
15 Correct 19 ms 74800 KB Output is correct
16 Correct 19 ms 74584 KB Output is correct
17 Correct 20 ms 74584 KB Output is correct
18 Correct 19 ms 74584 KB Output is correct
19 Correct 19 ms 74584 KB Output is correct
20 Correct 22 ms 74792 KB Output is correct
21 Correct 19 ms 74584 KB Output is correct
22 Correct 21 ms 74584 KB Output is correct
23 Correct 19 ms 74584 KB Output is correct
24 Correct 18 ms 74588 KB Output is correct
25 Correct 18 ms 74840 KB Output is correct
26 Correct 23 ms 75096 KB Output is correct
27 Correct 25 ms 75096 KB Output is correct
28 Correct 23 ms 75096 KB Output is correct
29 Correct 24 ms 75272 KB Output is correct
30 Correct 32 ms 74840 KB Output is correct
31 Correct 21 ms 74824 KB Output is correct
32 Correct 22 ms 75096 KB Output is correct
33 Correct 22 ms 74584 KB Output is correct
34 Correct 24 ms 74840 KB Output is correct
35 Correct 23 ms 75264 KB Output is correct
36 Correct 25 ms 74840 KB Output is correct
37 Correct 27 ms 74840 KB Output is correct
38 Correct 20 ms 74584 KB Output is correct
39 Correct 29 ms 74804 KB Output is correct
40 Correct 28 ms 74792 KB Output is correct
41 Correct 29 ms 74800 KB Output is correct
42 Correct 27 ms 74840 KB Output is correct
43 Correct 24 ms 75068 KB Output is correct
44 Correct 20 ms 74584 KB Output is correct
45 Correct 23 ms 75096 KB Output is correct
46 Correct 26 ms 74840 KB Output is correct
47 Correct 20 ms 74828 KB Output is correct
48 Correct 27 ms 74840 KB Output is correct
49 Correct 24 ms 75220 KB Output is correct
50 Correct 24 ms 75296 KB Output is correct
51 Correct 26 ms 74844 KB Output is correct
52 Correct 24 ms 74840 KB Output is correct
53 Correct 26 ms 74840 KB Output is correct
54 Correct 32 ms 74836 KB Output is correct
55 Correct 20 ms 74784 KB Output is correct
56 Correct 313 ms 78844 KB Output is correct
57 Correct 821 ms 78524 KB Output is correct
58 Correct 25 ms 74948 KB Output is correct
59 Correct 19 ms 74840 KB Output is correct
60 Correct 20 ms 74588 KB Output is correct
61 Correct 571 ms 78536 KB Output is correct
62 Correct 30 ms 74788 KB Output is correct
63 Correct 309 ms 85840 KB Output is correct
64 Correct 848 ms 78620 KB Output is correct
65 Correct 25 ms 74840 KB Output is correct
66 Correct 297 ms 79264 KB Output is correct
67 Correct 30 ms 74844 KB Output is correct
68 Correct 29 ms 75096 KB Output is correct
69 Correct 339 ms 78880 KB Output is correct
70 Correct 23 ms 75096 KB Output is correct
71 Correct 570 ms 78676 KB Output is correct
72 Correct 339 ms 80916 KB Output is correct
73 Correct 20 ms 74824 KB Output is correct
74 Correct 219 ms 86144 KB Output is correct
75 Correct 391 ms 82312 KB Output is correct
76 Correct 31 ms 74832 KB Output is correct
77 Correct 34 ms 74840 KB Output is correct
78 Correct 327 ms 78920 KB Output is correct
79 Correct 303 ms 90644 KB Output is correct
80 Correct 28 ms 75096 KB Output is correct
81 Correct 24 ms 74840 KB Output is correct
82 Correct 20 ms 74584 KB Output is correct
83 Correct 19 ms 74832 KB Output is correct
84 Correct 29 ms 74840 KB Output is correct
85 Incorrect 319 ms 80392 KB Output isn't correct
86 Halted 0 ms 0 KB -