oj.uz

Submission #1102114

# Submission time Handle Problem Language Result Execution time Memory
1102114 2024-10-17T13:36:46 Z epicci23 Inside information (BOI21_servers) C++17
50 / 100
 298 ms 60744 KB 
#include "bits/stdc++.h"
//#define int long long
#define all(v) v.begin() , v.end()
#define sz(a) (int)a.size()
using namespace std;

const int N = 1e5 + 4e4 + 5;
const int LOG = 20;
const int INF = 1e9;

int maxi[N][LOG],mini[N][LOG];
int lift[N][LOG],depth[N],ans[N],vis[N],sub[N],comp=0;
vector<array<int,2>> v[N],tag[N];

void dfs(int c){
  for(int i=1;i<LOG;i++) lift[c][i]=lift[lift[c][i-1]][i-1];
  
  for(int i=1;i<LOG;i++){
  	int u = maxi[c][i-1];
  	int u2 = maxi[lift[c][i-1]][i-1];
  	if(u==-1 || u2==-1) continue;
  	if(u>maxi[lift[c][i-1]][0]) continue;
    maxi[c][i]=u2;
  }

  for(int i=1;i<LOG;i++){
  	int u = mini[c][i-1];
  	int u2 = mini[lift[c][i-1]][i-1];
  	if(u==-1 || u2==-1) continue;
  	if(u<mini[lift[c][i-1]][0]) continue;
    mini[c][i]=u2;
  }

  for(auto E:v[c]){
   int x=E[0],y=E[1];
   if(x==lift[c][0]) continue;
   depth[x]=depth[c]+1;
   lift[x][0]=c;
   maxi[x][0]=mini[x][0]=y;
   dfs(x);
  }
}

inline int lca(int a,int b){
  if(depth[a]<depth[b]) swap(a,b);
  for(int i=0;i<LOG;i++) if((depth[a]-depth[b])>>i&1) a=lift[a][i];
  if(a==b) return a;
  for(int i=LOG-1;i>=0;i--){
  	if(lift[a][i]!=lift[b][i]){
  	  a=lift[a][i];
  	  b=lift[b][i];
  	}
  }
  return lift[a][0];
}

inline int yukari(int a,int u){
  int le = depth[a]-depth[u],lol = 0;
  for(int i=LOG-1;i>=0;i--){
    if(!(le>>i&1)) continue;
    if(maxi[a][i]==-1) return -1;
    if(lol>maxi[a][0]) return -1;
    lol=maxi[a][i];
    a=lift[a][i];
  }
  return lol;
}

inline int asagi(int a,int u){
  int le = depth[a]-depth[u],lol = INF;
  for(int i=LOG-1;i>=0;i--){
    if(!(le>>i&1)) continue;
    if(mini[a][i]==-1) return -1;
    if(lol<mini[a][0]) return -1;
    lol=mini[a][i];
    a=lift[a][i];
  }
  return lol;
}

inline int check(int a,int b){
  if(a==b) return 0;
  int c=lca(a,b);
  int hm = yukari(a,c);
  int hm2 = asagi(b,c);
  if(hm==-1 || hm2==-1 || hm>hm2) return -1;
  int xdd = hm;
  if(b!=c) xdd=max(xdd,maxi[b][0]);
  return xdd;
}

void precalc(int c,int p){
  sub[c]=1;
  comp++;
  for(auto E:v[c]){
    int x = E[0];
    if(x==p || vis[x]) continue;
    precalc(x,c);
    sub[c]+=sub[x];
  }
}

int find_centroid(int c,int p){
  for(auto E:v[c]){
    int x = E[0];
    if(x==p || vis[x]) continue;
    if(sub[x]>comp/2) return find_centroid(x,c);
  }
  return c;
}

int fw[N];

inline void Upd(int c,int u){
  for(;c<N;c+=c&-c) fw[c]+=u;    
}

inline int Query(int c,int res=0){
  for(;c;c-=c&-c) res+=fw[c];
  return res;
}

void Add(int c,int p,int last,int val){
  Upd(last,val);
  for(auto E:v[c]){
    int x=E[0],u=E[1];
    if(vis[x] || x==p || last>u) continue;
    Add(x,c,u,val);
  }
}

void Get(int c,int p,int bruh,int azal){
  for(auto x:tag[c]){
    if(bruh>x[1]) continue;
    ans[x[1]]+=Query(x[0])+1;
  }
  for(auto E:v[c]){
    int x=E[0],u=E[1];
    if(vis[x] || x==p || azal<u) continue;
    Get(x,c,bruh,u);
  }
}

void centroid(int c,int p){
  comp=0;precalc(c,p);
  c=find_centroid(c,p);
  sort(all(v[c]),[&](array<int,2> a,array<int,2> b){
    return a[1]>b[1];
  });
  for(auto E:v[c]){
    int x = E[0], u = E[1];
    if(x==p || vis[x]) continue;
    Get(x,c,u,u);
    Add(x,c,u,1);
  }
  for(auto x:tag[c]) ans[x[1]]+=Query(x[0]);
  for(auto E:v[c]){
    int x = E[0], u = E[1];
    if(x==p || vis[x]) continue;
    Add(x,c,u,-1);
  }
  vis[c]=1;
  for(auto E:v[c]){
    int x = E[0], u = E[1];
    if(x==p || vis[x]) continue;
    centroid(x,c);
  }
}

void _(){
  memset(maxi,-1,sizeof(maxi));
  memset(mini,-1,sizeof(mini));

  int n,q;
  cin >> n >> q;
  
  vector<array<int,4>> cevapla;
  int cp=0,ed=0;

  for(int i=1;i<n+q;i++){
    char op;
    cin >> op;
    if(op=='S'){
     int a,b;
     cin >> a >> b;
     ++ed;
     v[a].push_back({b,ed});
     v[b].push_back({a,ed});
    }
    else if(op=='Q'){
      int a,b;
      cin >> a >> b;
      cevapla.push_back({b,a,ed,++cp});
    }
    else{
      int a;
      cin >> a;
      tag[a].push_back({ed,++cp});
    }
  }
  dfs(1);
  for(auto x:cevapla){
    int res = check(x[0],x[1]);
    if(res==-1 || res>x[2]) ans[x[3]]=-2;
    else ans[x[3]]=-1; 
  }
  centroid(1,1);
  for(int i=1;i<=cp;i++){
    if(ans[i]==-2) cout << "no\n";
    else if(ans[i]==-1) cout << "yes\n";
    else cout << ans[i] + 1 << '\n';
  }
}

int32_t main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tc=1;//cin >> tc;
  while(tc--) _();
  return 0;
}

Compilation message

servers.cpp: In function 'void centroid(int, int)':
servers.cpp:164:19: warning: unused variable 'u' [-Wunused-variable]
  164 |     int x = E[0], u = E[1];
      |                   ^

Subtask #1
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 44 ms 31680 KB Output is correct
2 Correct 49 ms 32212 KB Output is correct
3 Correct 48 ms 33568 KB Output is correct
4 Correct 58 ms 32320 KB Output is correct
5 Correct 57 ms 32472 KB Output is correct
6 Correct 52 ms 33092 KB Output is correct

Subtask #2
0 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 44 ms 31680 KB Output is correct
2 Correct 49 ms 32212 KB Output is correct
3 Correct 48 ms 33568 KB Output is correct
4 Correct 58 ms 32320 KB Output is correct
5 Correct 57 ms 32472 KB Output is correct
6 Correct 52 ms 33092 KB Output is correct
7 Incorrect 41 ms 31680 KB Extra information in the output file
8 Halted 0 ms 0 KB -

Subtask #3
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 40 ms 31656 KB Output is correct
2 Correct 154 ms 47636 KB Output is correct
3 Correct 145 ms 49372 KB Output is correct

Subtask #4
0 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 40 ms 31656 KB Output is correct
2 Correct 154 ms 47636 KB Output is correct
3 Correct 145 ms 49372 KB Output is correct
4 Incorrect 45 ms 31680 KB Extra information in the output file
5 Halted 0 ms 0 KB -

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 31680 KB Output is correct
2 Correct 188 ms 58020 KB Output is correct
3 Correct 188 ms 57948 KB Output is correct
4 Correct 188 ms 58040 KB Output is correct

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 31680 KB Output is correct
2 Correct 188 ms 58020 KB Output is correct
3 Correct 188 ms 57948 KB Output is correct
4 Correct 188 ms 58040 KB Output is correct
5 Incorrect 39 ms 32332 KB Extra information in the output file
6 Halted 0 ms 0 KB -

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 42 ms 32448 KB Output is correct
2 Correct 125 ms 47156 KB Output is correct
3 Correct 131 ms 47800 KB Output is correct

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 42 ms 32448 KB Output is correct
2 Correct 125 ms 47156 KB Output is correct
3 Correct 131 ms 47800 KB Output is correct
4 Incorrect 42 ms 32456 KB Extra information in the output file
5 Halted 0 ms 0 KB -

Subtask #9
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 38 ms 31688 KB Output is correct
2 Correct 186 ms 58040 KB Output is correct
3 Correct 195 ms 60744 KB Output is correct
4 Correct 199 ms 58040 KB Output is correct
5 Correct 49 ms 32704 KB Output is correct
6 Correct 130 ms 47272 KB Output is correct
7 Correct 149 ms 49696 KB Output is correct
8 Correct 195 ms 51368 KB Output is correct
9 Correct 198 ms 51384 KB Output is correct
10 Correct 252 ms 55736 KB Output is correct
11 Correct 298 ms 54568 KB Output is correct

Subtask #10
0 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 38 ms 31688 KB Output is correct
2 Correct 186 ms 58040 KB Output is correct
3 Correct 195 ms 60744 KB Output is correct
4 Correct 199 ms 58040 KB Output is correct
5 Correct 49 ms 32704 KB Output is correct
6 Correct 130 ms 47272 KB Output is correct
7 Correct 149 ms 49696 KB Output is correct
8 Correct 195 ms 51368 KB Output is correct
9 Correct 198 ms 51384 KB Output is correct
10 Correct 252 ms 55736 KB Output is correct
11 Correct 298 ms 54568 KB Output is correct
12 Incorrect 42 ms 31688 KB Extra information in the output file
13 Halted 0 ms 0 KB -

Subtask #11
17.5 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 47 ms 32012 KB Output is correct
2 Correct 64 ms 33248 KB Output is correct
3 Correct 47 ms 32204 KB Output is correct
4 Correct 62 ms 33204 KB Output is correct
5 Correct 55 ms 32440 KB Output is correct
6 Correct 58 ms 33300 KB Output is correct
7 Correct 45 ms 31680 KB Output is correct
8 Correct 160 ms 47796 KB Output is correct
9 Correct 158 ms 47792 KB Output is correct
10 Correct 44 ms 31688 KB Output is correct
11 Correct 212 ms 57932 KB Output is correct
12 Correct 221 ms 59700 KB Output is correct
13 Correct 188 ms 59832 KB Output is correct
14 Correct 42 ms 32704 KB Output is correct
15 Correct 116 ms 47288 KB Output is correct
16 Correct 138 ms 50716 KB Output is correct
17 Correct 183 ms 50492 KB Output is correct
18 Correct 173 ms 50276 KB Output is correct
19 Correct 235 ms 56760 KB Output is correct
20 Correct 268 ms 54628 KB Output is correct
21 Correct 143 ms 49592 KB Output is correct
22 Correct 142 ms 49840 KB Output is correct
23 Correct 167 ms 50872 KB Output is correct
24 Correct 161 ms 50872 KB Output is correct
25 Correct 222 ms 53688 KB Output is correct
26 Correct 206 ms 49592 KB Output is correct
27 Correct 188 ms 49596 KB Output is correct

Subtask #12
0 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 47 ms 32012 KB Output is correct
2 Correct 64 ms 33248 KB Output is correct
3 Correct 47 ms 32204 KB Output is correct
4 Correct 62 ms 33204 KB Output is correct
5 Correct 55 ms 32440 KB Output is correct
6 Correct 58 ms 33300 KB Output is correct
7 Correct 45 ms 31680 KB Output is correct
8 Correct 160 ms 47796 KB Output is correct
9 Correct 158 ms 47792 KB Output is correct
10 Correct 44 ms 31688 KB Output is correct
11 Correct 212 ms 57932 KB Output is correct
12 Correct 221 ms 59700 KB Output is correct
13 Correct 188 ms 59832 KB Output is correct
14 Correct 42 ms 32704 KB Output is correct
15 Correct 116 ms 47288 KB Output is correct
16 Correct 138 ms 50716 KB Output is correct
17 Correct 183 ms 50492 KB Output is correct
18 Correct 173 ms 50276 KB Output is correct
19 Correct 235 ms 56760 KB Output is correct
20 Correct 268 ms 54628 KB Output is correct
21 Correct 143 ms 49592 KB Output is correct
22 Correct 142 ms 49840 KB Output is correct
23 Correct 167 ms 50872 KB Output is correct
24 Correct 161 ms 50872 KB Output is correct
25 Correct 222 ms 53688 KB Output is correct
26 Correct 206 ms 49592 KB Output is correct
27 Correct 188 ms 49596 KB Output is correct
28 Incorrect 45 ms 31680 KB Extra information in the output file
29 Halted 0 ms 0 KB -