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Submission #938314

# Submission time Handle Problem Language Result Execution time Memory
938314 2024-03-05T04:32:35 Z UmairAhmadMirza Three Friends (BOI14_friends) C++17
100 / 100
 110 ms 64052 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
int const N=3e6+5;
int const mod=1e9+9;
int const base=727;
int Hash[N];
int pw[N];
int n;
string s;
void pre(){
  pw[0]=1;
  for(int i=1;i<N;i++)
    pw[i]=(pw[i-1]*base)%mod;
}
void make_Hash(){
  for(int i=1;i<=n;i++)
    Hash[i]=(((Hash[i-1]*base)%mod)+s[i-1])%mod;
}
int compute_Hash(int l,int r){
  return ((Hash[r] - ((Hash[l]*pw[r-l])%mod) )+mod)%mod;
}
int org_Hash1(int e){
  if(e>n/2)
    return Hash[n/2];
  int h=(Hash[e-1]*pw[((n/2)+1)-e])%mod;
  h+=compute_Hash(e,(n/2)+1);
  h%=mod;
  return h;
}
int org_Hash2(int e){
  if(e<=(n/2)+1)
    return compute_Hash((n/2)+1,n);
  int h=(compute_Hash((n/2),e-1)*pw[n-e])%mod;
  h+=compute_Hash(e,n);
  h%=mod;
  return h;
}
string make_str(int p){
  string st="";
  int sz=0;
  int i=0;
  while(i<=n && sz<(n/2)){
    i++;
    if(i==p)
      continue;
    st+=s[i-1];
    sz++;
  }
  return st;
}
signed main() 
{
  cin>>n;
  cin>>s;
  if(n%2==0){
    cout<<"NOT POSSIBLE\n";
    return 0;
  }
  pre();
  make_Hash();
  int rem=0;
  vector<int> rm;
  int cnt=0;
  for(int i=1;i<=n;i++){
    if(org_Hash1(i)==org_Hash2(i)){
      rem=i;
      rm.push_back(i);
      cnt++;
    }
  }
  if(cnt==0)
    cout<<"NOT POSSIBLE"<<endl;
  else if(cnt>1 && make_str(rm[0])!=make_str(rm[1]))
    cout<<"NOT UNIQUE"<<endl;
  else
    cout<<make_str(rem)<<endl;
  return 0;
}

Subtask #1
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 25168 KB Output is correct
2 Correct 16 ms 25180 KB Output is correct
3 Correct 16 ms 25212 KB Output is correct
4 Correct 16 ms 25180 KB Output is correct
5 Correct 16 ms 25176 KB Output is correct
6 Correct 16 ms 25180 KB Output is correct
7 Correct 16 ms 25180 KB Output is correct
8 Correct 16 ms 25180 KB Output is correct
9 Correct 16 ms 25200 KB Output is correct
10 Correct 16 ms 25180 KB Output is correct
11 Correct 17 ms 25212 KB Output is correct
12 Correct 17 ms 25176 KB Output is correct
13 Correct 16 ms 25180 KB Output is correct
14 Correct 17 ms 25172 KB Output is correct
15 Correct 16 ms 25176 KB Output is correct
16 Correct 16 ms 25180 KB Output is correct
17 Correct 16 ms 25176 KB Output is correct
18 Correct 16 ms 25180 KB Output is correct
19 Correct 16 ms 25180 KB Output is correct
20 Correct 17 ms 25180 KB Output is correct
21 Correct 16 ms 25180 KB Output is correct
22 Correct 17 ms 25420 KB Output is correct
23 Correct 17 ms 25180 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 16 ms 25180 KB Output is correct
28 Correct 17 ms 25204 KB Output is correct
29 Correct 17 ms 25180 KB Output is correct
30 Correct 16 ms 25180 KB Output is correct
31 Correct 17 ms 25212 KB Output is correct
32 Correct 16 ms 25228 KB Output is correct
33 Correct 16 ms 25180 KB Output is correct
34 Correct 16 ms 25180 KB Output is correct
35 Correct 17 ms 25180 KB Output is correct
36 Correct 16 ms 25176 KB Output is correct
37 Correct 16 ms 25180 KB Output is correct
38 Correct 16 ms 25196 KB Output is correct
39 Correct 16 ms 25180 KB Output is correct
40 Correct 16 ms 25180 KB Output is correct
41 Correct 16 ms 25180 KB Output is correct
42 Correct 16 ms 25212 KB Output is correct
43 Correct 16 ms 25180 KB Output is correct
44 Correct 17 ms 25172 KB Output is correct
45 Correct 16 ms 25220 KB Output is correct
46 Correct 16 ms 25180 KB Output is correct
47 Correct 17 ms 25224 KB Output is correct
48 Correct 16 ms 25232 KB Output is correct
49 Correct 0 ms 348 KB Output is correct
50 Correct 16 ms 25272 KB Output is correct
51 Correct 16 ms 25180 KB Output is correct
52 Correct 16 ms 25180 KB Output is correct
53 Correct 17 ms 25180 KB Output is correct
54 Correct 17 ms 25180 KB Output is correct

Subtask #2
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 109 ms 47404 KB Output is correct
2 Correct 91 ms 47092 KB Output is correct
3 Correct 90 ms 47184 KB Output is correct
4 Correct 93 ms 47288 KB Output is correct
5 Correct 96 ms 47744 KB Output is correct
6 Correct 29 ms 7240 KB Output is correct
7 Correct 110 ms 64052 KB Output is correct
8 Correct 85 ms 44900 KB Output is correct
9 Correct 86 ms 45068 KB Output is correct
10 Correct 89 ms 45120 KB Output is correct
11 Correct 77 ms 40304 KB Output is correct
12 Correct 17 ms 25176 KB Output is correct
13 Correct 16 ms 25180 KB Output is correct
14 Correct 16 ms 25208 KB Output is correct
15 Correct 16 ms 25180 KB Output is correct
16 Correct 16 ms 25180 KB Output is correct
17 Correct 17 ms 25196 KB Output is correct
18 Correct 16 ms 25180 KB Output is correct
19 Correct 16 ms 25212 KB Output is correct
20 Correct 17 ms 25232 KB Output is correct
21 Correct 16 ms 25180 KB Output is correct
22 Correct 16 ms 25236 KB Output is correct
23 Correct 16 ms 25196 KB Output is correct
24 Correct 16 ms 25176 KB Output is correct
25 Correct 17 ms 25176 KB Output is correct
26 Correct 16 ms 25180 KB Output is correct
27 Correct 16 ms 25180 KB Output is correct
28 Correct 16 ms 25212 KB Output is correct
29 Correct 16 ms 25180 KB Output is correct
30 Correct 16 ms 25180 KB Output is correct
31 Correct 16 ms 25176 KB Output is correct
32 Correct 17 ms 25180 KB Output is correct
33 Correct 16 ms 25212 KB Output is correct
34 Correct 17 ms 25176 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 0 ms 440 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 16 ms 25216 KB Output is correct
39 Correct 17 ms 25180 KB Output is correct
40 Correct 16 ms 25180 KB Output is correct
41 Correct 17 ms 25012 KB Output is correct
42 Correct 16 ms 25180 KB Output is correct
43 Correct 16 ms 25176 KB Output is correct
44 Correct 16 ms 25180 KB Output is correct
45 Correct 16 ms 25180 KB Output is correct
46 Correct 16 ms 25180 KB Output is correct
47 Correct 16 ms 25180 KB Output is correct
48 Correct 16 ms 25180 KB Output is correct
49 Correct 16 ms 25228 KB Output is correct
50 Correct 20 ms 25176 KB Output is correct
51 Correct 17 ms 25220 KB Output is correct
52 Correct 17 ms 25180 KB Output is correct
53 Correct 16 ms 25180 KB Output is correct
54 Correct 16 ms 25020 KB Output is correct