oj.uz

Submission #643519

# Submission time Handle Problem Language Result Execution time Memory
643519 2022-09-22T09:22:17 Z mychecksedad Palindromi (COCI22_palindromi) C++17
30 / 110
 79 ms 95436 KB 
/* Author : Mychecksdead */
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;

ll e[N], re[N], h[N], rh[N];
ll po(ll a, ll b){ll res = 1; while(b){if(b&1) (res*=a)%=MOD; b>>=1; (a*=a)%=MOD;} return res;}
struct Dsu {
    vector<int> s, p;
    vector<deque<char>> str;
    vector<ll> ans;
    vector<set<int>> hashes, hashes1;
    Dsu(int n, string ss){
        s.resize(n+1, 1);
        p.resize(n+1);
        hashes.resize(n+1);
        hashes1.resize(n+1);
        ans.resize(n+1, 1);
        for(int i = 0; i <= n; ++i) p[i] = i;
        str.pb({'c'});
        for(int i = 0; i < n; ++i) str.pb({ss[i]}), hashes1[i + 1].insert((ss[i] - '0' + 1) * e[1]);
    }
    int find(int v){
        if(p[v] == v) return v;
        return (p[v] = find(p[v]));
    }
    ll merge(int a, int b){
        a = find(a);
        b = find(b);
        if(a != b){
            int f = s[a];
            if(s[a] > s[b]){
                for(char c: str[b]) str[a].pb(c);
                for(int x: hashes[b]) hashes[a].insert(x);
                for(int x: hashes1[b]) hashes1[a].insert(x);
                swap(a, b);
            }else{
                for(int c = str[a].size() - 1; c >= 0; --c) str[b].push_front(str[a][c]);
                for(int x: hashes[a]) hashes[b].insert(x);
                for(int x: hashes1[a]) hashes1[b].insert(x);
            }
            s[b] += s[a];
            p[a] = b;
            int x = p[a];
            ans[x] = 0;

            h[0] = 0, rh[s[x] + 1] = 0;
            for(int i = 1; i <= s[x]; ++i) h[i] = (h[i - 1] + e[i] * (str[x][i-1]-'0'+1)) % MOD;
            for(int i = s[x]; i >= 1; --i) rh[i] = (rh[i + 1] + e[s[x] - i + 1] * (str[x][i-1]-'0'+1)) % MOD;

            for(int i = 1; i <= f; ++i){
                // cout << str[x][i - 1];
                for(int j = f + 1; j <= str[x].size(); ++j){
                    int m = (i + j) >> 1;

                    bool ok = 1;

                    int has;

                    if((i - j) & 1){
                        ok = ((h[m] - h[i - 1] + MOD) * re[i - 1] % MOD) == ((rh[m + 1] - rh[j + 1] + MOD) * re[s[x] - j] % MOD);
                        has = ((h[m] - h[i - 1] + MOD) * re[i - 1] % MOD);
                    }else{
                        ok = ((h[m] - h[i - 1] + MOD) * re[i - 1] % MOD) == ((rh[m] - rh[j + 1] + MOD) * re[s[x] - j] % MOD);
                        has = ((h[m] - h[i - 1] + MOD) * re[i - 1] % MOD);
                    }

                    if(ok) if((i-j)&1) hashes[x].insert(has); else hashes1[x].insert(has);
                }
            }
            return ans[x] = hashes[x].size() + hashes1[x].size();
        }
        return -1;
    }
};


int n;
string s;
void solve(){
    cin >> n >> s;

    e[0] = re[0] = 1;
    for(int i = 1; i < N; ++i) e[i] = (e[i - 1] * 31) % MOD;
    re[N - 1] = po(e[N - 1], MOD - 2);
    for(int i = N - 2; i >= 0; --i) re[i] = (re[i + 1] * 31) % MOD; 
    Dsu d(n, s);
    if(n <= 1000){
        for(int i = 0; i < n - 1; ++i){
            int u, v; cin >> u >> v;
            u = d.find(u);
            v = d.find(v);
            cout << d.merge(u, v) << '\n';
        }
    }


}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message

Main.cpp: In member function 'll Dsu::merge(int, int)':
Main.cpp:62:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |                 for(int j = f + 1; j <= str[x].size(); ++j){
      |                                    ~~^~~~~~~~~~~~~~~~
Main.cpp:77:23: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   77 |                     if(ok) if((i-j)&1) hashes[x].insert(has); else hashes1[x].insert(has);
      |                       ^
Main.cpp: In function 'int main()':
Main.cpp:115:16: warning: unused variable 'aa' [-Wunused-variable]
  115 |     int T = 1, aa;
      |                ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 15888 KB Output is correct
2 Correct 15 ms 15996 KB Output is correct
3 Correct 15 ms 16084 KB Output is correct
4 Correct 16 ms 16092 KB Output is correct
5 Correct 15 ms 15984 KB Output is correct
6 Correct 15 ms 16076 KB Output is correct
7 Correct 15 ms 15956 KB Output is correct
8 Correct 15 ms 15968 KB Output is correct
9 Correct 15 ms 15956 KB Output is correct
10 Correct 14 ms 15956 KB Output is correct
11 Correct 16 ms 15956 KB Output is correct
12 Correct 15 ms 16036 KB Output is correct
13 Correct 15 ms 16084 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 15888 KB Output is correct
2 Correct 15 ms 15996 KB Output is correct
3 Correct 15 ms 16084 KB Output is correct
4 Correct 16 ms 16092 KB Output is correct
5 Correct 15 ms 15984 KB Output is correct
6 Correct 15 ms 16076 KB Output is correct
7 Correct 15 ms 15956 KB Output is correct
8 Correct 15 ms 15968 KB Output is correct
9 Correct 15 ms 15956 KB Output is correct
10 Correct 14 ms 15956 KB Output is correct
11 Correct 16 ms 15956 KB Output is correct
12 Correct 15 ms 16036 KB Output is correct
13 Correct 15 ms 16084 KB Output is correct
14 Correct 14 ms 15900 KB Output is correct
15 Correct 31 ms 16952 KB Output is correct
16 Correct 19 ms 16980 KB Output is correct
17 Correct 31 ms 16980 KB Output is correct
18 Correct 20 ms 16924 KB Output is correct
19 Correct 34 ms 16784 KB Output is correct
20 Correct 24 ms 16828 KB Output is correct
21 Correct 34 ms 16724 KB Output is correct
22 Correct 24 ms 16852 KB Output is correct
23 Correct 33 ms 16724 KB Output is correct
24 Correct 22 ms 16724 KB Output is correct
25 Correct 29 ms 17120 KB Output is correct
26 Correct 19 ms 16980 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 79 ms 95436 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 15888 KB Output is correct
2 Correct 15 ms 15996 KB Output is correct
3 Correct 15 ms 16084 KB Output is correct
4 Correct 16 ms 16092 KB Output is correct
5 Correct 15 ms 15984 KB Output is correct
6 Correct 15 ms 16076 KB Output is correct
7 Correct 15 ms 15956 KB Output is correct
8 Correct 15 ms 15968 KB Output is correct
9 Correct 15 ms 15956 KB Output is correct
10 Correct 14 ms 15956 KB Output is correct
11 Correct 16 ms 15956 KB Output is correct
12 Correct 15 ms 16036 KB Output is correct
13 Correct 15 ms 16084 KB Output is correct
14 Correct 14 ms 15900 KB Output is correct
15 Correct 31 ms 16952 KB Output is correct
16 Correct 19 ms 16980 KB Output is correct
17 Correct 31 ms 16980 KB Output is correct
18 Correct 20 ms 16924 KB Output is correct
19 Correct 34 ms 16784 KB Output is correct
20 Correct 24 ms 16828 KB Output is correct
21 Correct 34 ms 16724 KB Output is correct
22 Correct 24 ms 16852 KB Output is correct
23 Correct 33 ms 16724 KB Output is correct
24 Correct 22 ms 16724 KB Output is correct
25 Correct 29 ms 17120 KB Output is correct
26 Correct 19 ms 16980 KB Output is correct
27 Incorrect 79 ms 95436 KB Output isn't correct
28 Halted 0 ms 0 KB -