oj.uz

Submission #643522

# Submission time Handle Problem Language Result Execution time Memory
643522 2022-09-22T09:24:17 Z mychecksedad Palindromi (COCI22_palindromi) C++17
30 / 110
 79 ms 95396 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] * 37) % MOD;
    re[N - 1] = po(e[N - 1], MOD - 2);
    for(int i = N - 2; i >= 0; --i) re[i] = (re[i + 1] * 37) % 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 16 ms 15896 KB Output is correct
2 Correct 16 ms 16084 KB Output is correct
3 Correct 15 ms 16084 KB Output is correct
4 Correct 16 ms 16012 KB Output is correct
5 Correct 16 ms 16084 KB Output is correct
6 Correct 18 ms 16004 KB Output is correct
7 Correct 16 ms 16064 KB Output is correct
8 Correct 16 ms 15956 KB Output is correct
9 Correct 17 ms 16060 KB Output is correct
10 Correct 17 ms 15956 KB Output is correct
11 Correct 17 ms 15956 KB Output is correct
12 Correct 16 ms 16084 KB Output is correct
13 Correct 18 ms 16084 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 15896 KB Output is correct
2 Correct 16 ms 16084 KB Output is correct
3 Correct 15 ms 16084 KB Output is correct
4 Correct 16 ms 16012 KB Output is correct
5 Correct 16 ms 16084 KB Output is correct
6 Correct 18 ms 16004 KB Output is correct
7 Correct 16 ms 16064 KB Output is correct
8 Correct 16 ms 15956 KB Output is correct
9 Correct 17 ms 16060 KB Output is correct
10 Correct 17 ms 15956 KB Output is correct
11 Correct 17 ms 15956 KB Output is correct
12 Correct 16 ms 16084 KB Output is correct
13 Correct 18 ms 16084 KB Output is correct
14 Correct 16 ms 15956 KB Output is correct
15 Correct 39 ms 16980 KB Output is correct
16 Correct 20 ms 16892 KB Output is correct
17 Correct 36 ms 17024 KB Output is correct
18 Correct 22 ms 16984 KB Output is correct
19 Correct 35 ms 16784 KB Output is correct
20 Correct 28 ms 16732 KB Output is correct
21 Correct 37 ms 16804 KB Output is correct
22 Correct 26 ms 16724 KB Output is correct
23 Correct 33 ms 16756 KB Output is correct
24 Correct 25 ms 16712 KB Output is correct
25 Correct 30 ms 17120 KB Output is correct
26 Correct 20 ms 17100 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 79 ms 95396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 15896 KB Output is correct
2 Correct 16 ms 16084 KB Output is correct
3 Correct 15 ms 16084 KB Output is correct
4 Correct 16 ms 16012 KB Output is correct
5 Correct 16 ms 16084 KB Output is correct
6 Correct 18 ms 16004 KB Output is correct
7 Correct 16 ms 16064 KB Output is correct
8 Correct 16 ms 15956 KB Output is correct
9 Correct 17 ms 16060 KB Output is correct
10 Correct 17 ms 15956 KB Output is correct
11 Correct 17 ms 15956 KB Output is correct
12 Correct 16 ms 16084 KB Output is correct
13 Correct 18 ms 16084 KB Output is correct
14 Correct 16 ms 15956 KB Output is correct
15 Correct 39 ms 16980 KB Output is correct
16 Correct 20 ms 16892 KB Output is correct
17 Correct 36 ms 17024 KB Output is correct
18 Correct 22 ms 16984 KB Output is correct
19 Correct 35 ms 16784 KB Output is correct
20 Correct 28 ms 16732 KB Output is correct
21 Correct 37 ms 16804 KB Output is correct
22 Correct 26 ms 16724 KB Output is correct
23 Correct 33 ms 16756 KB Output is correct
24 Correct 25 ms 16712 KB Output is correct
25 Correct 30 ms 17120 KB Output is correct
26 Correct 20 ms 17100 KB Output is correct
27 Incorrect 79 ms 95396 KB Output isn't correct
28 Halted 0 ms 0 KB -