Submission #972621

#TimeUsernameProblemLanguageResultExecution timeMemory
972621vjudge1Palindromic Partitions (CEOI17_palindromic)C++17
0 / 100
7 ms17500 KiB
#pragma GCC optimize ("Ofast") #include <bits/stdc++.h> using namespace std; typedef long long ll; #define Abdoo ios::sync_with_stdio(0);cin.tie(0);cout.tie(0); void pr(vector<int> v) { for (int i = 0; i < v.size(); ++i) { cout << v[i] << " "; } cout << "\n"; } const int N = 1e6 +5, MOD = 1e9 + 9; ll pw[N], inv[N], pref[N], p = 31; ll add(ll a,ll b){ return (a+b) % MOD; } ll mul(ll a,ll b){ return 1ll * (a * b)%MOD; } ll sub(ll a, ll b){ return ((a-b) % MOD + MOD) % MOD; } ll fast_power(ll b, ll p){ ll ans = 1; while(p){ if(p&1) ans = mul(ans, b); b = mul(b, b); p /= 2; } return ans; } void pre(){ pw[0] = inv[0] = 1; ll inverse = fast_power(p, MOD - 2); for(int i = 1; i < N; i++){ pw[i] = mul(pw[i-1] , p); inv[i] = mul(inv[i-1], inverse); } } ll getHash(int l, int r){ l++,r++; return mul(add(pref[r],MOD - pref[l-1]), inv[l-1]); } void generateHash(string &s){ for (int i = 1; i <= (int)s.size(); ++i) { int idx = s[i-1]-'a'+1; pref[i] = mul(idx, pw[i-1]); pref[i] = add(pref[i],pref[i-1]); } } int main() { Abdoo pre(); int tc = 1; cin >> tc; while (tc--) { string s; cin >> s; generateHash(s); int st = 0, en = s.size()- 1, ans = 0; while(st < en){ int st2 = st, en2 = en; while(st2 < en2 && getHash(st, st2) != getHash(en2, en)){ st2++, en2--; } if(st2 < en2 &&getHash(st, st2) == getHash(en2, en)){ //cout << st << " " << st2 << " " << en2 << " " << en << "\n"; ans += 2; } st = st2, en = en2; st++, en--; } ans++; cout << ans << "\n"; } return 0; }

Compilation message (stderr)

palindromic.cpp: In function 'void pr(std::vector<int>)':
palindromic.cpp:10:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for (int i = 0; i < v.size(); ++i) {
      |                     ~~^~~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...