Submission #710287

#	Time	Username	Problem	Language	Result	Execution time	Memory
710287		ktkerem	Palindromic Partitions (CEOI17_palindromic)	C++17	100 / 100	251 ms	11148 KiB

palindromic

/*#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")/**/
#include<bits/stdc++.h>
typedef long long ll;
typedef long double ld;
#define llll std::pair<ll , ll>
#define pb push_back
#define fi first
#define sec second
#define all(a) a.begin() , a.end()
#define debug std::cout << "!!ALERT ALERT!!" << std::endl;
const ll limit = 1e9+7;
const ll sus = 1e5 + 5;
std::mt19937 rng(std::chrono::steady_clock::now().time_since_epoch().count());
ll rnd(ll a , ll b){
    return (rng() % (b-a+1)) + a;
}
/*global variables*/
ll n;std::string h;
ll t = 1;
/**/
/*functions*/
ll binpow(ll x , ll y){
    ll g = 1;
    while(y){
        if(y & 1){
            g*=x;
            g%=limit;
        }
        x*=x;
        x%=limit;y/=2;
    }
    return g;
}
/**/
void solve(){
    std::cin >> h;
    n = h.size();
    ll fo = 0 ,so = 0;
    ll l = 0 , r = n-1;
    ll ls = 1;
    ll ans = 1;
    std::string ff , ss;
    while(r > l){
        fo = ((fo * 31) + (h[l] - 'a' + 1))%limit;
        so = (so + ((binpow(31 , ls - 1) * (h[r] - 'a' + 1)) % limit))%limit;
        if(fo == so){
            if(r-1 == l){
                ans--;
            }
            ans+=2;
            fo = 0;so = 0;
            ls = 0;
        }
        r--;l++;
        ls++;
    }
    std::cout << ans;
    if(t != 0){
        std::cout << std::endl;
    }
    return;/**/
}
int main(){
    std::ios_base::sync_with_stdio(false);std::cin.tie(NULL);
    /*#ifndef ONLINE_JUDGE
        freopen("in.txt" , "r" , stdin);
        freopen("out.txt" , "w" , stdout);
    #endif*/
    std::cin >> t;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

palindromic.cpp:5:78: warning: "/*" within comment [-Wcomment]
    5 | #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")/**/
      |

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40