Submission #670388

#	Time	Username	Problem	Language	Result	Execution time	Memory
670388		nolimiya	Palindromic Partitions (CEOI17_palindromic)	C++17	0 / 100	32 ms	70688 KiB

palindromic

#include <bits/stdc++.h>
#include <math.h>
//in the name of god,aka allah
//**gray sety orz**
#pragma GCC optimize("unroll-loops")
using namespace std;
#define pi pair<long long , long long>
#define pii pair<long long , pair<long long , long long>>
const int maxm =1e6 + 5;
long long aval = 27;
const long long mod = 1e9 + 7 ;
typedef long long ll;
ll l,r,mid;
ll n,m;
ll dis[maxm] , sum[maxm];
bool isval(int mid){
    //cout << mid <<" " << mid*mid-mid <<endl;
    if (((mid-1)*mid)/2 < m) return 0;
    return 1;
}
int darage[maxm] , ss , mm;
queue<int> q;
vector<pi> g[maxm] , z[maxm];
ll sath[maxm];
bool vis[maxm] , gos[maxm];
int pedaret[maxm];
ll get_par(ll v){
    if (pedaret[v]==v) return v;
    return pedaret[v] = get_par(pedaret[v]);
}
void merge(ll r , ll q){
    if (get_par(r)!=get_par(q))l+=max(darage[r],darage[q])*1ll*sath[r]*1ll*sath[q];
    r = get_par(r) , q = get_par(q);
    if (r!=q){
        if (sath[r]<sath[q]) swap(r,q);
        pedaret[q] = r;
        sath[r] += sath[q];
    }
    return ;
}
ll pars1[maxm] , pars2[maxm];
vector<ll> se[maxm];
set<pi> st;
int rp[maxm];
pi w[maxm];
int dp[maxm];
//ll rw[maxm][maxm];
map<ll,ll> mp;
void solve(){
	string s;
	cin >>s;
	l = 0 , r = 0 , mid = 0 , ss = 1;
	for (int i=0; i<=s.size()/2-1; i++){
		l*=aval , l%=mod;
		l+=(s[i]-'a'+1);
		l%=mod;
		r+=(((s[s.size()-1-i]-'a')+1)*ss);
		r%=mod;
		ss*=aval;
		ss%=mod;
		if (l==r) mid+=2 , ss = 1 , l = 0 , r = 0;
	}
	if (l!=0 || s.size()%2) mid++;
	cout<<mid<<endl;
}
int main() {
	ios::sync_with_stdio (0), cin.tie (0), cout.tie (0);
    int t;
    cin >>t;
    while (t--){
    	solve();
    }
}

Compilation message (stderr)

palindromic.cpp: In function 'void solve()':
palindromic.cpp:53:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |  for (int i=0; i<=s.size()/2-1; i++){
      |                ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 20
• Subtask 3: 0 / 25
• Subtask 4: 0 / 40