Mai intai trebuie sa te autentifici.
Cod sursa(job #2544928)
Utilizator | Data | 12 februarie 2020 17:59:38 | |
---|---|---|---|
Problema | PScPld | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.73 kb |
#include <bits/stdc++.h>
#define NMAX 1000005
using namespace std;
string s, s2;
int v[2 * NMAX];
int main(){
ios::sync_with_stdio(false);
freopen("pscpld.in", "r", stdin);
freopen("pscpld.out", "w", stdout);
cin >> s;
s2 += '#';
for(auto it: s)
{
s2 += it;
s2 += '#';
}
v[0] = 1;
int c = 0, r = 0;
long long rez = 0;
for(int i = 1; i < s2.size(); ++i){
int lg = 0;
if(i <= r)
lg = min(v[2 * c - i], r - i + 1);
while(i - lg >= 0 && i + lg < s2.size() && s2[i - lg] == s2[i + lg])
++lg;
v[i] = lg;
if(i + lg - 1 > r){
r = i + lg - 1;
c = i;
}
if(i % 2 == 0)
rez += lg / 2;
else rez += (lg + 1) / 2;
}
cout << rez << '\n';
return 0;
}