This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int nmax = 1e6;
const int b = 27;
const int Mod = 1e9 + 7;
string s;
int h[nmax + 5];
int put[nmax + 5];
int get_hash(int st, int dr)
{
return (h[dr] - 1LL * h[st - 1] * put[dr - st + 1] % Mod + Mod) % Mod;
}
int solve(int st, int dr)
{
if(st > dr)
{
return 0;
}
for(int len=1;st + len - 1 < dr - len + 1;len++)
{
bool ok = (get_hash(st,st+len-1) == get_hash(dr-len+1,dr));
if(ok)
{
return 2 + solve(st + len, dr - len);
}
}
return 1;
}
void solve_test()
{
cin>>s;
s = "#" + s;
put[0] = 1;
for(int i=1;i<s.size();i++)
{
put[i] = 1LL * put[i - 1] * b % Mod;
h[i] = (1LL * h[i - 1] * b + s[i] - 'a' + 1) % Mod;
}
cout<<solve(1,s.size() - 1)<<'\n';
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
#ifdef home
freopen("nr.in","r",stdin);
freopen("nr.out","w",stdout);
#endif // home
int t;
cin>>t;
for(int test=1;test<=t;test++)
{
solve_test();
}
return 0;
}
Compilation message (stderr)
palindromic.cpp: In function 'void solve_test()':
palindromic.cpp:41:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
41 | for(int i=1;i<s.size();i++)
| ~^~~~~~~~~
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