FBI please teach meee. i will give you a gift then.
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FBI please teach meee. i will give you a gift then.
FBI is such a prooo. But im better :()()()()()() i am his COACH
i don't know. Please help me what they do FBI
#include <bits/stdc++.h>
using namespace std;
int main()
{
string s;cin>>s;
int n=s.size();
vector<vector<int>>dp(n,vector<int>(18));
for(int i=0;i<n;i++)
{
dp[i][0]=(1<<(s[i]-'a'));
}
for(int k=1;k<18;k++)
{
for(int i=0;i+(1<<k)-1<n;i++)
{
dp[i][k]=(dp[i][k-1]|dp[i+(1<<(k-1))][k-1]);
}
}
auto get=[&](int l,int r)
{
int k=31-__builtin_clz(r-l+1);
int x=(dp[l][k]|dp[r-(1<<k)+1][k]);
return __builtin_popcount(x);
};
int q;cin>>q;
while(q--)
{
int l,r;cin>>l>>r;
cout<<get(l-1,r-1)<<endl;
}
}
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