bit array cpp hackerrank
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//https://www.hackerrank.com/challenges/bitset-1
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <set>
using namespace std;
int main() {
int d=0;
set<int>seeds;
unsigned long long n,s,p,q,
countedIterationsBefore=0, iterationsOnCurrentSeed=0,
modulus=0, nextVal=0, currVal=0;
//test inputs
n=3; s=p=q=1;
n=10000000; s=658061970; p=695098531; q=1430548937;
n=100000000; s=569099406; p=1607140150; q=823906344; //FAIL: should be 31, and is 100000000
n=100000000; s=1232077670; p=126810854; q=1536183938; //FAIL: should be 26, and is 100000000
cin>>n>>s>>p>>q;
modulus=(1<<31);
modulus--;
nextVal=s & modulus;
while(countedIterationsBefore<n){
iterationsOnCurrentSeed=0;
while(
nextVal < modulus &&
countedIterationsBefore + iterationsOnCurrentSeed < n
)
{
iterationsOnCurrentSeed++;
currVal = nextVal;
nextVal=currVal*p+q;
}
currVal=nextVal & modulus;
if (seeds.find(currVal) == seeds.end()){
countedIterationsBefore+=iterationsOnCurrentSeed;
seeds.insert(currVal);
}
}
cout<<countedIterationsBefore<<endl;
return 0;
}
Cpp
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