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Create 1922. Count Good Numbers #766

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Apr 13, 2025
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Create 1922. Count Good Numbers #766

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23 changes: 23 additions & 0 deletions 1922. Count Good Numbers
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Original file line number Diff line number Diff line change
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class Solution {
public:
int M = 1e9+7;

long long binpow(long long a, long long b) {
a %= M;
long long res = 1;
while (b > 0) {
if (b & 1)
res = res * a % M;
a = a * a % M;
b >>= 1;
}
return res;
}

int countGoodNumbers(long long n) {
long long even_positions = (n + 1) / 2;
long long odd_positions = n / 2;
long long result = (binpow(5, even_positions) * binpow(4, odd_positions)) % M;
return result;
}
};
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