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C++ solution. This instructs the compiler to precompute the first 50 Fibonacci numbers, enough to satisfy the constraints.
#include <bits/stdc++.h> using namespace std; constexpr array<long long, 50> compute() { array<long long, 50> fiboNums = {1, 1}; long long fib1 = 1, fib2 = 1; for (int i = 2; i < 50; i++) { long long newFib = fib1 + fib2; fib1 = fib2, fib2 = newFib; fiboNums[i] = fib2; } return fiboNums; } array<long long, 50> fiboNums = compute(); void solve() { long long n; cin >> n; if (*lower_bound(fiboNums.begin(), fiboNums.end(), n) != n) cout << "IsNotFibo" << endl; else cout << "IsFibo" << endl; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); int t; cin >> t; while (t--) solve(); return 0; }
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Is Fibo
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C++ solution. This instructs the compiler to precompute the first 50 Fibonacci numbers, enough to satisfy the constraints.