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#include
using namespace std; int memo[105]; int fib(int n) { if(n <= 2) { return 1; } if(memo[n] != -1) { return memo[n]; } return memo[n] = fib(n - 1) + fib(n - 2); } int main() { int n; cin >> n; for(int i = 0; i <= n; i++) { memo[i] = -1; } cout << fib(n) << endl; return 0; } // fib(7) = fib(6) + fib(5) //
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