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#include <iostream> using namespace std; int memo[1005]; int fib(int x) { if(x == 1) { return 1; } if(x == 2) { return 1; } if(memo[x] != -1) { return memo[x]; } memo[x] = fib(x - 1) + fib(x - 2); return memo[x]; } int main() { int n; cin >> n; for(int i = 1; i <= n; i++) { memo[i] = -1; // -1 znaci deka ne e presmetano // se sto e razlicno od -1 znaci deka ni e presmetano } cout << fib(n) << endl; return 0; } // fib(7) --> fib(6) + fib(5) = 8 + 5 = 13 memo[7] = 13 // fib(6) --> fib(5) + fib(4) = 5 + 3 = 8 memo[6] = 8 // fib(5) --> fib(4) + fib(3) = 3 + 2 = 5 memo[5] = 5 // fib(4) --> fib(3) + fib(2) = 2 + 1 = 3 memo[4] = 3 // fib(3) --> fib(2) + fib(1) = 1 + 1 = 2 memo[3] = 2 // fib(2) --> 1 memo[2] = 1 // fib(1) --> 1 memo[1] = 1;
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