33 lines
559 B
C++
33 lines
559 B
C++
#include <bits/stdc++.h>
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using namespace std;
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//递归，TLE
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int fib(int n) {
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if (n == 1) return 1;
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if (n == 2) return 1;
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return fib(n - 1) % 9997 + fib(n - 2) % 9997;
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}
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//while循环
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int fib2(int n) {
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if (n == 1) return 1;
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if (n == 2) return 1;
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int i = 3;
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int a = 1, b = 1;
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while (i <= n) {
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int c = a % 9997 + b % 9997;
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a = b % 9997;
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b = c % 9997;
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i++;
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}
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return b;
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}
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int main() {
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int n;
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cin >> n;
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cout << fib2(n) << endl;
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return 0;
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}
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