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- #include<bits/stdc++.h>
- using namespace std;
- unsigned long long dp[1111111];
- unsigned long long DPfib(int n)
- {
- if(n==0 || n==1) return n;
- if(dp[n]!=-1) return dp[n];
- else{
- dp[n]=DPfib(n-1)+DPfib(n-2);
- return dp[n];
- }
- }
- int main()
- {
- int n;
- scanf("%d", &n);
- for(int i=0;i<1111111;i++)P
- dp[i]=-1;
- printf("%lld", DPfib(n));
- return 0;
- }
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