题解 | #吃糖果#

//KY48
#include<cstdio>
#define N 21
int dp[N];
int main(){
    int n;
    scanf("%d",&n);
    dp[1] = 1;
    dp[2] = 2;
    for(int i = 3; i <= n ; ++i){
        dp[i] = dp[i-1] + dp[i-2];
    }
    printf("%d\n",dp[n]);
}