https://ac.nowcoder.com/acm/contest/322/G

題解：預處理，給我搜，暴力就完事了

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,q,ans; int a[N]; char str; void dfs(int x,int c){if(n<=c){ans++;return ;}if(x==3){dfs(2,c+1);dfs(3,c+1);}else{dfs(1,c+1);dfs(2,c+1);dfs(3,c+1);}} int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endiffor(int i=1;i<=10;i++){ans=0;n=i;dfs(0,0);a[i]=ans;//cout << ans << endl;}scanf("%d",&t);//for(int i=1;i<=t)while(t--){scanf("%d",&n);cout << a[n]<< endl;}//cout << "Hello world!" << endl;return 0; }

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