https://codeforces.com/contest/1152/problem/D

題解：DP+規律?

/* *@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 #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=1000+10; const int M=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,p,l,r,u,v; int ans,cnt,flag,temp,sum; ll dp[N][N],DP[N][N]; char str; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){for(int i=1;i<=1000;i++){dp[i][0]=(i+1)/2;for(int j=1;j<=i;j++){dp[i][j]=(dp[i-1][j]+1+dp[i-1][j-1])%MOD;if(j>=2)dp[i][j]=(dp[i][j]+dp[i][j-2])%MOD;//printf("%9lld%c",dp[i][j]," \n"[j==i]);}}while(~scanf("%d",&n)){cout<<dp[n][n]<<endl;}//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

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