Submission #1089815

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1089815	2024-09-17 08:20:10	peacebringer1667	Linear Garden (IOI08_linear_garden)	C++17	100 / 100	147 ms	65388 KiB

linear_garden

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#include<bits/stdc++.h>
#define ll long long
#define ldb long double
#define fi first
#define se second
#define sza(a) (int)a.size()
#define pir pair<int,int>
#define pirll pair<ll,ll>
using namespace std;
const int maxn = 1e6 + 5;
const int alp = 4;
int modu;
inline void add(int &x,int y){
  x %= modu;y %= modu;
  x = (x + y) % modu;
}
int dp[maxn][alp][alp];
void prepare_dp(int n){
  dp[n + 1][0][0] = 1;
    for (int p = n ; p > 0 ; p--){
      for (int i = 0 ; i <= 2 ; i++)
        for (int j = 0 ; j <= 2 ; j++){
          if (i < 2)
            add(dp[p][i + 1][max(j - 1,0)],dp[p + 1][i][j]);
      
        if (j <= 2)
          add(dp[p][max(i - 1,0)][j + 1],dp[p + 1][i][j]);
 
 
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