Submission #819789

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
819789	2023-08-10 13:32:14	canadavid1	Linear Garden (IOI08_linear_garden)	C++14	100 / 100	121 ms	45312 KiB

linear_garden

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#include <bits/stdc++.h>
using namespace std;
#define all(x) begin(x),end(x)
vector<array<int,9>> dp; // 5*diff + min + 2
vector<array<bool,9>> s;
int N,M;
int num_combinations(int off,int mins, int maxs)
{
    if(maxs > 2 || mins < -2) return 0;
    if(off >= N) return 1;
    mins = min(mins,0);
    maxs = max(maxs,0);
    if(s[off][maxs-3*mins]) return dp[off][maxs-3*mins];
    // try L
    int comb = 0;
    comb += num_combinations(off+1,mins-1,maxs-1);
    comb += num_combinations(off+1,mins+1,maxs+1);
    comb %= M;
    dp[off][maxs-3*mins] = comb;
    s[off][maxs-3*mins] = true;
    return comb;
}
signed main()
{
    cin >> N >> M;
    dp.assign(N,array<int,9>{});
 
 
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