Submission #640363

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
640363	2022-09-14 11:06:26	PoonYaPat	Linear Garden (IOI08_linear_garden)	C++14	95 / 100	100 ms	2416 KiB

linear_garden

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,mod,ans;
string s;
ll power(ll a, ll n) {
    ll res=1;
    while (n) {
        if (n%2==1) res=(res*a)%mod;
        a=(a*a)%mod;
        n/=2;
    }
    return res;
}
int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin>>n>>mod>>s;
    int dif=2,mmax=2,mmin=2;
    for (int i=0; i<n; ++i) {
        if (s[i]=='P' && dif<=mmin+1) { //consider if P change to L
            int ma=max(mmax,dif+1), mi=mmin;
            if (ma-mi==2) {
                if (dif==mi) ans=(ans+power(2,(n-i)/2))%mod; //dif+1 is on the center of the strip
 
 
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