Submission #1020138

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1020138	2024-07-11 15:30:19	bachhoangxuan	Security Gate (JOI18_security_gate)	C++17	100 / 100	1184 ms	227668 KiB

securitygate

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#include<bits/stdc++.h>
using namespace std;
#define int long long
const int mod=1e9+7;
const int maxn = 305;
int n,ans;
char s[maxn];
int f[maxn][maxn][maxn],g[maxn][2*maxn][3];
int F[maxn][maxn];
bool ok(int i,int x){
    if(s[i]=='(' && x==-1) return false;
    if(s[i]==')' && x==1) return false;
    return true;
};
void dp1(){
    F[0][0]=1;
    for(int i=1;i<=n;i++){
        for(int j=0;j<i;j++) for(int x:{-1,1}){
            if(!ok(i,x)) continue;
            int nj=j+x;
            if(nj>=0) F[i][nj]=(F[i][nj]+F[i-1][j])%mod;
        }
    }
    ans=(ans+F[n][0])%mod;
    //cout << ans << '\n';
}
void dp2(){
 
 
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• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 43 / 43
• Subtask 5: 27 / 27