Submission #1176833

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Source Code Expand

#include<iostream>
#include<string>
#include<cstdio>
#include<algorithm>
#include<stack>
#include<queue>
#include<vector>
#include<cmath>
#include<utility>
#include<set>
#include<complex>
#include<map>
#define vi vector<int>
#define vvi vector<vector<int> >
#define ll long long int
#define vl vector<ll>
#define vvl vector<vector<ll>>
#define vb vector<bool>
#define vc vector<char>
#define vs vector<string>
#define ld long double
#define INF 1e9
#define EPS 0.0000000001
#define rep(i,n) for(int i=0;i<n;i++)
#define loop(i,s,n) for(int i=s;i<n;i++)
#define all(in) in.begin(), in.end()
#define MAX 9999999
using namespace std;
typedef pair<int, int> pii;
typedef pair<double,double>pdd;
typedef pair<ll,ll>pll;
int main(){
    vector<string>hoge;
    int n; cin>>n;
    rep(i,n){string temp; cin>>temp; hoge.push_back(temp);}
    int flag=0;
    rep(i,n)
    {if(hoge[i]=="A")flag++;
        else if(hoge[i]=="Un")flag--;
        if(flag<0)return puts("NO")*0;
    }
    if(flag)cout<<"NO"<<endl;
    else cout<<"YES"<<endl;
}

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