WA了两个点，找不出错误，求神犇

#include<bits/stdc++.h>
#define x first
#define y second
using namespace std;
const int N=2e5+10,inf=0x3f3f3f3f,mod=1e9+7;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef long long ll;
/*

*/
map<int,int> m,e,check;
ll cntm,cnte,n,a[N],sum;
string s;
int main(){
	cin>>n;
	for(int i=0;i<n;i++) cin>>a[i];
	cin>>s;
	for(int i=0;i<n;i++){
		if(s[i]=='M') m[a[i]]++;
		if(s[i]=='E') for(auto j:m) e[j.x*10+a[i]]+=j.y;
		if(s[i]=='X'&&e.size()){
			for(auto j:e){
				check[0]=check[1]=check[2]=check[3]=1;
				check.erase(a[i]),check.erase(j.x%10),check.erase(j.x/10);
				sum+=check.begin()->x*j.y;
				//printf("check.begin()->x=%d  sum=%d  j.x=%d  j.y=%d  s[i]=%c  a[i]=%d\n",check.begin()->x,sum,j.x,j.y,s[i],a[i]);
			}
		}
	}
	cout<<sum;
	return 0;
}