when submitted under c++14/c++17 it was giving runtime error but accepted by c++20

include <bits/stdc++.h>

define int long long

define mod 1000000007

using namespace std; int fast_pow (int b , int p) { if(p==0) return 1; return p%2 ? (b*(fast_pow((b*b)%mod,p/2)%mod))%mod : fast_pow((b*b)%mod,p/2)%mod ; }

int32_t main() { ios_base::sync_with_stdio(false); cin.tie(NULL); #ifndef ONLINE_JUDGE freopen("input.txt","r",stdin); freopen("output.txt","w",stdout); freopen("error.txt","w",stderr);

#endif
int t;
cin>>t;
while(t--){


    int n,m;
    cin>>n>>m;
    vector<int> v(n);
    for(int &a:v) cin>>a;
    string s;
    cin>>s;
    int i=0,j=n-1;
    for(auto val:s){
        if(i>=j) break;
        if(val=='L') i++;
        else j--;
    }
    int p=v[i];
    vector<int> ans;
    p%=m;
    ans.push_back(p);
    for(int k=s.size()-2;k>=0;k--){
        if(s[k]=='L'){
            i--;
            p*=v[i];
            p%=m;


        }
        else{
            j++;
            p*=v[j];
            p%=m;

        }
        ans.push_back(p);

    }
    std::reverse(ans.begin(), ans.end());
    for(auto val:ans) cout<<val<<" ";
    cout<<endl;


}

}