func_code_string: #include <bits/stdc++.h>   #define ll long long   #define ull unsigned long long   #define vll vector<ll>   using namespace std;   inline void sol() {     ll n, m;     cin >> n >> m;     vll a(n);     for(ll i=0;i<n;i++){       cin >> a[i];     }     vector<pair<int,double>> b(m);     for(int i=0;i<m;i++){       int r; double p;       cin >> r >> p;       b[i] = {r, p};     }     int rm;     for(rm = n-1; rm >= 0 and a[rm] == rm + 1; rm--);     if(rm == -1){       cout <<  1 n ;       return;     }     double ans = 1;     for(int i=0;i<m;i++){       if(b[i].first - 1 >= rm)         ans *= (1 - b[i].second);     }     // cout << 1 - ans << endl;     printf( %0.6lf n , 1 - ans);   }   int main() {     // cin.tie(0);     // ios_base::sync_with_stdio(false);        int t;     cin >> t;     while(t--)       sol();        return 0;   }