t=int(input())
for i in range(t):
x=input()
n=int(x.split()[0])
m=int(x.split()[1])
a=input()
a1=a.split()
for i in range(n):
a1[i]=int(a1[i])
if m>sum(a1): print(0)
else: print(sum(a1)-m)
#include <bits/stdc++.h>
using namespace std;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int l;
cin>>l;
while(l--){
int a, k;
cin>>a>>k;
int x, add = 0;
for(int i = 0; i < a; i++){
cin>>x;
add += x;
}
if(add - k <= 0){
cout<<0<<"\n";
}
else{
cout<<(add-k)<<"\n";
}
}
}931A - Friends Meeting | 1594A - Consecutive Sum Riddle |
1466A - Bovine Dilemma | 454A - Little Pony and Crystal Mine |
2A - Winner | 1622B - Berland Music |
1139B - Chocolates | 1371A - Magical Sticks |
1253A - Single Push | 706B - Interesting drink |
1265A - Beautiful String | 214A - System of Equations |
287A - IQ Test | 1108A - Two distinct points |
1064A - Make a triangle | 1245C - Constanze's Machine |
1005A - Tanya and Stairways | 1663F - In Every Generation |
1108B - Divisors of Two Integers | 1175A - From Hero to Zero |
1141A - Game 23 | 1401B - Ternary Sequence |
598A - Tricky Sum | 519A - A and B and Chess |
725B - Food on the Plane | 154B - Colliders |
127B - Canvas Frames | 107B - Basketball Team |
245A - System Administrator | 698A - Vacations |