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#include <algorithm>
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vpii = vector<pii>;
using vi = vector<int>;
using vll = vector<long long>;
using mpii = map<int, int>;
using mpll = map<ll, ll>;
using db = long double;
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define lb lower_bound
#define ub upper_bound
#define make_unique(x) \
sort(all((x))); \
(x).resize(unique(all((x))) - (x).begin())
#define ceil(a, b) ((a) + (b)-1) / (b)
const int mod = (int)1e9 + 7;
const db pi = acos((db)-1);
const int dx[4]{1, 0, -1, 0};
const int dy[4]{0, 1, 0, -1};
#ifdef LOCAL
#include "debug.h"
#else
#define dbg(...) 42
#endif
/* stuff you should look for:
---------------------------
* special cases (n=1?)
* int overflow, array bounds
* do smth instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
*/
// 11
// 6 4 2
void solve() {
int n;
ll k;
cin >> n >> k;
vi v(n);
ll sum = 0;
for (auto &x : v) {
cin >> x;
sum += x;
}
vi tmp = v;
reverse(all(tmp));
vll prefix(n + 1);
vll suffix(n + 1);
prefix[0] = 0;
suffix[0] = 0;
for (int i = 1; i < n + 1; i++) {
prefix[i] = prefix[i - 1] + v[i - 1];
suffix[i] = suffix[i - 1] + tmp[i - 1];
}
if (k >= sum) {
cout << n << '\n';
} else {
int ans = 0;
if (k % 2 == 0) {
ll first = k / 2;
ll last = k / 2;
auto it_first = lower_bound(all(prefix), first);
auto it_last = lower_bound(all(suffix), last);
ans = (it_first - prefix.begin()) + (it_last - suffix.begin());
if (*it_first > first) {
ans--;
}
if (*it_last > last) {
ans--;
}
} else {
ll first = (k / 2) + 1;
ll last = k / 2;
auto it_first = lower_bound(all(prefix), first);
auto it_last = lower_bound(all(suffix), last);
ans = (it_first - prefix.begin()) + (it_last - suffix.begin());
if (*it_first > first) {
ans--;
}
if (*it_last > last) {
ans--;
}
}
cout << ans << '\n';
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int tt;
cin >> tt;
while (tt--) {
solve();
}
}
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