#include<bits/stdc++.h>
using namespace std;

//* ATCODER
#include<atcoder/all>
using namespace atcoder;
typedef modint998244353 mint;
//*/

/* BOOST MULTIPRECISION
#include<boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;
//*/

typedef long long ll;

#define rep(i, s, n) for (int i = (int)(s); i < (int)(n); i++)
#define rrep(i, s, n) for (int i = (int)(n)-1; i >= (int)(s); i--)

template <typename T> bool chmin(T &a, const T &b) {
	if (a <= b) return false;
	a = b;
	return true;
}

template <typename T> bool chmax(T &a, const T &b) {
	if (a >= b) return false;
	a = b;
	return true;
}

template <typename T> T max(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmax(ret, a[i]);
	return ret;
}

template <typename T> T min(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmin(ret, a[i]);
	return ret;
}

template <typename T> T sum(vector<T> &a){
	T ret = 0;
	for (int i=0; i<(int)a.size(); i++) ret += a[i];
	return ret;
}

ll floor_sqrt(ll n){
	ll ub = 3e9 + 30;
	ll lb = 0;
	while(ub - lb > 1){
		ll t = (ub + lb) / 2;
		if (t * t <= n){
			lb = t;
		}else{
			ub = t;
		}
	}
	return lb;
}


//defmodfact
const int COMinitMAX = 992844;
mint fact[COMinitMAX+1], factinv[COMinitMAX+1];

void modfact(){
	fact[0] = 1;
	for (int i=1; i<=COMinitMAX; i++){
		fact[i] = fact[i-1] * i;
	}
	factinv[COMinitMAX] = fact[COMinitMAX].inv();
	for (int i=COMinitMAX-1; i>=0; i--){
		factinv[i] = factinv[i+1] * (i+1);
	}
}

mint cmb(int a, int b){
	if (a<b || b<0) return mint(0);
	return fact[a]*factinv[b]*factinv[a-b];
}
//--------


void solve(){
	ll n, k; cin >> n >> k;
	ll v = (n+1)*(n+1)-k*4;
	ll sv = floor_sqrt(v);
	//cout << v << ' ' << sv << endl;
	if (sv * sv != v){
		cout << 0 << '\n';
		return;
	}
	if ((n+1+sv) % 2 != 0){
		cout << 0 << '\n';
		return;
	}
	mint ans = 0;
	{
		ll targ = (n+1-sv) / 2;
		ans += cmb(n, targ-1);
	}
	{
		ll targ = (n+1+sv) / 2;
		if (sv != 0){
			ans += cmb(n, targ-1);

		}
	}
	cout << ans.val() << '\n';
}

int main(){
	modfact();
	int t; cin >> t;
	while(t--) solve();
}