fun main() {
    val t = readLine()!!.toInt()
    for (ct in 1..t) {
        val (str, int, exp) = readLine()!!.split(' ').map { it.toInt() }
        val minAddStr = maxOf(0, (exp + int - str + 2) / 2)
        println(maxOf(exp - minAddStr + 1, 0))
    }
}

#include <bits/stdc++.h>

using namespace std;

const int N = 105;

int t;
int n, m;
int d[N], h[N];

int main() {
	cin >> t;
	for(int tc = 0; tc < t; ++tc){
		cin >> n >> m;
		int maxDH = -2e9;
		for(int i = 0; i < n; ++i){
			cin >> d[i] >> h[i];
			maxDH = max(maxDH, d[i] - h[i]);
		}

		int res = 1;	
		int maxD = *max_element(d, d + n);
		m -= maxD;
		if(m > 0){
			if(maxDH <= 0) res = -1;
			else res += (m + maxDH - 1) / maxDH; 	
		}	
		cout << res << endl;
	}
	
	return 0;
}

#include <bits/stdc++.h>

using namespace std;

const int N = int(3e5) + 99;

int t;
string s;
int nxt[N];

int main() {
	cin >> t;
	for(int tc = 0; tc < t; ++tc){
		cin >> s;
		for(int i = 0; i < s.size(); ++i)
			if(s[i] == '1') nxt[i] = i;
			else nxt[i] = (i == 0? -1 : nxt[i - 1]);		
		int res = 0;
		for(int r = 0; r < s.size(); ++r){
			int sum = 0;
			for(int l = r; l >= 0 && r - l < 20; --l){
				if(s[l] == '0') continue;
				sum += 1 << (r - l);
				if(sum <= r - (l == 0? -1 : nxt[l - 1]))
					++res;
			}
		}
		cout << res << endl;
	}	

	return 0;
}

#include<bits/stdc++.h>

using namespace std;

const int N = int(1e6) + 55;

int n, m;
vector <pair<int, int> > g[N];
int col[N];
bool cyc;
int res[N];

void dfs(int v){
	col[v] = 1;
	for(auto p : g[v]){
		int to = p.first, id = p.second;
		if(col[to] == 0){
			dfs(to);
			res[id] = 1;
		}
		else if(col[to] == 2)
			res[id] = 1;
		else{
			res[id] = 2;
			cyc = true;
		}
	}
	col[v] = 2;
}

int main(){
	cin >> n >> m;
	for(int i = 0; i < m; ++i){
		int u, v;
		cin >> u >> v;
		--u, --v;
		g[u].push_back(make_pair(v, i));
	}
	
	for(int i = 0; i < n; ++i)
			if(col[i] == 0)
				dfs(i);
			
	cout << (cyc? 2 : 1) << endl;
	for(int i = 0; i < m; ++i) cout << res[i] << ' ';
	cout << endl;
	return 0;
}

#include <bits/stdc++.h>

#define forn(i, n) for (int i = 0; i < int(n); i++)

using namespace std;

const int N = 200 * 1000 + 13;
const int INF = 2e9;
const int LOGN = 9;

struct node{
	int best;
	int mn[LOGN];
	node(){
		best = INF;
		forn(i, LOGN)
			mn[i] = INF;
	}
	int& operator [](int x){
		return mn[x];
	}
};

int a[N];
node t[4 * N];

void upd(node &t, int val){
	int x = val;
	forn(i, LOGN){
		if (x % 10 != 0)
			t[i] = min(t[i], val);
		x /= 10;
	}
}

node merge(node &a, node &b){
	node c;
	c.best = min(a.best, b.best);
	forn(i, LOGN){
		c[i] = min(a[i], b[i]);
		if (a[i] < INF && b[i] < INF)
			c.best = min(c.best, a[i] + b[i]);
	}
	return c;
}

void build(int v, int l, int r){
	if (l == r - 1){
		t[v] = node();
		upd(t[v], a[l]);
		return;
	}
	int m = (l + r) / 2;
	build(v * 2, l, m);
	build(v * 2 + 1, m, r);
	t[v] = merge(t[v * 2], t[v * 2 + 1]);
}

void upd(int v, int l, int r, int pos, int val){
	if (l == r - 1){
		t[v] = node();
		upd(t[v], val);
		return;
	}
	int m = (l + r) / 2;
	if (pos < m)
		upd(v * 2, l, m, pos, val);
	else
		upd(v * 2 + 1, m, r, pos, val);
	t[v] = merge(t[v * 2], t[v * 2 + 1]);
}

node get(int v, int l, int r, int L, int R){
	if (l == L && r == R)
		return t[v];
	int m = (l + r) / 2;
	if (R <= m)
		return get(v * 2, l, m, L, R);
	if (L >= m)
		return get(v * 2 + 1, m, r, L, R);
	node ln = get(v * 2, l, m, L, m);
	node rn = get(v * 2 + 1, m, r, m, R);
	return merge(ln, rn);
}

int main() {
	int n, m;
	scanf("%d%d", &n, &m);
	forn(i, n)
		scanf("%d", &a[i]);
	build(1, 0, n);
	forn(i, m){
		int t, x, y;
		scanf("%d%d%d", &t, &x, &y);
		--x;
		if (t == 1)
			upd(1, 0, n, x, y);
		else{
			node res = get(1, 0, n, x, y);
			printf("%d\n", res.best == INF ? -1 : res.best);
		}
	}
	return 0;
}

#include <bits/stdc++.h>

#define forn(i, n) for (int i = 0; i < int(n); i++)

using namespace std;

const int BUF = 10 * 1000 * 1000 + 13;
const int N = 300 * 1000 + 13;
const int M = 300 * 1000 + 13;
const int P = 400;

struct query{
	int t, x, y;
	int e0, e1;
};

int n, m;
query q[M];

int p[N], rk[N];

int cnt;
int* where[BUF];
int val[BUF];

void rollback(){
	while (cnt > 0){
		*where[cnt - 1] = val[cnt - 1];
		--cnt;
	}
}

int getp(int a){
	return (a == p[a] ? a : getp(p[a]));
}

void unite(int a, int b){
	a = getp(a), b = getp(b);
	if (a == b) return;
	if (rk[a] < rk[b]) swap(a, b);
	where[cnt] = &rk[a];
	val[cnt++] = rk[a];
	where[cnt] = &p[b];
	val[cnt++] = p[b];
	assert(cnt <= BUF);
	rk[a] += rk[b];
	p[b] = a;
}

int getpFast(int a){
	return (a == p[a] ? a : p[a] = getpFast(p[a]));
}

void uniteFast(int a, int b){
	a = getpFast(a), b = getpFast(b);
	if (a == b) return;
	if (rk[a] < rk[b]) swap(a, b);
	rk[a] += rk[b];
	p[b] = a;
}

struct edge{
	int v, u;
};

bool operator <(const edge &a, const edge &b){
	if (a.v != b.v)
		return a.v < b.v;
	return a.u < b.u;
}

edge edges[2 * M];
map<edge, int> rev;

bool used[2 * M];
bool state[2 * M];
int ans[M];
vector<int> cur;

void rebuild(int l){
	int r = min(m, l + P);
	forn(i, n) p[i] = i, rk[i] = 1;
	memset(used, 0, sizeof(used));
	memset(state, 0, sizeof(state));

	forn(i, l) if (q[i].t == 1){
		int e = (ans[i] ? q[i].e1 : q[i].e0);
		used[e] = true;
		state[e] ^= 1;
	}
	
	for (int i = l; i < r; ++i) if (q[i].t == 1)
		used[q[i].e0] = used[q[i].e1] = false;
	
	cur.clear();
	cnt = 0;
	forn(i, l) if (q[i].t == 1){
		int e = (ans[i] ? q[i].e1 : q[i].e0);
		if (used[e] && state[e]){
			state[e] = false;
			uniteFast(edges[e].v, edges[e].u);
		}
		else if (!used[e] && state[e]){
			state[e] = false;
			cur.push_back(e);
		}
	}
}

int get_edge(edge e){
	if (!rev.count(e)){
		int k = rev.size();
		edges[k] = e;
		rev[e] = k;
	}
	return rev[e];
}

int main(){
	scanf("%d%d", &n, &m);
	forn(i, m){
		scanf("%d%d%d", &q[i].t, &q[i].x, &q[i].y);
		--q[i].x, --q[i].y;
		if (q[i].t == 1){
			edge e({q[i].x, q[i].y});
			if (e.v > e.u) swap(e.v, e.u);
			q[i].e0 = get_edge(e);
			e.v = (e.v + 1) % n, e.u = (e.u + 1) % n;
			if (e.v > e.u) swap(e.v, e.u);
			q[i].e1 = get_edge(e);
		}
	}
	
	string res = "";
	ans[0] = 0;
	forn(i, m){
		if (i % P == 0)
			rebuild(i);
		
		int x = (q[i].x + ans[i]) % n;
		int y = (q[i].y + ans[i]) % n;
		if (x > y) swap(x, y);
		
		if (q[i].t == 1){
			rollback();
			int e = get_edge({x, y});
			auto it = find(cur.begin(), cur.end(), e);
			if (it == cur.end())
				cur.push_back(e);
			else
				cur.erase(it);
			ans[i + 1] = ans[i];
		}
		else{
			for (auto e : cur)
				unite(edges[e].v, edges[e].u);
			bool rc = (getp(x) == getp(y));
			ans[i + 1] = rc;
			res += ('0' + rc);
		}
	}
	
	puts(res.c_str());
	return 0;
}