// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;
template<class T>
bool minimize(T &a, const T &b) {
if (a > b) return a = b, true;
return false;
}
template<class T>
bool maximize(T &a, const T &b) {
if (a < b) return a = b, true;
return false;
}
#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"
const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 2e5 + 5;
int numNode, numEdge, numQuery, ans[N];
ii edge[N];
struct DisjointSet {
vector<int> lab;
bool biparite;
DisjointSet(int n = 0): lab(n + 5, -1), biparite(true) {}
int root(int v) {
return (lab[v] < 0 ? v : lab[v] = root(lab[v]));
}
bool unite(int u, int v) {
u = root(u);
v = root(v);
if (u == v) return false;
if (lab[u] > lab[v]) swap(u, v);
lab[u] += lab[v];
lab[v] = u;
return true;
}
void add_edge(int u, int v) {
unite(u, v + numNode);
unite(v, u + numNode);
if (root(u) == root(u + numNode)) biparite = false;
if (root(v) == root(v + numNode)) biparite = false;
}
} dsu;
void init(void) {
cin >> numNode >> numEdge >> numQuery;
FOR(i, 1, numEdge) cin >> edge[i].fi >> edge[i].se;
}
void process(void) {
FOR(i, 1, numEdge) {
if (ans[i - 1] == numEdge + 1) {
ans[i] = numEdge + 1;
continue;
}
dsu = DisjointSet(2 * numNode);
FOR(j, 1, i) dsu.add_edge(edge[j].fi, edge[j].se);
if (dsu.biparite == false) ans[i] = numEdge + 1;
else {
FORR(j, numEdge, 1) {
dsu.add_edge(edge[j].fi, edge[j].se);
if (dsu.biparite == false) {
ans[i] = j;
break;
}
}
}
}
cout << ans[3] << '\n';
while(numQuery--) {
int l, r;
cin >> l >> r;
cout << (ans[l - 1] > r ? "YES\n" : "NO\n");
}
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
if (fopen(task".inp", "r")) {
freopen(task".inp", "r", stdin);
freopen(task".out", "w", stdout);
}
int tc = 1;
// cin >> tc;
while(tc--) {
init();
process();
}
return 0;
}
