#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define S second
#define sz(x) (int)x.size()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define NFS ios_base::sync_with_stdio(0) , cin.tie(0) , cout.tie(0) ;
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
typedef long long ll;
//random_device(rd);
//mt19937 rng(rd());
//const long long FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
//template<class T> T randomize(T mod){
// return (uniform_int_distribution<T>(0, mod))(rng);
//}
const int E = 1e6+777;
const long long inf = 1e18+777;
const int N = 2e5+777;
const int MOD = 1e9+7;
const bool I = 0;
int n, k, r, a[N], pref[N][4000], need[4000];
int main(){const auto solve=[&]() -> void{
cin >> n >> k >> r;
for(int i = 1; i <= n; ++i){
cin >> a[i];
// cerr << i << " -> " << a[i] << '\n';
for(int j = 0; j < k; ++j){
pref[i][j] = pref[i-1][j] + (a[i] == j);
}
}
for(int i = 1; i <= r; ++i){
int type, cnt;
cin >> type >> cnt;
need[type] = cnt;
}
// cerr << "need\n";
// for(int i = 0; i < k; ++i){
// cerr << i << " -> " << need[i] << '\n';
// }
// cerr << "pref\n";
// for(int i = 0; i < k; ++i){
// cerr << "i: " << i << '\n';
// for(int j = 1; j <= n; ++j){
// cerr << pref[j][i] << ' ';
// }cerr << '\n';
// }
auto check = [&](int L, int R) -> bool{
for(int j = 0; j < k; ++j){
if(pref[R][j] - pref[L-1][j] < need[j]){
return false;
}
}
return true;
};
int res = INT_MAX;
for(int i = 1; i <= n; ++i){
int L = i, R = n, ans = -1;
while(L <= R){
int M = (L + R) / 2;
// cerr << "L: " << L << " R: " << R << " M: " << M << '\n';
if(check(i, M)){
R = (ans = M) - 1;
}else L = M + 1;
}
// cerr << i << " -> " << ans << '\n';
// cerr << " changed " << res << '\n';
if(ans != -1){
res = min(res, ans - i + 1);
}
}
if(res == INT_MAX) cout << "impossible";
else cout << res;
};NFS;int T=1;if(I)cin>>T;while(T--)solve();}
Compilation message
/usr/bin/ld: failed to convert GOTPCREL relocation; relink with --no-relax
collect2: error: ld returned 1 exit status
