825 B | 825 chars
#include <bits/stdc++.h>
#define for1(s,n) for(int i = s; i < n; i++)
#define for1j(s,n) for(int j = s; j < n; j++)
using namespace std;
typedef long long ll;
ll T, N, ar[110];
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> T;
while(T--) {
cin >> N;
for1(0, N) {
cin >> ar[i];
}
bool chk = false;
for1(0, N) {
if(ar[i] > i) {
chk = true;
}
for1j(0, i) {
if(ar[j] >= ar[i]) {
ar[j]++;
}
}
}
if(chk) {
cout << "IMPOSSIBLE\n";
}
else {
for1(0, N) {
cout << ar[i] + 1 << " ";
}
cout << "\n";
}
}
}