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Copy pathSorted_Groups.cpp
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53 lines (46 loc) · 1.04 KB
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Copy pathSorted_Groups.cpp
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53 lines (46 loc) · 1.04 KB
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#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
cin >> t;
while(t--) {
int n;
cin >> n;
string s;
cin >> s;
string A = "", B = "";
char lastA = 0, lastB = 0;
for(char c : s) {
if(c >= lastA && c >= lastB) {
if(lastA > lastB) {
A += c;
lastA = c;
} else {
B += c;
lastB = c;
}
}
else if(c >= lastA) {
A += c;
lastA = c;
}
else {
B += c;
lastB = c;
}
}
// merge back
string res = "";
int i = 0, j = 0;
for(char c : s) {
if(i < (int)A.size() && A[i] == c) {
res += A[i++];
} else {
res += B[j++];
}
}
cout << res << '\n';
}
}