#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
const int mxN=1e5;
int n, cnt[26], p[mxN], ft[mxN+1];
string s, a, b;
ll ans;
vector<int> oc1[26], oc2[26];
void upd(int i) {
for (++i; i<=n; i+=i&-i)
++ft[i];
}
int qry(int i) {
int r=0;
for (++i; i; i-=i&-i)
r+=ft[i];
return r;
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> s;
for (char c : s)
++cnt[c-'a'];
for (int i=0; i<26; ++i)
cnt[i]/=2;
for (int i=0, x=0; i<2*n; ++i) {
if (cnt[s[i]-'a'])
a+=s[i], ans+=x, --cnt[s[i]-'a'];
else
b+=s[i], ++x;
}
for (int i=0; i<n; ++i) {
oc1[a[i]-'a'].push_back(i);
oc2[b[i]-'a'].push_back(i);
}
for (int i=0; i<26; ++i)
for (int j=0; j<oc1[i].size(); ++j)
p[oc2[i][j]]=oc1[i][j];
for (int i=0; i<n; ++i) {
ans+=i-qry(p[i]);
upd(p[i]);
}
cout << ans;
return 0;
}
Compilation message
Main.cpp: In function 'int main()':
Main.cpp:44:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | for (int j=0; j<oc1[i].size(); ++j)
| ~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1220 KB |
Output is correct |
| 3 |
Correct |
6 ms |
2060 KB |
Output is correct |
| 4 |
Correct |
8 ms |
2744 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1220 KB |
Output is correct |
| 3 |
Correct |
6 ms |
2060 KB |
Output is correct |
| 4 |
Correct |
8 ms |
2744 KB |
Output is correct |
| 5 |
Correct |
1 ms |
320 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
0 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1220 KB |
Output is correct |
| 3 |
Correct |
6 ms |
2060 KB |
Output is correct |
| 4 |
Correct |
8 ms |
2744 KB |
Output is correct |
| 5 |
Correct |
1 ms |
204 KB |
Output is correct |
| 6 |
Correct |
10 ms |
2636 KB |
Output is correct |
| 7 |
Correct |
9 ms |
2648 KB |
Output is correct |
| 8 |
Correct |
8 ms |
2648 KB |
Output is correct |
| 9 |
Correct |
9 ms |
2620 KB |
Output is correct |
| 10 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 11 |
Correct |
8 ms |
2488 KB |
Output is correct |
| 12 |
Correct |
8 ms |
2492 KB |
Output is correct |
| 13 |
Correct |
8 ms |
2500 KB |
Output is correct |
| 14 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 15 |
Correct |
8 ms |
2520 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Correct |
1 ms |
332 KB |
Output is correct |
| 3 |
Correct |
1 ms |
320 KB |
Output is correct |
| 4 |
Correct |
1 ms |
332 KB |
Output is correct |
| 5 |
Correct |
0 ms |
332 KB |
Output is correct |
| 6 |
Correct |
0 ms |
332 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
1 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
1 ms |
332 KB |
Output is correct |
| 11 |
Correct |
0 ms |
332 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1220 KB |
Output is correct |
| 3 |
Correct |
6 ms |
2060 KB |
Output is correct |
| 4 |
Correct |
8 ms |
2744 KB |
Output is correct |
| 5 |
Correct |
1 ms |
320 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
0 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| 9 |
Correct |
1 ms |
204 KB |
Output is correct |
| 10 |
Correct |
10 ms |
2636 KB |
Output is correct |
| 11 |
Correct |
9 ms |
2648 KB |
Output is correct |
| 12 |
Correct |
8 ms |
2648 KB |
Output is correct |
| 13 |
Correct |
9 ms |
2620 KB |
Output is correct |
| 14 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 15 |
Correct |
8 ms |
2488 KB |
Output is correct |
| 16 |
Correct |
8 ms |
2492 KB |
Output is correct |
| 17 |
Correct |
8 ms |
2500 KB |
Output is correct |
| 18 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 19 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 20 |
Correct |
0 ms |
204 KB |
Output is correct |
| 21 |
Correct |
1 ms |
332 KB |
Output is correct |
| 22 |
Correct |
1 ms |
320 KB |
Output is correct |
| 23 |
Correct |
1 ms |
332 KB |
Output is correct |
| 24 |
Correct |
0 ms |
332 KB |
Output is correct |
| 25 |
Correct |
0 ms |
332 KB |
Output is correct |
| 26 |
Correct |
1 ms |
332 KB |
Output is correct |
| 27 |
Correct |
1 ms |
332 KB |
Output is correct |
| 28 |
Correct |
1 ms |
332 KB |
Output is correct |
| 29 |
Correct |
1 ms |
332 KB |
Output is correct |
| 30 |
Correct |
0 ms |
332 KB |
Output is correct |
| 31 |
Correct |
0 ms |
204 KB |
Output is correct |
| 32 |
Correct |
9 ms |
2516 KB |
Output is correct |
| 33 |
Correct |
9 ms |
2648 KB |
Output is correct |
| 34 |
Correct |
9 ms |
2648 KB |
Output is correct |
| 35 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 36 |
Correct |
8 ms |
2648 KB |
Output is correct |
| 37 |
Correct |
8 ms |
2596 KB |
Output is correct |
| 38 |
Correct |
8 ms |
2588 KB |
Output is correct |
| 39 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 40 |
Correct |
8 ms |
2520 KB |
Output is correct |
| 41 |
Correct |
8 ms |
2484 KB |
Output is correct |
