#include <bits/stdc++.h>
using namespace std;
struct segment_tree {
int n;
vector<int> tree;
void init(int i) {
n = 1;
while (n < i)
n <<= 1;
tree.resize(n, 0);
}
void set(int i) {
i += n;
tree[i] = 1;
for (i /= 2; i > 0; i /= 2)
tree[i] = tree[2 * i] + tree[2 * i + 1];
}
int get(int l, int r) {
int res = 0;
while (l <= r) {
if (l & 1)
res += tree[l++];
if (!(r & 1))
res += tree[r--];
r /= 2, l /= 2;
}
return res;
}
};
long long count_swaps(vector<int> s) {
int n = s.size(), shift = 0;
vector<vector<int>> left(n / 2 + 1), right(n / 2 + 1);
for (int i = n - 1; i >= 0; --i) {
if (s[i] < 0)
left[-s[i]].push_back(i);
else
right[s[i]].push_back(i);
}
long long res = 0;
segment_tree st;
st.init(n);
for (int i = 0, j; i < n; ++i) {
if (s[i] == 0) {
// shift--;
continue;
} else if (s[i] > 0) {
j = left[s[i]][left[s[i]].size() - 1];
left[s[i]].pop_back();
right[s[i]].pop_back();
shift = st.get(i + 1, j - 1);
res += j - i - shift;
s[j] = s[i] = 0;
st.set(i), st.set(j);
} else {
j = right[-s[i]][right[-s[i]].size() - 1];
right[-s[i]].pop_back();
left[-s[i]].pop_back();
shift = st.get(i + 1, j - 1);
res += j - i - shift - 1;
s[j] = s[i] = 0;
st.set(i), st.set(j);
}
// shift++;
}
return res;
}
// int main() {
// ios::sync_with_stdio(false);
// cin.tie(0);
// int n;
// cin >> n;
// vector<int> s(n);
// for (int &i : s)
// cin >> i;
// cout << count_swaps(s) << endl;
// }
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 6 |
4 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 6 |
4 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 6 |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 6 |
4 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 6 |
4 |
Halted |
0 ms |
0 KB |
- |