/*#pragma GCC optimize("O3")
#pragma GCC target ("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")*/
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = 1e6;
int n, b[N], p[N], t[N*4], ans;
pair<int, int> a[N];
void clr() {
for (int i = 1; i < N*4; i++) {
t[i] = 0;
}
return;
}
void build (int v, int tl, int tr) {
if (tl == tr) {
t[v] = 0;
return;
}
int tm = (tl+tr) / 2;
build(v+v, tl, tm);
build(v+v+1, tm+1, tr);
t[v] = t[v+v] + t[v+v+1];
}
void upd (int v, int tl, int tr, int p) {
if (tl == tr) {
t[v]++;
return;
}
int tm = (tl+tr) / 2;
if (p <= tm) upd(v+v, tl, tm, p);
else upd(v+v+1, tm+1, tr, p);
t[v] = t[v+v] + t[v+v+1];
}
int get (int v, int tl, int tr, int l, int r) {
if (l <= tl && tr <= r) return t[v];
if (tr < l || r < tl) return 0;
int tm = (tl+tr) / 2;
return get(v+v, tl, tm, l, r) + get(v+v+1, tm+1, tr, l, r);
}
signed main () {
//freopen("", "r", stdin);
//freopen("", "w", stdout);
ios_base::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i].first;
a[i].second = i;
}
sort(a+1, a+n+1);
int num = 100;
a[0].first = -100;
for (int i = 1; i <= n; i++) {
if (a[i].first > a[i-1].first) num++;
b[a[i].second] = num;
}
build(1, 1, n);
for (int i = 1; i <= n; i++) {
p[i] = get(1, 1, n, 1, b[i] - 1);
upd(1, 1, n, b[i]);
}
clr();
reverse(b+1, b+n+1);
build(1, 1,n);
for (int i = 1; i <= n; i++) {
int j = n-i+1;
ans += p[j] * get(1, 1, n, 1, b[i]-1);
upd(1, 1, n, b[i]);
}
cout << ans;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
12 ms |
31572 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
153 ms |
41036 KB |
Output is correct |
2 |
Correct |
157 ms |
41560 KB |
Output is correct |
3 |
Correct |
161 ms |
41576 KB |
Output is correct |
4 |
Correct |
151 ms |
41520 KB |
Output is correct |
5 |
Correct |
165 ms |
41696 KB |
Output is correct |
6 |
Correct |
153 ms |
41580 KB |
Output is correct |
7 |
Correct |
154 ms |
41624 KB |
Output is correct |
8 |
Correct |
130 ms |
41544 KB |
Output is correct |
9 |
Correct |
140 ms |
41772 KB |
Output is correct |
10 |
Incorrect |
13 ms |
31572 KB |
Output isn't correct |
11 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
153 ms |
41036 KB |
Output is correct |
2 |
Correct |
157 ms |
41560 KB |
Output is correct |
3 |
Correct |
161 ms |
41576 KB |
Output is correct |
4 |
Correct |
151 ms |
41520 KB |
Output is correct |
5 |
Correct |
165 ms |
41696 KB |
Output is correct |
6 |
Correct |
153 ms |
41580 KB |
Output is correct |
7 |
Correct |
154 ms |
41624 KB |
Output is correct |
8 |
Correct |
130 ms |
41544 KB |
Output is correct |
9 |
Correct |
140 ms |
41772 KB |
Output is correct |
10 |
Incorrect |
13 ms |
31572 KB |
Output isn't correct |
11 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
13 ms |
31572 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
13 ms |
31572 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
153 ms |
41036 KB |
Output is correct |
2 |
Correct |
157 ms |
41560 KB |
Output is correct |
3 |
Correct |
161 ms |
41576 KB |
Output is correct |
4 |
Correct |
151 ms |
41520 KB |
Output is correct |
5 |
Correct |
165 ms |
41696 KB |
Output is correct |
6 |
Correct |
153 ms |
41580 KB |
Output is correct |
7 |
Correct |
154 ms |
41624 KB |
Output is correct |
8 |
Correct |
130 ms |
41544 KB |
Output is correct |
9 |
Correct |
140 ms |
41772 KB |
Output is correct |
10 |
Incorrect |
13 ms |
31572 KB |
Output isn't correct |
11 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
12 ms |
31572 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |