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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#72028 | #5143. Quick Sort | daniel14311531 | RE | 0ms | 0kb | C++14 | 1.9kb | 2023-01-13 18:30:55 | 2023-01-13 18:30:57 |
Judging History
answer
#include <bits/stdc++.h>
#define pb push_back
using namespace std;
typedef long long ll;
const int N = 500010;
int n, a[N], ans;
int mn[N * 4], mx[N * 4];
void pushup(int u) {
mn[u] = min(mn[u * 2], mn[u * 2 + 1]);
mx[u] = max(mx[u * 2], mx[u * 2 + 1]);
}
void build(int u, int l, int r) {
if(l >= r) { mn[u] = mx[u] = a[l]; return ; }
int mid = (l + r) >> 1;
build(u * 2, l, mid), build(u * 2 + 1, mid + 1, r);
pushup(u);
}
void mdy(int u, int l, int r, int x) {
if(l >= r) { mn[u] = mx[u] = a[l]; return ; }
int mid = (l + r) >> 1;
x <= mid ? mdy(u * 2, l, mid, x) : mdy(u * 2 + 1, mid + 1, r, x);
pushup(u);
}
int findl(int u, int l, int r, int L, int R, int w) {
if(mx[u] < w || R < l || L > r) return 0;
if(l >= r) return l;
int mid = (l + r) >> 1;
int res = 0;
if(L <= mid) res = findl(u * 2, l, mid, L, R, w);
if(res) return res;
if(R > mid) res = findl(u * 2 + 1, mid + 1, r, L, R, w);
return res;
}
int findr(int u, int l, int r, int L, int R, int w) {
if(mn[u] > w || R < l || L > r) return 0;
if(l >= r) return l;
int mid = (l + r) >> 1;
int res = 0;
if(R > mid) res = findr(u * 2 + 1, mid + 1, r, L, R, w);
if(res) return res;
if(L <= mid) res = findr(u * 2, l, mid, L, R, w);
return res;
}
void qsort(int l, int r) {
if(l >= r) return ;
int mid = a[(l + r) / 2], pos = (l + r) / 2;
int tl = l - 1, tr = r + 1;
for(;;) {
tl = findl(1, 1, n, tl + 1, pos, mid);
tr = findr(1, 1, n, pos, tr - 1, mid);
assert(tl && tr);
if(tl >= tr) { pos = tl; break; }
swap(a[tl], a[tr]), ++ans;
mdy(1, 1, n, tl), mdy(1, 1, n, tr);
}
qsort(l, pos), qsort(pos + 1, r);
}
void solve() {
scanf("%d", &n), ans = 0;
for(int i = 1; i <= n; i++) scanf("%d", &a[i]);
build(1, 1, n);
qsort(1, n);
printf("%d\n", ans);
}
int main() {
int T; scanf("%d", &T);
for(; T; --T) solve();
return 0;
}
Details
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Test #1:
score: 0
Dangerous Syscalls
input:
3 3 3 2 1 5 2 4 5 3 1 10 7 2 4 6 1 9 10 8 5 3