Submission #1105881

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1105881	2024-10-28T08:33:09 Z	vjudge1	Tree Rotations (POI11_rot)	C++17	100 / 100	236 ms	22352 KB

#include <bits/stdc++.h>
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define REV(i, b, a) for(int i = (b); i >= (a); --i)
#define REP(i, n) for(int i = 0; i < (n); ++i)
#define ll long long
#define fi first
#define se second
#define int long long
using namespace std;
const int N = 2e5 + 5;


int cnt, node;
int n;
int l[2 * N], r[2 * N];
int st[2 * N], ed[2 * N];
int a[N];
struct BIT {
	int tree[N];
	void add(int x, int v){
		while(x <= n){
			tree[x] += v;
			x += x & -x;
		}
	}
	int query(int x){
		int ret = 0;
		while(x) ret += tree[x], x -= x & -x;
		return ret;
	}
} bit;

void read_tree(int v){
	int x; cin >> x;
	st[v] = cnt;
	if(x == 0){
		l[v] = ++node;
		read_tree(node);
		r[v] = ++node;
		read_tree(node);
	}
	else a[cnt++] = x;
	ed[v] = cnt;
}

int dfs(int v){
	if(ed[v] - st[v] == 1){
		bit.add(a[st[v]], 1);
		return 0;
	}
	int ls = ed[l[v]] - st[l[v]];
	int rs = ed[r[v]] - st[r[v]];
	int ans1 = 0, ans2 = 0;
	if(ls < rs){
		ans1 += dfs(l[v]);

		FOR(i, st[l[v]], ed[l[v]] - 1) {
			bit.add(a[i], -1);
		}
		ans1 += dfs(r[v]);
		FOR(i, st[l[v]], ed[l[v]] - 1) {
			ans2 += bit.query(a[i]);
		}
		FOR(i, st[l[v]], ed[l[v]] - 1) {
			bit.add(a[i], 1);
		}
	}
	else {
		ans1 += dfs(r[v]);
		FOR(i, st[r[v]], ed[r[v]] - 1) {
			bit.add(a[i], -1);
		}
		ans1 += dfs(l[v]);
		FOR(i, st[r[v]], ed[r[v]] - 1) {
			ans2 += ls - bit.query(a[i]);
		}
		FOR(i, st[r[v]], ed[r[v]] - 1) {
			bit.add(a[i], 1);
		}
	}
	return ans1 + min(ls * rs - ans2, ans2);
}

void solve(int tc) {
    cin >> n;
    read_tree(0);
    cout << dfs(0) << '\n';
    return;
}

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    int tc = 1;
    // cin >> tc;
    for(int i = 1; i <= tc; ++i) solve(tc);
    return (0);
}

Subtask #1
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	10576 KB	Output is correct
2	Correct	2 ms	10576 KB	Output is correct
3	Correct	2 ms	10576 KB	Output is correct
4	Correct	2 ms	10576 KB	Output is correct
5	Correct	2 ms	10716 KB	Output is correct

Subtask #2
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	10576 KB	Output is correct
2	Correct	2 ms	10576 KB	Output is correct
3	Correct	2 ms	10576 KB	Output is correct
4	Correct	2 ms	10576 KB	Output is correct

Subtask #3
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	10748 KB	Output is correct
2	Correct	2 ms	10576 KB	Output is correct
3	Correct	2 ms	10576 KB	Output is correct
4	Correct	2 ms	10576 KB	Output is correct

Subtask #4
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	10832 KB	Output is correct
2	Correct	3 ms	10576 KB	Output is correct
3	Correct	3 ms	10832 KB	Output is correct
4	Correct	2 ms	10832 KB	Output is correct

Subtask #5
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	13392 KB	Output is correct
2	Correct	5 ms	12880 KB	Output is correct
3	Correct	15 ms	12964 KB	Output is correct
4	Correct	5 ms	13136 KB	Output is correct

Subtask #6
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	22 ms	12880 KB	Output is correct
2	Correct	15 ms	14328 KB	Output is correct
3	Correct	17 ms	14928 KB	Output is correct
4	Correct	17 ms	14672 KB	Output is correct

Subtask #7
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	20 ms	17744 KB	Output is correct
2	Correct	25 ms	17740 KB	Output is correct
3	Correct	33 ms	16200 KB	Output is correct
4	Correct	24 ms	15440 KB	Output is correct

Subtask #8
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	35 ms	15184 KB	Output is correct
2	Correct	32 ms	16208 KB	Output is correct
3	Correct	35 ms	18768 KB	Output is correct
4	Correct	30 ms	18512 KB	Output is correct

Subtask #9
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	143 ms	17992 KB	Output is correct
2	Correct	58 ms	16868 KB	Output is correct
3	Correct	62 ms	17232 KB	Output is correct
4	Correct	74 ms	16632 KB	Output is correct
5	Correct	141 ms	15440 KB	Output is correct

Subtask #10
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	69 ms	16968 KB	Output is correct
2	Correct	69 ms	21328 KB	Output is correct
3	Correct	90 ms	19544 KB	Output is correct
4	Correct	63 ms	22232 KB	Output is correct
5	Correct	179 ms	15944 KB	Output is correct

Subtask #11
10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	80 ms	16476 KB	Output is correct
2	Correct	72 ms	17492 KB	Output is correct
3	Correct	144 ms	15928 KB	Output is correct
4	Correct	93 ms	16720 KB	Output is correct
5	Correct	66 ms	22352 KB	Output is correct
6	Correct	236 ms	15952 KB	Output is correct

Submission #1105881

Compilation message