답안 #1020602

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1020602	2024-07-12T07:30:32 Z	toan2602	Tree Rotations (POI11_rot)	C++14	63 / 100	183 ms	33616 KB

#include<bits/stdc++.h>

using namespace std;
#define int long long
int n, x, idx = 1, a[300005], bit[200005], subtree[300005];
vector<int> adj[300005];
int RES = 0;
set<int> S;
map<int,int> mp;
void add(int pos, int val) {
	while(pos <= n) {
		bit[pos] += val;
		pos += pos & -pos;
	}
}

int get(int x) {
	if(x <= 0) return 0;
	int res = 0;
	for (; x; x-=x&(-x)) res+=bit[x];
	return res;
}
int range(int l, int r) {return get(r) - get(l-1);}
void build_sub(int u, int par) {
	subtree[u] = 1;
	for (int node: adj[u]) {
		if(node == par) continue;
		build_sub(node, u);
		subtree[u] += subtree[node];
	}
}
void build(int u) {
	cin >> x;
	if(x == 0) {
		int l, r;
		l = idx+1, r = idx+2;
		idx+=2;
		adj[u].push_back(l);
		adj[u].push_back(r);
		build(l);
		build(r);
	}
	else if(adj[u].size() == 0) a[u] = x;
}

pair<int,int> dfs2(int u) {
	pair<int, int> res = {range(a[u]+1,idx), range(1,a[u]-1)};
	if(a[u] == 0) res = {0,0};
	for (int node: adj[u]) {pair<int, int> val = dfs2(node); res.first+=val.first,res.second+=val.second;}
	return res;
}

void upd(int u, int tp) {
	if(adj[u].empty()) add(a[u], tp);
	for (int node: adj[u]) upd(node,tp);
}

void dfs(int u) {
	int mx = 0, p = -1, idx;
	for (int i = 0; i < adj[u].size(); i++) {
		int node = adj[u][i];
		if(mx < subtree[node]) mx = subtree[node], p = node, idx = i;
	}
	if(p == -1) {
		add(a[u],1);
		return;
	}
	if(idx == 1) swap(adj[u][0], adj[u][1]);
	dfs(adj[u][1]);
	upd(adj[u][1], -1);
	dfs(p);
	pair<int, int> val = dfs2(adj[u][1]);
	RES += min(val.first, val.second);
	upd(adj[u][1], 1);
}
void solve() {
	cin >> n;
 	build(1);
	n = idx;
	for (int i = 1; i <= n; i++) if(a[i]) S.insert(a[i]);
	int d = 0;
	for (int i: S) mp[i] = ++d;
	for (int i = 1; i <= n; i++) a[i] = mp[a[i]];
	build_sub(1,-1);
	dfs(1);
	cout << RES;
}

signed main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen("input.inp","r")){
		freopen("input.inp", "r", stdin);
		freopen("output.out", "w", stdout);
	}
	int t = 1;
	// cin >> t;
	while(t--) {
		solve();
	}
}

Compilation message

rot.cpp: In function 'void dfs(long long int)':
rot.cpp:60:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |  for (int i = 0; i < adj[u].size(); i++) {
      |                  ~~^~~~~~~~~~~~~~~
rot.cpp: In function 'int main()':
rot.cpp:92:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |   freopen("input.inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
rot.cpp:93:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |   freopen("output.out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	7516 KB	Output is correct
2	Correct	5 ms	7328 KB	Output is correct
3	Correct	3 ms	7500 KB	Output is correct
4	Correct	3 ms	7516 KB	Output is correct
5	Correct	4 ms	7516 KB	Output is correct

Subtask #2
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	7440 KB	Output is correct
2	Correct	5 ms	7516 KB	Output is correct
3	Correct	4 ms	7376 KB	Output is correct
4	Correct	5 ms	7516 KB	Output is correct

Subtask #3
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	7516 KB	Output is correct
2	Correct	4 ms	7516 KB	Output is correct
3	Correct	6 ms	7516 KB	Output is correct
4	Correct	4 ms	7516 KB	Output is correct

Subtask #4
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	8284 KB	Output is correct
2	Correct	7 ms	8284 KB	Output is correct
3	Correct	6 ms	8284 KB	Output is correct
4	Correct	6 ms	8360 KB	Output is correct

Subtask #5
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	10076 KB	Output is correct
2	Correct	17 ms	9564 KB	Output is correct
3	Correct	54 ms	12888 KB	Output is correct
4	Correct	16 ms	10328 KB	Output is correct

Subtask #6
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	92 ms	16464 KB	Output is correct
2	Correct	51 ms	17240 KB	Output is correct
3	Correct	64 ms	19024 KB	Output is correct
4	Correct	67 ms	19536 KB	Output is correct

Subtask #7
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	92 ms	26936 KB	Output is correct
2	Correct	97 ms	25172 KB	Output is correct
3	Correct	121 ms	23536 KB	Output is correct
4	Correct	89 ms	23684 KB	Output is correct

Subtask #8
0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	183 ms	29220 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #9
0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Runtime error	39 ms	33616 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #10
0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Runtime error	48 ms	31296 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #11
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Runtime error	39 ms	30752 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-