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Submission #1003892

# Submission time Handle Problem Language Result Execution time Memory
1003892 2024-06-20T19:41:22 Z vjudge1 Ekoeko (COCI21_ekoeko) C++17
110 / 110
 33 ms 5276 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define all(x) x.begin(),x.end()
const int maxn = 5e5+10;
const int inf = 1e18+10;
const int lim = 2e5;
int bit[lim+10];
void upd(int pos, int val) {
	for(int i = pos; i <= lim; i+= i&-i) {
		bit[i]+= val;
	}
}

int qry(int pos) {
	int val = 0;
	for(int i = pos; i > 0; i-= i&-i) {
		val+= bit[i];
	}
	return val;
}

int32_t main() {
	// #ifndef ONLINE_JUDGE
	// freopen("in.in","r",stdin);
	// freopen("out.out","w",stdout);
	// #endif

	int n;
	cin >> n;
	string s;
	cin >> s;

	map<char,int> cnt;
	for(auto x : s) {
		cnt[x]++;
	}

	string t;
	for(int i = 0; i < 2*n; i++) {
		if(cnt[s[i]] > 0) {
			cnt[s[i]]-= 2;
			t+= s[i];
		}
	}
	map<char,vector<int>> post;
	for(int i = 0; i < t.size(); i++) {
		post[t[i]].pb(i);
	}

	for(auto x : post) {
		reverse(all(post[x.fr]));
	}

	for(auto x : s) {
		cnt[x]++;
	}
	int l = 1;
	int r = n+1;
	vector<int> pos(2*n);

	for(int i = 0; i < 2*n; i++) {
		if(cnt[s[i]] > 0) {
			cnt[s[i]]-= 2;
			pos[i] = l;
			l++;
		}
		else {
			pos[i] = r+post[s[i]].back();
			post[s[i]].pop_back();
		}
	}

	int ans = 0;
	for(int i = 0; i < 2*n; i++) {
		ans+= i-qry(pos[i]);
		upd(pos[i],1);
	}
	cout << ans << endl;
}

Compilation message

Main.cpp: In function 'int32_t main()':
Main.cpp:51:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |  for(int i = 0; i < t.size(); i++) {
      |                 ~~^~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 6 ms 2164 KB Output is correct
3 Correct 8 ms 3620 KB Output is correct
4 Correct 13 ms 5276 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 6 ms 2164 KB Output is correct
3 Correct 8 ms 3620 KB Output is correct
4 Correct 13 ms 5276 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 6 ms 2164 KB Output is correct
3 Correct 8 ms 3620 KB Output is correct
4 Correct 13 ms 5276 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 29 ms 5028 KB Output is correct
7 Correct 29 ms 4828 KB Output is correct
8 Correct 28 ms 4832 KB Output is correct
9 Correct 28 ms 4836 KB Output is correct
10 Correct 28 ms 4716 KB Output is correct
11 Correct 33 ms 4844 KB Output is correct
12 Correct 27 ms 4832 KB Output is correct
13 Correct 28 ms 4800 KB Output is correct
14 Correct 27 ms 4832 KB Output is correct
15 Correct 27 ms 4580 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 444 KB Output is correct
8 Correct 1 ms 440 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct

Subtask #5
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 6 ms 2164 KB Output is correct
3 Correct 8 ms 3620 KB Output is correct
4 Correct 13 ms 5276 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 29 ms 5028 KB Output is correct
11 Correct 29 ms 4828 KB Output is correct
12 Correct 28 ms 4832 KB Output is correct
13 Correct 28 ms 4836 KB Output is correct
14 Correct 28 ms 4716 KB Output is correct
15 Correct 33 ms 4844 KB Output is correct
16 Correct 27 ms 4832 KB Output is correct
17 Correct 28 ms 4800 KB Output is correct
18 Correct 27 ms 4832 KB Output is correct
19 Correct 27 ms 4580 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 444 KB Output is correct
27 Correct 1 ms 440 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 29 ms 4912 KB Output is correct
33 Correct 29 ms 4844 KB Output is correct
34 Correct 29 ms 4844 KB Output is correct
35 Correct 28 ms 4836 KB Output is correct
36 Correct 28 ms 4836 KB Output is correct
37 Correct 29 ms 4748 KB Output is correct
38 Correct 28 ms 4576 KB Output is correct
39 Correct 27 ms 4776 KB Output is correct
40 Correct 27 ms 4516 KB Output is correct
41 Correct 27 ms 4512 KB Output is correct