Submission #866186

#	Time	Username	Problem	Language	Result	Execution time	Memory
866186		TAhmed33	Izbori (COCI22_izbori)	C++98	25 / 110	3032 ms	9164 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MAXN = 2e5 + 25;
int arr[MAXN], n;
vector <int> occ[MAXN];
vector <int> d;
struct bit { 
	int tree[2 * MAXN + 25] = {};
	void add (int pos, int val) {
		for  (; pos < 2 * MAXN + 25; pos += pos & (-pos)) tree[pos] += val;
	}
	ll get (int pos) {
		ll sum = 0; for (; pos; pos -= pos & (-pos)) sum += tree[pos];
		return sum;
	}
};
ll solve1 (int x) {
	int a[n + 1] = {}; bit cur;
	for (int i = 1; i <= n; i++) {
		a[i] = -1;
	}
	for (auto i : occ[x]) a[i] = 1;
	cur.add(MAXN, 1); 
	ll ret = 0;
	for (int i = 1; i <= n; i++) {
		a[i] += a[i - 1];
		ret += cur.get(a[i] - 1 + MAXN);
		cur.add(a[i] + MAXN, 1);
	}
	return ret;
}
ll solve2 (int x) {
	return solve1(x);
}
int main () {
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> arr[i];
		d.push_back(arr[i]);
	}
	sort(d.begin(), d.end()); d.resize(unique(d.begin(), d.end()) - d.begin());
	for (int i = 1; i <= n; i++) arr[i] = lower_bound(d.begin(), d.end(), arr[i]) - d.begin();
	for (int i = 1; i <= n; i++) {
		occ[arr[i]].push_back(i);
	}
	ll sum = 0;
	int x = sqrt(n); while (x * x < n) x++; while (x * x > n) x--;
	for (int i = 0; i < n; i++) {
		if (occ[i].size() > x) sum += solve1(i);
		else sum += solve2(i);
	}
	cout << sum << '\n';
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:50:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   50 |   if (occ[i].size() > x) sum += solve1(i);
      |       ~~~~~~~~~~~~~~^~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 70