Submission #714799

#	Time	Username	Problem	Language	Result	Execution time	Memory
714799		aykhn	Boarding Passes (BOI22_passes)	C++14	5 / 100	3 ms	480 KiB

passes

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define OPT ios_base::sync_with_stdio(0); \
            cin.tie(0); \
            cout.tie(0)

#define pii pair<int,int>
#define pll pair<ll,ll>
#define endl "\n"
#define all(v) v.begin(), v.end()
#define mpr make_pair
#define pb push_back
#define ts to_string
#define fi first
#define se second
#define inf 0x3F3F3F3F
#define bpc __builtin_popcount
#define print(v) for(int i = 0; i < v.size(); i++) \
                    cout << v[i] << " "; \
                    cout<<endl;

/*
int ternarySearch(int l, int r, int key, int ar[])
{
    if (r >= l)
    {
        int mid1 = l + (r - l) / 3;
        int mid2 = r - (r - l) / 3;

        if (ar[mid1] == key) {
            return mid1;
        }
        if (ar[mid2] == key) {
            return mid2;
        }
        if (key < ar[mid1]) {
            return ternarySearch(l, mid1 - 1, key, ar);
        }
        else if (key > ar[mid2]) {
            return ternarySearch(mid2 + 1, r, key, ar);
        }
        else {
            return ternarySearch(mid1 + 1, mid2 - 1, key, ar);
        }
    }
    return -1;
}
*/

struct DSU {
	vector<int> e;

	void init(int n)
	{
	    e.assign(n, -1);
	}

	int get(int x)
	{
	    if (e[x] < 0)
            return x;
        return e[x] = get(e[x]);
	}

	bool together(int a, int b)
	{
	    return get(a) == get(b);
    }

	int s(int x)
	{
	    return -e[get(x)];
    }

	bool unite(int x, int y)
	{
		x = get(x);
        y = get(y);

		if (x == y) return false;

		if (e[x] > e[y]) swap(x, y);

		e[x] += e[y];
		e[y] = x;

		return true;
	}
};
int k;
vector<int> key(27, -1);


int main()
{
    string s;
    cin >> s;
    ll n = s.length();
    ll x = n/2;
    ll y = n - x;

    ll t1 = x, t2 = y;
    ll a = t1*(t1-1)/2;
    ll b = t2*(t2-1)/2;
    if ((a + b) % 2 == 0)
        cout << (a + b)/2 << endl;
    else cout << (a + b)/2 << ".5" << endl;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 25
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40