Submission #540628

#	Time	Username	Problem	Language	Result	Execution time	Memory
540628		Killer2501	Nivelle (COCI20_nivelle)	C++14	110 / 110	36 ms	744 KiB

nivelle

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 2e3+5;
const int M = 1e5+5;
const int mod = 1e9+7;
const ll base = 327;
const ll inf = 1e15+7;
int c[N], d[N], ans, tong, dp[N], h[N];
int n, m, k;
int a[52], b[N];
vector<int> adj[N], vi, gr[N];
void add(int& x, int y)
{
    x += y;
    if(x >= mod)x -= mod;
}
struct BIT
{
    int n;
    vector<ll> fe;
    BIT(){}
    void init(int _n)
    {
        n = _n;
        fe.assign(n+1, 0);
    }
    void add(int id, ll x)
    {
        for(; id <= n; id += id & -id)fe[id] += x;
    }
    void add(int l, int r, ll x)
    {
        add(l, x);
        add(r+1, -x);
    }
    ll get(int id)
    {
        ll res = 0;
        for(; id; id -= id & -id)res += fe[id];
        return res;
    }
}L, R;

void sol()
{
    string s;
    srand((int)(time(0)));
    cin >> n >> s;
    ld res = inf;
    int l = 1, r = 1;
    for(int len = 1; len <= 26; len ++)
    {
        m = 0;
        fill_n(a, 26, 0);
        for(int i = 1, j = 1; i <= n; i ++)
        {
            k = s[i-1]-'a';
            ++a[k];
            if(a[k] == 1)++m;
            while(m > len)
            {
                k = s[j-1]-'a';
                --a[k];
                if(a[k] == 0)--m;
                ++j;
            }
            if(res > m*1.0/(i-j+1))
            {
                res = m*1.0/(i-j+1);
                l = j;
                r = i;
            }
        }
    }
    cout << l <<" "<<r;

}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
    int test = 1;
    //cin >> test;
    while(test -- > 0)sol();
    return 0;
}

Compilation message (stderr)

nivelle.cpp: In function 'int main()':
nivelle.cpp:94:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
nivelle.cpp:95:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 17 / 17
• Subtask 3: 13 / 13
• Subtask 4: 25 / 25
• Subtask 5: 48 / 48