Submission #236041

#	Time	Username	Problem	Language	Result	Execution time	Memory
236041		caoash	Nivelle (COCI20_nivelle)	C++14	110 / 110	111 ms	10996 KiB

nivelle

#include<bits/stdc++.h>
using namespace std;
int n, lst[27][100002];
string s;
 
int L, R, col;
 
void chk(int st, int dr, int cnt)
{
    if(L == 0)
    {
        L = st;
        R = dr;
        col = cnt;
    }
    else
    {
        long long a = cnt;
        long long b = dr - st + 1;
        long long c = col;
        long long d = R - L + 1;
        if(a * d < b * c)
        {
            L = st;
            R = dr;
            col = cnt;
        }
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 
    cin >> n;
    cin >> s;
    s = ' ' + s;
    for(int i = 1; i <= n; ++i)
    {
        for(int j = 0; j <= 25; ++j)
            lst[j][i] = lst[j][i-1];
        lst[s[i] - 'a'][i] = i;
        vector<int> v;
        for(int j = 0; j <= 25; ++j)
            if(lst[j][i] != 0)
                v.push_back(lst[j][i]);
        v.push_back(0);
        sort(v.begin(), v.end());
        for(int x = v.size() - 1; x > 0; --x)
            chk(v[x - 1] + 1, i, v.size() - x);
    }
    cout << L << " " << R << '\n';
    return 0;
}

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