Submission #199515

#	Time	Username	Problem	Language	Result	Execution time	Memory
199515		SamAnd	Nivelle (COCI20_nivelle)	C++17	110 / 110	101 ms	10744 KiB

nivelle

#include <bits/stdc++.h>
using namespace std;
const int N = 100005;

int n;
char a[N];

int u[N][26];

int main()
{
    scanf("%d", &n);
    scanf(" %s", a);
    for (int j = 0; j < 26; ++j)
        u[n][j] = n;
    for (int i = n - 1; i >= 0; --i)
    {
        for (int j = 0; j < 26; ++j)
            u[i][j] = u[i + 1][j];
        u[i][a[i] - 'a'] = i;
    }
    int x = N, y = 1;
    int ansl = -1, ansr = -1;
    for (int l = 0; l < n; ++l)
    {
        sort(u[l], u[l] + 26);
        for (int j = 0; j < 26; ++j)
        {
            int r;
            if (j < 25)
                r = u[l][j + 1] - 1;
            else
                r = n - 1;
            if ((j + 1) * y < x * (r - l + 1))
            {
                x = (j + 1);
                y = (r - l + 1);
                ansl = l;
                ansr = r;
            }
        }
    }
    printf("%d %d\n", ansl + 1, ansr + 1);
    return 0;
}

Compilation message (stderr)

nivelle.cpp: In function 'int main()':
nivelle.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
nivelle.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf(" %s", a);
     ~~~~~^~~~~~~~~~

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