Submission #1244808

#	Time	Username	Problem	Language	Result	Execution time	Memory
1244808		CrabCNH	Nivelle (COCI20_nivelle)	C++20	110 / 110	48 ms	584 KiB

nivelle

#include <bits/stdc++.h>

#define int long long
#define pii pair <int, int>
#define fi first
#define se second

using namespace std;

const int N = 1e5 + 5;
const int inf = 1e18 + 7;

int n, a[N];
map <int, int> mp;
int last[27];
string s;

void sub2 () {
    int bestL = -1, bestR = -1, bestCnt = 26;
    for (int i = 0; i < n; i ++) {
        mp.clear ();
        int cnt = 0;
        for (int j = i; j < n; j ++) {
            if (mp.find (s[j] - 'a') == mp.end ()) {
                mp[s[j] - 'a'] ++;
                cnt ++;
            }
            if (cnt *(bestR - bestL + 1) < bestCnt * (j - i + 1)) {
                bestL = i;
                bestR = j;
                bestCnt = cnt;
                //cout << bestL << " " << bestR << ' ' << bestCnt << '\n';
            }
        }
    }
    cout << bestL + 1 << ' ' << bestR + 1;
}

void subfull () {
    int bestL = -1, bestR = -1, bestCnt = 26;
    vector <int> all (27, -1);
    memset (last, -1, sizeof (last));
    for (int j = 0; j < n; j ++) {
        all.erase (find (all.begin (), all.end (), last[s[j] - 'a']));
        last[s[j] - 'a'] = j;
        all.insert (all.begin (), j);
        for (int cnt = 1; cnt <= 26; cnt ++) {
            int i = all[cnt] + 1;
            if (cnt *(bestR - bestL + 1) < bestCnt * (j - i + 1)) {
                bestL = i;
                bestR = j;
                bestCnt = cnt;
                //cout << bestL << " " << bestR << ' ' << bestCnt << '\n';
            }
        }
    }
    cout << bestL + 1 << ' ' << bestR + 1;
}

signed main () {
    ios_base :: sync_with_stdio (0);
    cin.tie (0);
    cout.tie (0);
    #define task "crab"
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    cin >> n >> s;
    if (n <= 2000) {
        sub2 ();
    }
    else {
        subfull ();
    }
    
}

Compilation message (stderr)

nivelle.cpp: In function 'int main()':
nivelle.cpp:66:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
nivelle.cpp:67:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         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