Submission #969652

#	Time	Username	Problem	Language	Result	Execution time	Memory
969652		RandomUser	Nivelle (COCI20_nivelle)	C++17	110 / 110	195 ms	1368 KiB

nivelle

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    int n, P=5000, Q=1, l=1, r=1;
    string s;
    cin >> n >> s;

    map<char, vector<int> > mp;
    for(int i=0; i<n; i++) mp[s[i]].push_back(i);
    for(char ch='a'; ch<='z'; ch++) mp[ch].push_back(n);

    for(int i=0; i<n; i++) {
        vector<int> v;
        for(char ch='a'; ch<='z'; ch++) {
            int p = lower_bound(mp[ch].begin(), mp[ch].end(), i) - mp[ch].begin();
            if(mp[ch][p] != n) v.push_back(mp[ch][p]);
        }
        
        sort(v.begin(), v.end());
        if(v.back() != n) v.push_back(n);

        for(int j=0; j<v.size()-1; j++) {
            int A = j + 1, B = v[j+1] - i;
            if(P * B > Q * A) {
                P = A, Q = B;
                l = i, r = v[j+1]-1;
            }
        }
    }

    cout << l+1 << " " << r+1 << '\n';
    return 0;
}

Compilation message (stderr)

nivelle.cpp: In function 'int main()':
nivelle.cpp:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         for(int j=0; j<v.size()-1; j++) {
      |                      ~^~~~~~~~~~~

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