Submission #844578

#	Time	Username	Problem	Language	Result	Execution time	Memory
844578		vjudge1	Nivelle (COCI20_nivelle)	C++17	0 / 110	182 ms	852 KiB

nivelle

#include <bits/stdc++.h>
#define int long long
using namespace std;
int32_t main(){
	int n;cin>>n;
	string str;cin>>str;
	vector<int> ilk(26,-1);
	vector<int> son(26,-1);
	for (int i = 0; i < n; i++){
		if (ilk[str[i]-'a']==-1) ilk[str[i]-'a']=i;
		son[str[i]-'a']=i;
	}
	vector<int> ls;
	vector<int> rs;
	for (int i = 0; i < 26; i++){
		if (son[i]==-1) continue;
		ls.push_back(son[i]+1);
		ls.push_back(ilk[i]);
		rs.push_back(ilk[i]-1);
		rs.push_back(son[i]);
	}
	vector<bool> vis(26,true);
	int frac1 = 1;
	int frac2 = 1;
	sort(ls.begin(), ls.end());
	sort(rs.begin(), rs.end());
	int ansl=0, ansr=0;
	for (int ll = 0; ll < ls.size(); ll++){
		for (int rr = 0; rr < rs.size(); rr++){
			int l = ls[ll];
			int r = rs[rr];
			if (l>r) continue;
			fill(vis.begin(), vis.end(), 0);
			int crr = 0;
			for (int i = l; i <= r; i++){
				if (!vis[str[i]-'a']) crr++;
				vis[str[i]-'a']=true;
			}
			if (crr*frac2<(r-l+1)*frac1){
				frac1=crr;
				frac2=(r-l+1);
				ansl=l;
				ansr=r;
			}
		}
	}
	cout<<ansl+1<<" "<<ansr+1<<endl;
}

Compilation message (stderr)

nivelle.cpp: In function 'int32_t main()':
nivelle.cpp:28:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |  for (int ll = 0; ll < ls.size(); ll++){
      |                   ~~~^~~~~~~~~~~
nivelle.cpp:29:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |   for (int rr = 0; rr < rs.size(); rr++){
      |                    ~~~^~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 17
• Subtask 3: 0 / 13
• Subtask 4: 0 / 25
• Subtask 5: 0 / 48