Submission #707777

#	Time	Username	Problem	Language	Result	Execution time	Memory
707777		TAhmed33	Miners (IOI07_miners)	C++98	45 / 100	1592 ms	524288 KiB

miners

#include <bits/stdc++.h>
using namespace std;
int n;
string s;
int ans (int pos, vector <char> mine1, vector <char> mine2) {
	if (pos == n) {
		return 0;
	}
	mine1.push_back(s[pos]);
	int val = 0;
	map <char, int> ds;
	for (int i = (int)mine1.size() - 1; i >= max(0, (int)mine1.size() - 3); i--) {
		ds[mine1[i]]++;
	}
	int ret = ans(pos + 1, mine1, mine2) + (int)ds.size();
	ds.clear();
	mine1.pop_back();
	mine2.push_back(s[pos]);
	for (int i = (int)mine2.size() - 1; i >= max(0, (int)mine2.size() - 3); i--) {
		ds[mine2[i]]++;
	}
	ret = max(ret, ans(pos + 1, mine1, mine2) + (int)ds.size());
	return ret;
}
int main () {
	cin >> n >> s;
	cout << ans(0, {}, {});
}

Compilation message (stderr)

miners.cpp: In function 'int ans(int, std::vector<char>, std::vector<char>)':
miners.cpp:10:6: warning: unused variable 'val' [-Wunused-variable]
   10 |  int val = 0;
      |      ^~~

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
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