이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
int shipment2(char s1, char s2) {
return 1 + (s1 != s2);
}
int shipment3(char s1, char s2, char s3) {
if (s1 == s2 && s2 == s3) return 1;
return (s1 != s2) + (s2 != s3) + (s3 != s1);
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int n; string s; cin >> n >> s;
int ans = 0;
for (int mask = 0; mask < (1 << n)-1; mask++) {
string mine1, mine2;
for (int i = 0; i < n; i++) {
if (mask & (1 << i)) mine1 += s[i];
else mine2 += s[i];
}
int l1 = mine1.size(), l2 = mine2.size();
int sum = 0;
if (l1 > 1) sum += 1 + shipment2(mine1[0], mine1[1]);
else if (l1 == 1) sum += 1;
if (l2 > 1) sum += 1 + shipment2(mine2[0], mine2[1]);
else if (l2 == 1) sum += 1;
for (int i = 2; i < l1; i++) {
sum += shipment3(mine1[i], mine1[i-1], mine1[i-2]);
}
for (int i = 2; i < l2; i++) {
sum += shipment3(mine2[i], mine2[i-1], mine2[i-2]);
}
ans = max(ans, sum);
}
cout << ans;
}
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