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#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n;
while (cin >> n) {
string s;
cin >> s;
int initial_ones = 0;
for (char c : s) {
if (c == '1') {
initial_ones++;
}
}
if (initial_ones == n) {
cout << n << endl;
continue;
}
int max_gain = 0;
int current_gai...
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