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https://git.sb/baoshuo/OI-codes.git
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47 lines
1.0 KiB
C++
47 lines
1.0 KiB
C++
#include <iostream>
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#include <string>
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using std::cin;
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using std::cout;
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using std::endl;
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int main() {
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int t;
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cin >> t;
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while (t--) {
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int n, cnt1 = 0, cnt2 = 0;
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std::string a, b;
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cin >> n >> a >> b;
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for (char c : a) {
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cnt1 += c == '1';
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}
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for (char c : b) {
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cnt2 += c == '1';
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}
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if (cnt1 != cnt2 && n - cnt1 + 1 != cnt2) {
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cout << -1 << endl;
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continue;
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}
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int m0 = 0, m1 = 0;
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for (int i = 0; i < n; i++) {
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if (b[i] == '1') {
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if (a[i] == '0') {
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m0++;
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} else {
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m1++;
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}
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}
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}
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int a1 = (cnt2 - m1) * 2,
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a2 = (cnt2 - m0) * 2 - 1;
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if (cnt1 != cnt2) {
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cout << a2 << endl;
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} else if (n - cnt1 + 1 != cnt2) {
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cout << a1 << endl;
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} else {
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cout << std::min(a1, a2) << endl;
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}
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}
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return 0;
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}
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