Frederick Chen
d1347b22c0
https://codeforces.com/problemset/problem/1921/B Signed-off-by: Frederick Chen <seventeen@ohdragonboi.cn>
26 lines
460 B
C++
26 lines
460 B
C++
#include<iostream>
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#include<string>
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#include<algorithm>
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using namespace std;
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int t;
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int main()
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{
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cin >> t;
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while(t -- )
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{
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int n;
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cin >> n;
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string s1, s2;
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cin >> s1 >> s2;
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int x = 0, y = 0;
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for(int i = 0; i < n; i ++ )
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{
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if(s1[i] == '1' && s2[i] == '0') x ++ ;
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if(s1[i] == '0' && s2[i] == '1') y ++ ;
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}
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cout << max(x, y) << endl;
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}
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return 0;
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}
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