题解 | 字符个数统计
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
using namespace std;
int main() {
string a;
getline(cin,a);
int b[128] = {0};
int c = 0;
for(int i = 0;i<a.length();i++){
if(b[a[i]]==0){
c += 1;
b[a[i]]=1;
}
}
cout<<c;
}
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