int ch[128]={0};
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
#include <string>
using namespace std;
int main() {
int ch[128] = {0};
char c;
int count = 0;
while (cin >> c) {
ch[c]++;
}
for (int i : ch) {
if (i > 0) {
count++;
}
}
cout << count << endl;
return 0;
}
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