题解 | 字符个数统计
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
#include <string>
#include <unordered_set>
using namespace std;
int main() {
string a;
int count=0;
unordered_set<char> seen;
getline(cin,a);
for(char c:a)
{
if(seen.find(c)==seen.end())
{
seen.insert(c);
count++;
}
}
cout << count;
}
// 64 位输出请用 printf("%lld")
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