题解 | 字符个数统计
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include<bits/stdc++.h> using namespace std; #define IOS ios_base::sync_with_stdio(false);cin.tie(nullptr) #define INF 0x7fffffff #define inf 0x3f3f3f3f #define PII pair<int,int> #define endl '\n' #define int long long #define double long double #define mod 998244353 int read() {char act = 0;int f = 1, x= 0;while (act = getchar(), act < '0' && act != '-');if (act == '-') f = -1, act = getchar();x = act - '0';while (act = getchar(), act >= '0') x = x * 10 + act - '0';return x * f;} void solve(){ string s; getline(cin,s); set<char>st; for(auto i:s){ st.insert(i); } cout<<st.size()<<endl; } signed main() { IOS; int t=1; //cin>>t; while(t--){ solve(); } return 0; }