#includeiostream#includestringusing namespace std;int a[26]; //表示26个字母int main(){string s;cins;// 统计每个字母出现的次数for(int i0;is.size();i){a[s[i]-a];}int maxx0,minns.size();// 遍历26个字母的计数数组for(int i0;i26;i){if(a[i]0){ // 直接检查计数是否为0continue;}maxxmax(a[i],maxx);minnmin(a[i],minn);}coutmaxx-minnendl;return 0;}