关于#c++#的问题：洛谷P1125[NOIP2008提高组]笨小猴刚开始学，想不明白哪里错了，求解答//P1125#include <iostream>

Question

洛谷P1125[NOIP2008 提高组]
刚开始学，想不明白哪里错了，求解答

//P1125
#include<iostream>
#include<cstring>
using namespace std;
char a[200];
int b = strlen(a);
int sum[26] = {};
int isPrime(int n) {//判断素数
 int isP =1;
 for (int i = 2; i < n; i++) {
  if (n % i == 0) {
   isP = 0;
   break;
  }
  //else
  // isP = 1;
 }
 if (n == 1||n==0)
  isP = 0;
 return isP;
}
int maxn(const char a[200]) {//判断出现次数最多的字母
 int max=0;
 for (int i = 0; i < b; i++) {
  sum[a[i] - 'a']++;
 }
 for (int i = 0; i < 26; i++) {
  if (sum[i] > max)
   max = sum[i];
 }
 return max;
}
int minn(const char a[200]) {//判断出现次数最少的字母
 int min=110;
 for (int i = 0; i < b; i++) {
  sum[a[i] - 'a']++;
 }
 for (int i = 0; i < 26; i++) {
  if (sum[i] < min&&sum[i]>0)
   min = sum[i];
 }
 return min;
}
int main() {
 cin >> a;
 int b = maxn(a) - minn(a);
 //cout << b;
 if (isPrime(b) == 1)
  cout << "Lucky Word" << endl << b;
 else if (isPrime(b) == 0)
  cout << "No Answer" << endl << "0";
 return 0;
}

Answer 1

#include<iostream>  
#include<cstring>  
using namespace std;  
  
char a[200];  
int b = strlen(a);  
int sum[26] = {};  
int isPrime(int n) {//判断素数  
int isP =1;  
for (int i = 2; i < n; i++) {  
  if (n % i == 0) {  
  isP = 0;  
  break;  
  }  
  //else  
  // isP = 1;  
}  
if (n == 1||n==0)  
  isP = 0;  
return isP;  
}  
  
int maxn(const char a[200]) {//判断出现次数最多的字母  
int max=0;  
for (int i = 0; i < b; i++) {  
  sum[a[i] - 'a']++;  
}  
for (int i = 0; i < 26; i++) {  
  if (sum[i] > max)  
  max = sum[i];  
}  
return max;  
}  
  
int minn(const char a[200]) {//判断出现次数最少的字母  
int min=110;  
for (int i = 0; i < b; i++) {  
  sum[a[i] - 'a']++;  
}  
for (int i = 0; i < 26; i++) {  
  if (sum[i] < min&&sum[i]>0)  
  min = sum[i];  
}  
return min;  
}  
  
int main() {  
cin >> a;  
int b = maxn(a) - minn(a);  
//cout << b;  
if (isPrime(b) == 1)  
  cout << "Lucky Word" << endl << b;  
else if (isPrime(b) == 0)  
  cout << "No Answer" << endl << "0";  
else  
  cout << "Invalid Input" << endl << "0";  
return 0;  
}