A.幸运数字Ⅰ
水题。
代码:
1 #include<iostream> 2 #include<cstring> 3 #include<cstdio> 4 #include<cmath> 5 #include<algorithm> 6 #include<cstdlib> 7 using namespace std; 8 char s[60]; 9 int main(){ 10 cin>>s; 11 int len=strlen(s); 12 int num1=0,num2=0; 13 for(int i=0;i<len;i++){ 14 if(s[i]=='4')num1++; 15 if(s[i]=='7')num2++; 16 } 17 if(num1>=num2&&num1!=0)cout<<"4"<<endl; 18 else if(num1<num2)cout<<"7"<<endl; 19 else cout<<"-1"<<endl; 20 }