解题思路:
注意事项:
参考代码:
#include<bits/stdc++.h> using namespace std; int n; int count_=0; string s; int main(){ cin>>n; //数位和 for(int i=100;i<=999;i++){ s=to_string(i); int i1=s[0]-'0'; int i2=s[1]-'0'; int i3=s[2]-'0'; int sum=i1*2+i2*2+i3; if(sum==n){ cout<<i1<<i2<<i3<<i2<<i1<<endl; count_++; } } for(int i=100;i<=999;i++){ s=to_string(i); int i1=s[0]-'0'; int i2=s[1]-'0'; int i3=s[2]-'0'; int sum=i1*2+i2*2+i3*2; if(sum==n){ cout<<i1<<i2<<i3<<i3<<i2<<i1<<endl; count_++; } } if(count_==0){ cout<<-1; } }
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