题解 | IP地址
#include<bits/stdc++.h>
using namespace std;
int a[4] = {256, 256, 256, 256};
int main(){
//scanf格式化读取即可
while(scanf("%d.%d.%d.%d", a, a+1, a+2, a+3)!=EOF){
bool flag = false;
for(int i=0; i<4; ++i){
if(a[i]<0 || a[i]>255) {
flag = true;
break;
}
a[i] = 256;
}
if(flag) cout<<"No!\n";
else cout<<"Yes!\n";
}
return 0;
}
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