题解 | #判断两个IP是否属于同一子网#
判断两个IP是否属于同一子网
https://www.nowcoder.com/practice/34a597ee15eb4fa2b956f4c595f03218
当然要拍照记录啊
# include <iostream>
# include <string>
# include <vector>
using namespace std;
bool realm(int mask[4]) {
int tag = 1, tag1 = 0;
int a[9] = { 128,192,224,240,248,252,254,255,0 };
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 9; j++) {
if (a[j] == mask[i])
tag1 = 1;
}
if (tag == 0 && mask[i] != 0 || tag1 == 0)
return false;
if (mask[i] != 255)
tag = 0;
tag1 = 0;
}
return true;
}
bool realip(int ip[4]) {
for (int i = 0; i < 4; i++) {
if (ip[i] < 0 || ip[i]>255)
return false;
}
return true;
}
int main() {
int mask[4], ip1[4], ip2[4];
char c;
while (cin >> mask[0] >> c >> mask[1] >> c >> mask[2] >> c >> mask[3]) {
int tag = 0;
for (int i = 0; i < 4; i++) {
cin >> ip1[i];
if (i < 3) cin >> c;
}
for (int i = 0; i < 4; i++) {
cin >> ip2[i];
if (i < 3) cin >> c;
}
if (!realm(mask) || !realip(ip1) || !realip(ip2)) {
cout << 1 << endl;
continue;
}
for (int i = 0; i < 4; i++) {
if ((ip1[i] & mask[i]) != (ip2[i] & mask[i]))
tag = 2;
}
cout << tag << endl;
}
return 0;
}
