turns-00031.parquet:21855
86067474d0ac51862b09a7e2degenerate_repetitionAbsentFinal dense release
USER
Hi! Write me a code on JavaScript, that will merge different IP-addresses to a CIDR. As example, an array of 127.0.0.1, 127.0.0.2, 127.0.0.3 would be merged to 127.0.0.0/24. The system needs to be really smart and merge IP addresses based on their count. Like, if you have 127.0.0.1 and 127.1.0 - it will be 127.0.0.0/24 and 127.0.1.0/24, not 127.0.0.0/23. But if you have alot of IP addresses like 127.0.0.1, 127.0.0.2, 127.0.0.75, 127.0.0.234, 127.0.1.34, 127.0.1.46 - it will merge it to a one big CIDR, that contains list of this IP address.
ASSISTANT
To achieve merging of IP addresses into CIDR notation with the specified constraints, we can create a JavaScript function that leverages the binary representation of IP addresses for efficient range merging.
Here's an implementation that fulfills your requirements:
```javascript
function ipToBinary(ip) {
return ip.split('.').map(num => parseInt(num).toString(2).padStart(8, '0')).join('');
}
function binaryToIp(binary) {
return binary.match(/.{1,8}/g).map(bin => parseInt(bin, 2)).join('.');
}
function cidrFromRanges(ranges) {
// Take the first and last IP from the range
const firstIpBinary = ipToBinary(ranges[0]);
const lastIpBinary = ipToBinary(ranges[ranges.length - 1]);
let prefixLength = 32; // CIDR prefix length
for (let i = 0; i < 32; i++) {
if (firstIpBinary[i] !== lastIpBinary[i]) {
prefixLength = i;
break;
}
}
return `${binaryToIp(firstIpBinary.slice(0, prefixLength).padEnd(32, '0'))}/${prefixLength}`;
}
function mergeIPAddresses(ips) {
const uniqueIPs = [...new Set(ips.map(ipToBinary))];
uniqueIPs.sort();
const ranges = [];
let currentRange = [uniqueIPs[0]];
for (let i = 1; i < uniqueIPs.length; i++) {
const currentIp = uniqueIPs[i];
const previousIp = uniqueIPs[i - 1];
if (currentIp.startsWith(previousIp.slice(0, -1)) && parseInt(currentIp, 2) - parseInt(previousIp, 2) <= 1) {
currentRange.push(currentIp);
} else {
if (currentRange.length) {
ranges.push(currentRange);
}
currentRange = [currentIp];
}
}
if (currentRange.length) {
ranges.push(currentRange);
}
return ranges.map(range => cidrFromRanges(range));
}
// Example usage:
const ipAddresses = [
"127.0.0.1",
"127.0.0.2",
"127.0.0.75",
"127.0.0.234",
"127.0.1.34",
"127.0.1.46"
];
const cidrs = mergeIPAddresses(ipAddresses);
console.log(cidrs); // Output might include grouped CIDR notations
```
### Explanation:
1. **ipToBinary**: Converts an IP address to its binary representation.
2. **binaryToIp**: Converts a binary string back to the IP address format.
3. **cidrFromRanges**: Calculates the CIDR notation from the start and end of a range of binary IP addresses.
4. **mergeIPAddresses**:
- Accepts an array of IP addresses.
- Converts IPs to a unique set of binary representations and sorts them.
- Checks if the current and previous IPs can be grouped based on shared prefixes, creating ranges.
- Finally, it computes CIDR notations for these ranges and returns them.
### Usage:
You can add IP addresses to the `ipAddresses` array and run the `mergeIPAddresses` function to see the merged CIDR results in the console. You can adjust the logic as needed to fit additional specific merging rules or efficiency improvements.