10. 找出作弊的人

const readline = require('readline');
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});

let inputs = [];
rl.on('line', (input) => {
    inputs.push(input);
});
rl.on('close', () => {
    let n = parseInt(inputs.shift());
    let arr = [];
    for(let v of inputs) {
        arr.push(v.split(' ').map(Number));
    }
    arr.sort((a,b)=> a[1] - b[1]);
    let minDiff = Infinity;
    let ans = [];
    for(let i=0; i<arr.length-1; i++) {
        let diff = arr[i+1][1] - arr[i][1];
        if (diff < minDiff) {
            minDiff = diff；
            ans = [[arr[i][0], arr[i+1][0]]];
        } else {
            if (diff === minDiff) {
                ans.push([arr[i][0], arr[i+1][0]]);
            }
        }
    }
    ans.sort((a,b)=>a[0]-b[0]);
    for(let v of ans) {
        console.log(v.join(' '));
    }
})