function solution(points, routes) {
    let crack = 0;
    let starts = [];
    let moves = [];
    let movesIndex = [];
    let pointCheck = {}
    for(let i = 0;i<routes.length; i++){
        let move = [];
        let before = [];
        for(let j = 0;j<routes[0].length; j++){
            let point = points[routes[i][j]-1]
            if(j===0){
                let [y,x] = point;
                if(checkCrack(pointCheck,point)) crack++;
                starts.push([y,x])
            }else{
                let dy = point[0] - before[0];
                let dx = point[1] - before[1];
                move.push([dy,dx])
            }
            before = [...point]    
        }
        moves.push(move)
        movesIndex.push(0)
    }
    // console.log(starts)
    // console.log(moves)
    // console.log(crack)
    let flag = true;
    while(flag){
        //한칸씩간다..
        flag = false;
        pointCheck = {}
        for(let i = 0; i<moves.length ; i++){
            //로봇마다..
            if(moves[i].length-1 <movesIndex[i]) {
                movesIndex[i];
                continue;
            }
            flag = true;
            let [dy,dx] = moves[i][movesIndex[i]];
            if(dy===0 && dx===0){
                movesIndex[i]++;
                continue;
            }
            if(dy!==0){
                let unit = dy/Math.abs(dy);
                starts[i][0] += unit;
                moves[i][movesIndex[i]][0] -= unit;
            }else{
                let unit = dx/Math.abs(dx);
                starts[i][1] += unit;
                moves[i][movesIndex[i]][1] -= unit;
            }
            if(checkCrack(pointCheck,starts[i])) crack++;
        }
        // console.log(starts)
        // console.log(moves)
        // console.log(movesIndex)
        // console.log(crack,flag)
        // console.log('---')
    }
    return crack;
}

function checkCrack(dict, point){
    let [y,x] = point;
    let key = `${y}${x}`
    if(dict[key]){
        dict[key]++;
        if(dict[key]===2) return true
    }else{
        dict[key]=1
    }
    return false
}