340213

function solution(video_len, pos, op_start, op_end, commands) {
  let curPos = skipOp(pos, op_start, op_end);
  commands.forEach((command) => {
    if (command === "next") {
      curPos = next(video_len, curPos);
    } else {
      curPos = prev(curPos);
    }
    curPos = skipOp(curPos, op_start, op_end);
  });
  return curPos;
}
 
function formatTime(secStamp) {
  const minute = Math.floor(secStamp / 60).toString();
  const second = (secStamp % 60).toString();
  return [minute.padStart(2, "0"), second.padStart(2, "0")].join(":");
}
 
function getSecStamp(hhmm) {
  const mm = parseInt(hhmm.split(":")[0]);
  const ss = parseInt(hhmm.split(":")[1]);
  return mm * 60 + ss;
}
 
function isInOp(curPos, opStart, opEnd) {
  const posStamp = getSecStamp(curPos);
  const startStamp = getSecStamp(opStart);
  const endStamp = getSecStamp(opEnd);
  return startStamp <= posStamp && posStamp <= endStamp;
}
 
function prev(curPos) {
  let curstamp = getSecStamp(curPos);
  curstamp -= 10;
  if (curstamp < 0) return formatTime(0);
  return formatTime(curstamp);
}
 
function next(videoLen, curPos) {
  const videoTotalStamp = getSecStamp(videoLen);
  let curstamp = getSecStamp(curPos);
  curstamp += 10;
  if (videoTotalStamp < curstamp) return formatTime(videoTotalStamp);
  return formatTime(curstamp);
}
 
function skipOp(curPos, opStart, opEnd) {
  if (isInOp(curPos, opStart, opEnd)) return opEnd;
  return curPos;
}