题解 | #合并表记录#

readline();
let arr = {};
while ((line = readline())) {
  let index = line.split(" ")[0];
  let num = line.split(" ")[1];
  if (num) {
    if (arr[index]) {
      arr[index] = parseInt(arr[index]) + parseInt(num);
    } else {
      arr[index] = parseInt(num);
    }
  }
}
for (let key of Object.keys(arr)) {
  console.log(key + " " + arr[key]);
}