题解 | #合并表记录#

粗暴

readline();
let line;
const obj = {};
while ((line = readline())) {
  const [key, value] = line.split(" ");
  obj[key] = (obj[key] || 0) + +value;
}
const keys = Object.keys(obj);
keys.sort((a, b) => a - b);
keys.forEach((key) => {
  console.log(key + " " + obj[key]);
});