题解 | #合并表记录#

let temp = parseInt(readline());
let map = {};
for(let i = 0; i < temp; i++){
    let line = readline();
    let index = parseInt(line.split(" ")[0]);
    let value = parseInt(line.split(" ")[1]);
    map[index] = map[index] ? map[index] + value : value;
}

for(let i in map){
    console.log(i +　" " + map[i]);
}