题解 | #合并表记录#

a = int(input())
key = []
value = []
result = {}
for i in range(0,a):
    b = str(input())
    c = b.split()
    key.append(int(c[0]))
    value.append(int(c[1]))
for i in range(0, len(key)):
    # 初始进行一下赋值
    if key[i] != '*':
        result[key[i]] = value[i]
    if key[i] == '*':
        continue
    for j in range(i+1, len(key)):
        if key[j] == key[i]:
            result[key[i]] = result[key[i]] + value[j]
            key[j] = '*'
for i in sorted(result.keys()):
    print(f'{i} {result[i]}')