输入格式：
输出格式：
输入样例：
2 1 2.4 0 3.2 2 2 1.5 1 0.5
输出样例：
3 2 1.5 1 2.9 0 3.2代码
a_dict, b_dict, c_dict ={}, {}, {} # 创建字典
# 读取输入
a = list(map(float,input().split()))
b = list(map(float,input().split()))
# print(a)
# print(b)
#位置供参考
# 0 1 2 3
#-4 -3 -2 -1
# 1 2.4 0 3.2
dishu = -1
for i in range(int(a[0])):
xishu = dishu - 1
if a_dict.get(xishu,0) == 0: # 如果没有对应的系数就给它赋值，有就加上
a_dict[int(a[xishu])] = a[dishu]
else:
a_dict[int(a[xishu])] += a[dishu]
dishu = xishu - 1
# print(a_dict)
dishu = -1
for i in range(int(b[0])):
xishu = dishu - 1
if b_dict.get(xishu,0) == 0:# b也同理
b_dict[int(b[xishu])] = b[dishu]
else:
b_dict[int(b[xishu])] += b[dishu]
dishu = xishu - 1
# print(b_dict)
for i in range(max(max(a_dict.keys()),max(b_dict.keys()))+1):# 确定下最高系数
if a_dict.get(i,0) or b_dict.get(i,0):
c_dict[i] = round(a_dict.get(i,0) + b_dict.get(i,0),1)
if c_dict.get(i) == 0: # 如果加起来是0就去掉
del c_dict[i]
# if c_dict[i] == int(c_dict[i]):
# c_dict[i] = int(c_dict[i])
print(len(c_dict),end='')
key_list = sorted(c_dict.keys())
key_list.reverse() # 从最高到最低
# print(key_list)
for i in key_list:
print(' {:} {:}'.format(i,c_dict[i]),end='') # 格式化输出
exit(0)
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