PATA1002题解

 1 #include<iostream>
 2 #include<cstring>
 3 #include<stdio.h>
 4 using namespace std;
 5 double res[1001];
 6 int main () {
 7     int K, n,loop=2,number = 0;
 8     double a;
 9     while(loop --) {
10         cin >> K;
11         for(int i = 0; i < K; i++) {
12             cin >> n >> a;
13             if(res[n] == 0) number++;
14             res[n] += a;
15             if(res[n] == 0) number--;
16         }
17     }
18     if(number == 0) {cout << number; return 0;}  //注意！末尾不要留空格
19     cout << number << " ";
20     for(int i = 1000; i >= 0; i--) {
21         if(res[i] != 0) {
22             printf("%d %.1f",i,res[i]);
23             number --;
24             if(number != 0) {
25             printf(" ");
26             }
27         }
28     }
29 }