This time, you are supposed to find A×B where A and B are two polynomials.
Input Specification:
Each input file contains one test case. Each case occupies 2 lines, and each line contains the information of a polynomial:
K N1 aN1 N2 aN2 ... NK aNK
where K is the number of nonzero terms in the polynomial, Ni and aNi (i=1,2,⋯,K) are the exponents and coefficients, respectively. It is given that 1≤K≤10, 0≤NK<⋯<N2<N1≤1000.
Output Specification:
For each test case you should output the product of A and B in one line, with the same format as the input. Notice that there must be NO extra space at the end of each line. Please be accurate up to 1 decimal place.
Sample Input:
2 1 2.4 0 3.2
2 2 1.5 1 0.5
Sample Output:
3 3 3.6 2 6.0 1 1.6
Accepted Code
1 #include<bits/stdc++.h> 2 using namespace std; 3 int n1, n2, a, cnt; 4 double b, arr[1001] = {0.0}, ans[2001] = {0.0}; 5 6 int main() 7 { 8 cin >> n1; 9 for(int i = 0; i < n1; i ++) 10 { 11 cin >> a >> b; 12 arr[a] = b; 13 } 14 cin >> n2; 15 for(int i = 0; i < n2; i ++) 16 { 17 cin >> a >> b; 18 for(int j = 0; j < 1001; j ++) 19 ans[j + a] += arr[j] * b; 20 } 21 for(int i = 0; i <= 2000; i ++) 22 if(ans[i] != 0.0) cnt ++; 23 cout << cnt; 24 for(int i = 2000; i >= 0; i --) 25 if(ans[i] != 0.0) 26 cout << " " << i << " " << fixed << setprecision(1) << ans[i]; 27 return 0; 28 }
标签:case,Product,PAT,arr,int,cin,Polynomials,++,each From: https://www.cnblogs.com/marswithme/p/17181077.html