PAT Advanced 1002 A+B for Polynomials
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 (,) are the exponents and coefficients, respectively. It is given that 1,0.
Output Specification:
For each test case you should output the sum 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 to 1 decimal place.
Sample Input:
2 1 2.4 0 3.2
2 2 1.5 1 0.5
Sample Output:
3 2 1.5 1 2.9 0 3.2
多项式相加。开辟float数组,以指数为索引存储系数。遍历统计非零系数个数并输出,输出时注意格式。
#include <bits/stdc++.h> using namespace std; float ans[2010],src1[2010],src2[2010]; int main() { int K,tn; float an; cin>>K; for(int i=0;i<K;i++) { cin>>tn>>an; ans[tn]=an; } cin>>K; for(int i=0;i<K;i++) { cin>>tn>>an; ans[tn]+=an; } int cnt=0; for(int i=0;i<2010;i++) { if(ans[i]!=0) cnt++; } cout<<cnt; for(int i=2009;i>=0;i--) if(ans[i]!=0) { cout<<' '<<i<<' '; cout<<fixed<<setprecision(1)<<ans[i]; } cout<<endl; return 0; }