PAT(Advanced level) 1002 A+B for Polynomials(25)

个人博客题解

This time, you are supposed to find A+B where A and B are two polynomials.

Input

Each input file contains one test case. Each case occupies 2 lines, and each line contains the information of a polynomial:K N1 a_N1 N2 a_N2 ... NK a_NK, where K is the number of nonzero terms in the polynomial, Ni and a_Ni (i=1, 2, ..., K) are the exponents and coefficients, respectively. It is given that 1 <= K <= 10，0 <= NK < ... < N2 < N1 <=1000.

Output

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 3.22 2 1.5 1 0.5

Sample Output

3 2 1.5 1 2.9 0 3.2

题目：求两个多项式相加

直接定义一个数组a[1001]，下标代表指数，存的值代表系数，最后遍历数组输出即可

#include <iostream>using namespace std;double a[1001] = {0};void input(int k){int n;double num;for(int i = 0; i < k; i ++){cin >> n >> num;a[n] += num;}}int main(){int k1, k2;cin >> k1; input(k1);cin >> k2; input(k2);int N = 0;for(int i = 0; i <= 1000; i ++){if(a[i] != 0) N ++;}printf("%d", N);for(int i = 1000; i >= 0; i --){if(a[i] != 0) printf(" %d %.1f", i, a[i]);}return 0;}