1002. A+B for Polynomials (25)

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1002. A+B for Polynomials (25)

时间限制

400 ms

内存限制

65536 kB

代码长度限制

16000 B

判题程序

Standard

作者

CHEN, Yue

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 3.2
2 2 1.5 1 0.5

Sample Output

3 2 1.5 1 2.9 0 3.2

第一次写，部分案例通过：

#include<stdio.h>

int main(){
    int k,n;
    double a;
    int i;
    while(scanf("%d",&k)!=EOF){

        double arr[1001];
        int num = 0;
        for(i=0;i<1001;i++){
            arr[i] = 0;
        }
        for(i=0;i<k;i++){
            scanf("%d %lf",&n,&a);
            arr[n] = arr[n]+a;
            num++;
        }
        scanf("%d",&k);
        for(i=0;i<k;i++){
            scanf("%d %lf",&n,&a);
            if(arr[n]==0)
                num++;
            arr[n] = arr[n]+a;
        }

        printf("%d",num);
        for(i=1000;i>=0;i--){
            if(arr[i]!=0)
                printf(" %d %.1lf",i,arr[i]);
        }
        printf("\n");
    }
    return 0;
}

修改如下，num值单独计算，然后空间开辟稍大，通过了：

#include<stdio.h>

int main(){
    int k,n;
    double a;
    int i;
    while(scanf("%d",&k)!=EOF){

        double arr[1004];
        int num = 0;
        for(i=0;i<1004;i++){
            arr[i] = 0;
        }
        for(i=0;i<k;i++){
            scanf("%d %lf",&n,&a);
            arr[n] = arr[n]+a;
        }
        scanf("%d",&k);
        for(i=0;i<k;i++){
            scanf("%d %lf",&n,&a);
            arr[n] = arr[n]+a;
        }
		for(i=1000;i>=0;i--){
            if(arr[i]!=0)
                num++;
        }

        printf("%d",num);
        for(i=1000;i>=0;i--){
            if(arr[i]!=0)
                printf(" %d %.1lf",i,arr[i]);
        }
        printf("\n");
    }
    return 0;
}