从今天起每天刷1-2题PAT甲级
A1001 A+B Format (20 分)
题目内容
Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).
Input Specification:
Each input file contains one test case. Each case contains a pair of integers a and b where ?106≤a,b≤106. The numbers are separated by a space.
Output Specification:
For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.
Sample Input:
-1000000 9
Sample Output:
-999,991
单词
commas
n. [语] 逗号(comma的复数)
题目分析
输入两个数,计算结果后以标准格式输出,标准格式为每隔三个数字加一个逗号(这里插一句,个人感觉这里说的不太严谨,因为并没有具体说每隔三个数字是从末尾开始还是从开头开始,我一开始以为是从开头算,如2000就是,200,0,但是这题实际上是要从结尾算,2000应该是2,000,而且输入输出样例也无法看出到底是从开头算还是结尾算,导致我一直AC不了很难受)。
如果题目没有像我一样误读的话,这题应该有两种方法,一种是处理数字,结合取余取整运算符慢慢输出,我第一次做时用的是这种方法。第二种是处理字符串,用sprintf把数字转化为字符串,然后从末尾每隔三个插入一个‘,‘,类似于顺序表插入,要分正负情况,因为负数时第一个符号是-。
具体代码
#include #include #define MAXSIZE 20 int main(void) { int a, b; scanf("%d %d", &a, &b); char C[MAXSIZE]; sprintf(C, "%d", a + b); int M = 0; while (C[M] != ‘\0‘)M++; int N = M; if (a + b > 0) { for (int n = 1; (M - 3 * n) > 0; n++) { for (int m = N - 1; m >= M - 3 * n; m--) C[m + 1] = C[m]; C[M - 3 * n] = ‘,‘; N++; } } else { for (int n = 1; (M - 3 * n) > 1; n++) { for (int m = N - 1; m >= M - 3 * n; m--) C[m + 1] = C[m]; C[M - 3 * n] = ‘,‘; N++; } } C[N] = ‘\0‘; printf("%s", C); system("pause"); }
1002 A+B for Polynomials (25 分)
题目内容
Input Specification:
ach 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... NKaNK
where K is the number of nonzero terms in the polynomial, Niand 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 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
单词
polynomial
英 /,p?l?‘n??m??l/ 美 /,pɑl?‘nom??l/
n. 多项式;多词拉丁学名;表示任何多项数之和
adj. 多项的,多词的;多项式的
exponent
英 /?k‘sp??n?nt; ek-/ 美 /?k‘spon?nt/
n. [数] 指数;典型;说明者,说明物
n. 倡导者,鼓吹者,代表者,拥护者
adj. 说明的
coefficient
英 /,k???‘f??(?)nt/ 美 /ko???f???nt/
n. [数] 系数;率;协同因素
adj. 合作的;共同作用的
decimal
英 /‘des?m(?)l/ 美 /‘d?s?ml/
n. 小数
adj. 小数的;十进位的
题目分析
多项式相加,由于指数范围不大,所以可以构造一个数组,用下标代表指数,对应元素为系数,这样的话可以把代码简化非常多。
一开始我用的是一种略笨的方法,做了三个结构体数组,并且默认其指数是以递减的方式输入的,所以一直有两个测试点过不了,现在把错误代码也一并贴出。
具体代码
正确
#include #include #define MAXSIZE 1001 int n; double m[MAXSIZE]; int k=0; int main(void) { scanf("%d", &n); for (int i = 0; i = 0; i--) { if (m[i] != 0) { printf(" %d %.1f",i,m[i]); } } }
错误
#include
#include
#define maxsize 10struct a {
int e;
float c;
};struct a A[maxsize];
struct a B[maxsize];
struct a C[maxsize];int M, N, K ;
int main(void)
{
int M, N;
scanf("%d", &M);
for (int i = 0; i B[q].e)
{
C[K].c = A[p].c;
C[K].e = A[p].e;
K++;
p++;
}
else if (A[p].e == B[q].e)
{
C[K].c = A[p].c + B[q].c;
C[K].e = A[p].e;
K++;
p++;
q++;
}
else if (A[p].e原文地址:https://www.cnblogs.com/z-y-k/p/11517248.html
时间: 2024-10-13 09:16:38