HDU1002:A + B Problem II(两个大正整数和)
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 376617 Accepted Submission(s): 73403
Problem Description
I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B.
Input
The
first line of the input contains an integer T(1<=T<=20) which
means the number of test cases. Then T lines follow, each line consists
of two positive integers, A and B. Notice that the integers are very
large, that means you should not process them by using 32-bit integer.
You may assume the length of each integer will not exceed 1000.
Output
For
each test case, you should output two lines. The first line is "Case
#:", # means the number of the test case. The second line is the an
equation "A + B = Sum", Sum means the result of A + B. Note there are
some spaces int the equation. Output a blank line between two test
cases.
Sample Input
2
1 2
112233445566778899 998877665544332211
Sample Output
Case 1:
1 + 2 = 3
Case 2:
112233445566778899 + 998877665544332211 = 1111111111111111110
题意: 求两个大正整数的和
思路: 模拟加法运算就好(数组)
#include <cstdio> #include <iostream> #include <cstring> #include <algorithm> using namespace std ; #define maxn 2000 char num1[maxn] , num2[maxn] ; int result[maxn] , n1[maxn] , n2[maxn] ; int main() { int t ; scanf("%d" , &t) ; for(int times =1 ; times <= t ; times ++ ) { scanf("%s %s" , num1 , num2) ; printf("Case %d: " , times ) ; printf("%s + %s = " , num1 , num2 ) ; int len1 = strlen(num1) , len2 = strlen(num2) ; int k, i , j ; int len = max(len1 , len2) ; memset(n1 , 0 , sizeof(n1)) ; memset(n2 , 0 , sizeof(n2)) ; for( i=len1-1 , k=0 ; i>=0 ; i--) { n1[k++] = num1[i] -'0' ; } for(i=len2-1 , k=0 ; i>=0 ; i--) { n2[k++] = num2[i] -'0'; } // 模拟加法 int cnt = 0 ; for(int i=0 ; i<len ; i++){ result[i] = (n1[i] + n2[i] + cnt ) % 10 ; cnt = (n1[i] + n2[i] + cnt ) / 10 ; } if(cnt>0) result[len++] = cnt ; int flag = 0 ; for(int i=len-1 ; i>=0 ; i--){ //正数加正数 没必要处理前导 0 (因为不存在......) printf("%d" , result[i]) ; } printf(" ") ; if(times != t) printf(" ") ; } return 0 ; }