42. Adding Reversed Numbers
Problem code: ADDREV
The Antique Comedians of Malidinesia prefer comedies to tragedies. Unfortunately, most of the ancient plays are tragedies. Therefore the dramatic advisor of ACM has decided to transfigure some tragedies into comedies. Obviously, this work is very hard because the basic sense of the play must be kept intact, although all the things change to their opposites. For example the numbers: if any number appears in the tragedy, it must be converted to its reversed form before being accepted into the comedy play.
Reversed number is a number written in arabic numerals but the order of digits is reversed. The first digit becomes last and vice versa. For example, if the main hero had 1245 strawberries in the tragedy, he has 5421 of them now. Note that all the leading zeros are omitted. That means if the number ends with a zero, the zero is lost by reversing (e.g. 1200 gives 21). Also note that the reversed number never has any trailing zeros.
ACM needs to calculate with reversed numbers. Your task is to add two reversed numbers and output their reversed sum. Of course, the result is not unique because any particular number is a reversed form of several numbers (e.g. 21 could be 12, 120 or 1200 before reversing). Thus we must assume that no zeros were lost by reversing (e.g. assume that the original number was 12).
Input
The input consists of N cases (equal to about 10000). The first line of the input contains only positive integer N. Then follow the cases. Each case consists of exactly one line with two positive integers separated by space. These are the reversed numbers you are to add.
Output
For each case, print exactly one line containing only one integer - the reversed sum of two reversed numbers. Omit any leading zeros in the output.
Example
Sample input:
3
24 1
4358 754
305 794
Sample output:
34
1998
1
一段时间没写汇编了，使用输入缓冲提高效率。。。
1 ; spoj42.s
2
3 %define L 1024
4
5 section .bss
6 pBuf : resb L
7 pBufN : resd 1
8 pBufI : resd 1
9
10 section .text
11 global _start
12
13 _start :
14 mov dword[pBufN], 0x0
15 mov dword[pBufI], 0x0
16 call inInt
17 CASE :
18 test eax, eax
19 jz EXIT
20 dec eax
21 push eax
22
23 call inIntR
24 push eax
25 call inIntR
26 pop ebx
27 add eax, ebx
28 call outIntLnR
29
30 pop eax
31 jmp CASE
32 EXIT :
33 mov eax, 0x1
34 mov ebx, 0x0
35 int 0x80
36
37 ; in eax
38 inChar :
39 mov eax, [pBufI]
40 mov ebx, [pBufN]
41 cmp eax, ebx
42 jne NOEMPTY
43 mov eax, 0x3
44 mov ebx, 0
45 mov ecx, pBuf
46 mov edx, L
47 int 0x80
48 mov [pBufN], eax
49 mov dword[pBufI], 0
50 xor eax, eax
51 NOEMPTY :
52 mov ebx, eax
53 inc ebx
54 mov [pBufI], ebx
55 add eax, pBuf
56 mov bl, byte[eax]
57 xor eax, eax
58 mov al, bl
59 ret
60
61 ; in eax
62 inInt :
63 xor eax, eax
64 push eax
65 SKIPSPACE :
66 call inChar
67 cmp al, '0'
68 jb SKIPSPACE
69 cmp al, '9'
70 ja SKIPSPACE
71 INDIGIT :
72 mov ebx, eax
73 pop eax
74 mov ecx, 0xA
75 xor edx, edx
76 mul ecx
77 sub ebx, '0'
78 add eax, ebx
79 push eax
80
81 call inChar
82 cmp al, '0'
83 jb INDIGITEND
84 cmp al, '9'
85 ja INDIGITEND
86 jmp INDIGIT
87 INDIGITEND :
88 pop eax
89 ret
90
91 ; in eax
92 inIntR :
93 xor eax, eax
94 push eax
95 mov eax, 0x1
96 push eax
97 SKIPSPACER :
98 call inChar
99 cmp al, '0'
100 jb SKIPSPACER
101 cmp al, '9'
102 ja SKIPSPACER
103 INDIGITR :
104 sub eax, '0'
105 pop ebx
106 xor edx, edx
107 mul ebx
108 pop ecx
109 add eax, ecx
110 push eax
111 mov eax, ebx
112 mov ecx, 0xA
113 xor edx, edx
114 mul ecx
115 push eax
116
117 call inChar
118 cmp al, '0'
119 jb inIntRend
120 cmp al, '9'
121 ja inIntRend
122 jmp INDIGITR
123 inIntRend :
124 pop eax
125 pop eax
126 ret
127
128 ; out eax
129 outIntLnR :
130 push ebp
131 mov ebp, esp
132 sub esp, 100
133 mov ebx, esp
134 ZEROBEG :
135 test eax, eax
136 jz ZEROEND
137 mov ecx, 0xA
138 xor edx, edx
139 div ecx
140 add edx, '0'
141 mov byte[ebx], dl
142 inc ebx
143 jmp ZEROBEG
144 ZEROEND :
145 mov eax, esp
146 ZEROSKIP :
147 mov cl, byte[eax]
148 cmp cl, '0'
149 jnz ZEROSKIPEND
150 inc eax
151 jmp ZEROSKIP
152 ZEROSKIPEND :
153 mov byte[ebx], 0xA
154 inc ebx
155 mov edx, ebx
156 sub edx, eax
157 mov ecx, eax
158 mov eax, 0x4
159 mov ebx, 0x1
160 int 0x80
161
162 mov esp, ebp
163 pop ebp
164 ret
165