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#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
using namespace std;
void Trans(char *str_num1, char *str_num2, char *tempduf1, char *tempduf2) {
int len_num1 = 0, len_num2 = 0, i = 0;
while(str_num1[i] != '\0') { //查看字符串长度
len_num1++;
i++;
}
i = 0;
while(str_num2[i] != '\0') {
len_num2++;
i++;
}
tempduf1[0] = '0';
tempduf2[0] = '0';
if(len_num2 >= len_num1) { //补成相同长度
for(i=1; i <= (len_num2 - len_num1); i++)
tempduf1[i] = '0';
for(i = len_num2 - len_num1 + 1; i <= len_num2; i++)
tempduf1[i] = str_num1[i - (len_num2 - len_num1 + 1)];
for(i = 1; i <= len_num2; i++)
tempduf2[i] = str_num2[i-1];
}
else if(len_num2 < len_num1) {
for (i = 1; i <= (len_num1 - len_num2); i++)
tempduf2[i] = '0';
for(i = len_num1 - len_num2 + 1; i <= len_num1; i++)
tempduf2[i] = str_num2[i - (len_num1 - len_num2 + 1)];
for(i = 1;i <= len_num1; i++)
tempduf1[i] = str_num1[i-1];
}
}
void Add(char *tempduf1, char *tempduf2, char *result) { //加法
char buf1[100001] = {0};
char buf2[100001] = {0};
Trans(tempduf1,tempduf2,buf1,buf2);
strcpy(tempduf1,buf1);
strcpy(tempduf2,buf2);
int i = 0, temp = 0, jinwei = 0, len = 0;
while(tempduf1[i] != '\0') {
len++;
i++;
}
for(i = len-1; i >= 0; i--) {
temp = (int)(tempduf1[i] + tempduf2[i] + jinwei - 96);
if(temp >= 10) {
temp = temp-10;
jinwei = 1;
}
else
jinwei = 0;
result[i] = (char)(temp + 48);
}
}
void ThrowAway_0(char *tempduf) { //去掉多余的0
char buf[100000] = {0};
int n = strlen(tempduf)-1, i = 0;
while(i < n) {
if(tempduf[i] != '0')
break;
else
i++;
}
int Throw = i;
for (i = 0;i <= n-Throw; i++)
buf[i]= tempduf[i + Throw];
strcpy(tempduf, buf);
}
int Compare(char *tempduf1,char *tempduf2) { //减法比较大小
ThrowAway_0(tempduf1);
ThrowAway_0(tempduf2);
char buf1[100001] = {0};
char buf2[100001] = {0};
Trans(tempduf1,tempduf2,buf1,buf2);
memset(tempduf1,0,100001);
memset(tempduf1,0,100001);
strcpy(tempduf1,buf1);
strcpy(tempduf2,buf2);
int ret = 1,count = 0;
while(count < 100001) {
int m = (int)tempduf1[count]-48;
int n = (int)tempduf2[count] - 48;
if(m == n) {
count++;
ret=0;
}
else if (m > n) {
ret = 1;
break;
}
else if(m < n) {
ret = -1;
break;
}
}
return ret;
}
void Sub(char *tempbuf1, char *tempbuf2, char *result) // 大数相减 result = tempbuf1 - tempbuf2
{
ThrowAway_0 (tempbuf1);
ThrowAway_0 (tempbuf2);
memset(result,0,200);
char buf1[100001]={0};
char buf2[100001]={0};
Trans(tempbuf1,tempbuf2,buf1,buf2);
memset(tempbuf1,0,100001);
memset(tempbuf2,0,100001);
strcpy(tempbuf1,buf1);
strcpy(tempbuf2,buf2);
int i=0;
int temp=0;
int jiewei=0;
int len=0;
int ret=1;
while(tempbuf1[i]!='\0') // tempbuf1 和 tempbuf2 的长度相等
{
len++;
i++;
}
ret = Compare(tempbuf1,tempbuf2);
if(ret==1)
{
for(i=len-1;i>=0;i--)
{
temp = (int)tempbuf1[i] - (int)tempbuf2[i] - jiewei;
if (temp>=0)
{
result[i]=(char)(temp+48);
jiewei=0;
}
else if (temp<0)
{
result[i]=(char)(temp+10+48);
jiewei=1;
}
}
ThrowAway_0 (result);
}
else if(ret==0)
{
memset(result,0,100001);
result[0]='0';
}
else if(ret==-1)
{
for(i=len-1;i>=0;i--)
{
temp = (int)tempbuf2[i] - (int)tempbuf1[i] - jiewei;
if (temp>=0)
{
result[i]=(char)(temp+48);
jiewei=0;
}
else if (temp<0)
{
result[i]=(char)(temp+10+48);
jiewei=1;
}
}
ThrowAway_0 (result);
memset(buf1,0,100001);
sprintf(buf1,"-%s",result);
strcpy(result,buf1);
}
}
int main(){
char str1[100001];
char str2[100001];
char result[100001] = {0};
short result_flag = 0;
cin >> str1 >> str2;
if(str1[0 ]== '-' && str2[0] == '-') {
str2[0] = str1[0] = '0';
Add(str1,str2,result);
if(result[1] == '0') {
cout << "-";
for(int i = 2; i < strlen(result); i++) {
int temp = (int)(result[i] - '0');
cout << temp;
}
}
else {
cout << "-";
for(int i = 1; i < strlen(result); i++) {
int temp = (int)(result[i] - '0');
cout << temp;
}
}
}
else if(str1[0] == '-' && str2[0] != '-') {
str1[0] = '0';
int flag = Compare(str1,str2);
Sub(str2,str1,result);
/* if(flag != 0) {
cout << "-";
for(int i = 1; i < strlen(result); i++) {
cout << result[i];
}
}
else
cout << "0";
}*/
cout << result;
}
else if(str1[0] != '-' && str2[0] == '-') {
str2[0] = '0';
Sub(str1, str2, result);
/*for(int i = 1;i < strlen(result); i++) {
cout << "-";
cout << result[i];
}
// cout << result << endl;
}*/
cout << result;
}
else {
Add(str1,str2,result);
if(result[0] == '0') {
for(int i=1; i< strlen(result); i++){
int temp = (int)(result[i] - '0');
cout << temp;
}
}
else
cout << result << endl;
}
return 0;
}
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