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1159_Sum.cpp
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1159_Sum.cpp
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// Problem#: 1159
// Submission#: 994650
// The source code is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
// URI: http://creativecommons.org/licenses/by-nc-sa/3.0/
// All Copyright reserved by Informatic Lab of Sun Yat-sen University
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
void plu(string & a,string & b)
{
if(a.length() > b.length())
{
string temp = b;
b = a;
a = temp;
}
b = "0" + b;
int la = a.length();
int lb = b.length();
int up = 0;
int down;
while(la > 0 || up != 0)
{
if(la != 0)
{
down = (a[la - 1] - '0' + b[lb - 1] - '0' + up) % 10;
up = (a[la - 1] - '0' + b[lb - 1] - '0' + up) / 10;
b[lb - 1] = down + '0';
la --;
lb --;
}
else
{
down = (b[lb - 1] - '0' + up) % 10;
up = (b[lb - 1] - '0' + up) / 10;
b[lb - 1] = down + '0';
lb --;
}
}
while(b[0] == '0' && b.length() != 1)
{
b.erase(0,1);
}
return;
}
int main()
{
string a,b;
b = "0";
int n;
while(cin >> n)
{
cin >> b;
for(int i = 1;i < n;i ++)
{
cin >> a;
plu(a,b);
}
while(b[0] == '0' && b.length() != 1)
{
b.erase(0,1);
}
cout << b <<endl;
}
return 0;
}