32 lines
469 B
C++
32 lines
469 B
C++
#include<iostream>
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#include<string>
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using namespace std;
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void eraseZero(string &a)
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{
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while(a[0]=='0'&&a.size()>1) a.erase(0,1);
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}
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int main()
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{
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string a,b,c;
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cin>>a>>b;
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int x,j=0,ai,bi;
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for(ai=a.size()-1,bi=b.size()-1;bi>=0;ai--,bi--)
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{
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x=(a[ai]-'0')-(b[bi]-'0')-j;
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if(x<0) j=1,x+=10;
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else j=0;
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c=char('0'+x)+c;
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}
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while(ai>=0)
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{
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x=a[ai]-'0'-j;
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if(x<0) j=1,x+=10;
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else j=0;
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c=char('0'+x)+c;
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ai--;
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}
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eraseZero(c);
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cout<<c<<endl;
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return 0;
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}
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