17 lines
207 B
C++
17 lines
207 B
C++
#include<cstdio>
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using namespace std;
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int abs(int n)
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{
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if(n<0) n=-n;
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return n;
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}
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int main()
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{
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int x,y;
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scanf("%d%d",&x,&y);
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if(abs(x)<=1&&abs(y)<=1) printf("yes\n");
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else printf("no\n");
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return 0;
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}
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