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10 lines
165 B
C++
10 lines
165 B
C++
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#include <cstdio>
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using namespace std;
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int main(void)
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{
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int v,v0;
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while(~scanf("%d %d", &v,&v0))
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printf("%d\n",2 * v - v0);
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return 0;
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}
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