#include iostream#include iomanipusing namespace std;int main(){double r1,r2;cinr1r2;double r=1/(1/r1+1/r2);coutfixedsetprecision(2)r;return 0;}
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#include iostreamusing namespace std;int main(){int a,b;cinab;//===方法1//coutb" "a;/*===方法2int c=a;a=b;b=c;couta" "b;*///===方法3swap(a,b);couta" "b;return 0;}
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#include iostreamusing namespace std;int main(){int a,b,c;cinabc;couta+b+c;return 0;}
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#include iostream#include iomanipusing namespace std;int main(){double n,m;cinnm;coutfixedsetprecision(2)n-m*0.8;return 0;}
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#include iostreamusing namespace std;int main(){int a,b;cinab;couta+b;return 0;}
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#include iostreamusing namespace std;int main(){int a,b,c;cinabc;cout(a+b)*c;return 0;}
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#include iostreamusing namespace std;int main(){int a,b,c;cinabc;cout(a+b)/c;return 0;}
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#include iostreamusing namespace std;int main(){int a,b;cinab;couta/b" "a%b;return 0;}
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#include iostream#include iomanipusing namespace std;int main(){int a,b;cinab;coutfixedsetprecision(9)1.0*a/b;return 0;}
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#include iostreamusing namespace std;int main(){cout10;return 0;}
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#include iostream#include queueusing namespace std;struct node{char c;node *left,...
#include iostreamusing namespace std;int n,m;long long a[100050];long long l=0,r=...