BestCoder No.14 总结

A题：一个纯物理题，推一下吧。ios 代码：ui #include<cstdio> #include<cstring> #include<iostream> using namespace std; int v,v0; int main() { while(scanf("%d%d",&v,&v0)!=EOF) { printf("%d\n",(v<<1)-v0);

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