Codeforces 549 H. Degenerate Matrix

http://codeforces.com/problemset/problem/549/H

唉，智商是硬伤T^T

二分答案x，[a-x,a+x] * [d-x,d+x] 和 [b-x,b+x] * [c-x,c+x] 有没有交点。

#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include  using namespace std; #define rep(i,n) for(int i=0; i r1 || l1 > r2) s = mid; else t = mid; } printf("%.9f\n",(s+t)/2); return 0; }

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