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HDU 2767(tarjin)
Problem Description Consider the following exercise, found in a generic linear algebra textbook. Let A be an n × n matrix. Prove that the following statements are equivalent: A is invertible. Ax = b has exactly one solution for every n × 1 matrix b.Proving Equivalences (强连通，缩点)
目录 Proving Equivalences (强连通，缩点) 题目 题意 思路 题解 Proving Equivalences (强连通，缩点) 题目 Consider the following exercise, found in a generic linear algebra textbook. Let A be an n × n matrix. Prove that the following statements are equivalent:Codeforces Round #306 (Div. 2) E. Brackets in Implications（构造）
题目链接：http://codeforces.com/problemset/problem/550/E 题目大意： 给n个数，根据“->”规则构造结果为0的表达式。 题目思路： “->”运算 以下统称 运算 考虑到只有1->0才会出现0,所以n个数最后一定是两大项运算，并且左边为1，右边为0，对于右边又分成一个1