Codeforces Gym 101158E Infallibly Crack Perplexing Cryptarithm Gym [语法分析]
题意:判断给定串可以写成多少种二进制等式且成立的形式。题解:利用暴力+语法分析解题。AC代码:#includeusingnamespacestd;#defineResultpair#defineFAILmake_pair((char*)NULL,0)charsrcExpr[32],expr[32],op[8]={'0','1','+','-','*','(',')','='};structPars