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char pairs(char a) { if (a == '}') return '{'; if (a == ']') return '['; if (a == ')') return '('; return 0; } bool isValid(char* s) { int n = strlen( 阅读全文
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. /* 1 = 1; 4 = 1 + 3; 9 = 1 + 3 + 5; 16 = 1 + 3 + 5 + 7; */ 计算过程只需要加减法，效率极高。 bool isPerfectSquare(int num){ if (num == 0 ) return false; int i = 1; w 阅读全文
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bool isAlienSorted(char ** words, int wordsSize, char * order){ if (wordsSize == 1) return true; int i,j,k; for (i=0; i<wordsSize-1; i++) { int len = 阅读全文
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int numWaterBottles(int numBottles, int numExchange){ int total = 0; int spaceBottels = 0; while(numBottles) { total+=numBottles; spaceBottels = numBo 阅读全文
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bool wordPattern(char * pattern, char * str){ char **hash = (char **)malloc(26 * sizeof(char*)); for (int i = 0; i < 26; ++i) { hash[i] = (char*)mallo 阅读全文