题1:DNA序列 int minChange(string s1, string s2){ int len = s1.size(); int res = 0; int a1 = 0, a2 = 0; for (int i = 0; i < len; i++){ if (s1[i] == 'A') a1++; if (s2[i] == 'A') a2++; } int dif = abs(a1 - a2);//需要修改多少个字符 res += dif; int cur = 0; for (int i = 0; i < len; i++){ if (s...