统计重复个数
定义由 n 个连接的字符串 s 组成字符串 S,即 S = [s,n]。例如,["abc", 3]="abcabcabc"。
另一方面,如果我们可以从 s2 中删除某些字符使其变为 s1,我们称字符串 s1 可以从字符串 s2 获得。例如,"abc" 可以根据我们的定义从 "abdbec" 获得,但不能从 "acbbe" 获得。
现在给出两个非空字符串 S1 和 S2(每个最多 100 个字符长)和两个整数 0 ≤ N1 ≤ 106 和 1 ≤ N2 ≤ 106。现在考虑字符串 S1 和 S2,其中S1=[s1,n1]和S2=[s2,n2]。找出可以使[S2,M]从 S1 获得的最大整数 M。
示例:
输入:
s1 ="acb",n1 = 4
s2 ="ab",n2 = 2
返回:
2
int getMaxRepetitions(string s1, int
n1, string s2, int
n2)
{
int index = 0, repeat_count = 0;
int s1_size = s1.size(), s2_size = s2.size();
for (int i = 0; i < n1; i++) {
for (int j = 0; j < s1_size; j++) {
if (s1[j] == s2[index])
++index;
if (index == s2_size) {
index = 0;
++repeat_count;
}
}
}
return repeat_count / n2;
}
int getMaxRepetitions(string s1, int
n1, string s2, int
n2)
{
if (n1 == 0)
return 0;
int indexr[s2.size() + 1] = { 0 }; // index at start of each s1 block
int countr[s2.size() + 1] = { 0 }; // count of repititions till the present s1 block
int index = 0, count = 0;
for (int i = 0; i < n1; i++) {
for (int j = 0; j < s1.size(); j++) {
if (s1[j] == s2[index])
++index;
if (index == s2.size()) {
index = 0;
++count;
}
}
countr[i] = count;
indexr[i] = index;
for (int k = 0; k < i; k++) {
if (indexr[k] == index) {
int prev_count = countr[k];
int pattern_count = (countr[i] - countr[k]) * (n1 - 1 - k) / (i - k);
int remain_count = countr[k + (n1 - 1 - k) % (i - k)] - countr[k];
return (prev_count + pattern_count + remain_count) / n2;
}
}
}
return countr[n1 - 1] / n2;
}
原文地址:https://www.cnblogs.com/kexinxin/p/10280225.html