leetcode/src/s0076_minimum_window_substr...

40 lines
777 B
C++
Raw Permalink Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#include "s0076_minimum_window_substring.hpp"
bool S0076::check() {
for (const auto &p : ori) {
if (cnt[p.first] < p.second) {
return false;
}
}
return true;
}
// 不包含 t 中所有字符r 右移
// 包含 t 中所有字符l 右移
string S0076::minWindow(string s, string t) {
for (const auto &c : t) {
++ori[c];
}
int l = 0, r = -1;
int len = INT_MAX, ansL = -1, ansR = -1;
while (r < int(s.size())) {
if (ori.find(s[++r]) != ori.end()) {
++cnt[s[r]];
}
while (check() && l <= r) {
if (r - l + 1 < len) {
len = r - l + 1;
ansL = l;
}
if (ori.find(s[l]) != ori.end()) {
--cnt[s[l]];
}
++l;
}
}
return ansL == -1 ? string() : s.substr(ansL, len);
}