leetcode/src/s0076_minimum_window_substring.cpp
2022-11-30 18:20:36 +08:00

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#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);
}