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add: 230927

This commit is contained in:
Eatswap 2023-09-27 21:15:32 +08:00
parent 9c9e1f4604
commit 40036c20dc
Signed by: Eatswap
GPG Key ID: BE661106A1F3FA0B
1 changed files with 11 additions and 11 deletions
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22
cpp/2308/LC230927.cpp
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@ -6,32 +6,32 @@
#include "defs.h"
std::string LC230927::decodeAtIndex(const std::string& s, int k) {
std::vector<std::tuple<std::string, int, unsigned long long>> col;
std::tuple<int, int, unsigned long long> col[51];
int level = 0;
unsigned long long len = 0;
std::string buf;
int begin = 0, end = 0;
for (char ch : s) {
if (std::isalpha(ch)) {
++len;
buf += ch;
++end;
} else { // num
col.emplace_back(buf, ch ^ 0x30, len *= (ch ^ 0x30));
buf.clear();
col[level++] = {begin, ch ^ 0x30, len *= (ch ^ 0x30)};
begin = end = end + 1;
}
if (len >= k)
break;
}
if (!buf.empty())
col.emplace_back(buf, 1, len);
const int level = col.size();
if (begin < end)
col[level++] = {begin, 1, len};
int ck = k - 1;
for (int i = level - 1; i >= 0; --i) {
const auto prev_len = i ? std::get<2>(col[i - 1]) : 0ULL;
const auto& [c_str, c_dup, cur_len] = col[i];
const auto& [b, c_dup, cur_len] = col[i];
ck %= (cur_len / c_dup);
if (ck >= prev_len)
return {c_str[ck - prev_len]};
return {s[ck - prev_len + b]};
}
return {std::get<0>(col[0])[ck]};
return {s[ck]};
}