37 lines
1.0 KiB
C++
37 lines
1.0 KiB
C++
#include <string>
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/**
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* 2437. Number of Valid Clock Times
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*
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* You are given a string of length 5 called time, representing the current time on a digital clock in the format "hh:mm". The earliest possible time is "00:00" and the latest possible time is "23:59".
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* In the string time, the digits represented by the ? symbol are unknown, and must be replaced with a digit from 0 to 9.
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* Return an integer answer, the number of valid clock times that can be created by replacing every ? with a digit from 0 to 9.
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*/
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class LC230509CN {
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public:
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static int countTime(const std::string&) noexcept;
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};
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bool match(const char* s, const char* t) {
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for (; *s && *t; ++s, ++t)
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if (*s != *t && *t != '?')
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return false;
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return true;
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}
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int LC230509CN::countTime(const std::string& time) noexcept {
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auto* time_ptr = time.c_str();
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char buf[8];
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int ret = 0;
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for (int h = 0; h < 24; ++h) {
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for (int m = 0; m < 60; ++m) {
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std::sprintf(buf, "%02d:%02d", h, m);
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ret += match(buf, time_ptr);
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}
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}
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return ret;
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}
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using Solution = LC230509CN;
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