LC 983. Minimum Cost For Tickets
In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given as an array days
. Each day is an integer from 1
to 365
.
Train tickets are sold in 3 different ways:
- a 1-day pass is sold for
costs[0]
dollars; - a 7-day pass is sold for
costs[1]
dollars; - a 30-day pass is sold for
costs[2]
dollars.
The passes allow that many days of consecutive travel. For example, if we get a 7-day pass on day 2, then we can travel for 7 days: day 2, 3, 4, 5, 6, 7, and 8.
Return the minimum number of dollars you need to travel every day in the given list of days
.
int mincostTickets(vector<int>& days, vector<int>& costs) {
unordered_set<int> travel(begin(days), end(days));
int dp[] = {};
for (int i = ; i < ; ++i) {
if (travel.find(i) == travel.end()) dp[i] = dp[i - ];
else dp[i] = min({ dp[i - ] + costs[], dp[max(, i - )] + costs[], dp[max(, i - )] + costs[]});
}
return dp[];
}
class Solution {
public:
int mincostTickets(vector<int>& days, vector<int>& costs) {
unordered_set<int> travel(begin(days), end(days));
int dp[] = {};
for (int i = days.front(); i <= days.back(); ++i) {
if (travel.find(i) == travel.end()) dp[i % ] = dp[(i - ) % ];
else dp[i % ] = min({ dp[(i - ) % ] + costs[],
dp[max(, i - ) % ] + costs[], dp[max(, i - ) % ] + costs[] });
}
return dp[days.back() % ];
}
};
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