leetcode

Daily Problem

2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/ Problems/1396.cpp b/ Problems/1396.cpp

@@ -0,0 +1,23 @@

class UndergroundSystem {

unordered_map<int, pair<string, int>> check_in;

unordered_map<string, pair<int, int>> average;

public:

UndergroundSystem() {}

void checkIn(int id, const string &stationName, int t) {

check_in[id] = {stationName, t};

}

void checkOut(int id, const string &stationName, int t) {

auto &[name, time] = check_in[id];

auto &p = average[name + "-" + stationName];

p.second += t - time;

p.first++;

}

double getAverageTime(const string &startStation, const string &endStation) {

auto &p = average[startStation + "-" + endStation];

return (double)p.second / p.first;

}

};

diff --git a/ README.md b/ README.md

@@ -566,3 +566,4 @@ for solving problems. | 2666 | Easy | [Allow One Function Call](Problems/2666.js) | | 2667 | Easy | [Create Hello World Function](Problems/2667.js) | | 2676 | Medium | [Throttle](Problems/2676.js) |

| 1396 | Medium | [Design Underground System](Problems/1396.cpp) |