leetcode

Solution to some Leetcode problems written in C++
git clone git://git.dimitrijedobrota.com/leetcode.git
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commitbeabc2772b11bea2204a9d1006e8d437a2ad9220
parenta4d91e00773b81c6a7f64a9cbea2e1f7eb89754b
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateSun, 22 Jan 2023 11:46:34 +0100

Dynamic Programming I: Day 2

Diffstat:
MProblems/0070.cpp|+++++
MProblems/0746.cpp|+++++++---

2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/Problems/0070.cpp b/Problems/0070.cpp

@@ -1,3 +1,4 @@

// memorization approach
class Solution {
public:
int climbStairs(int n) {

@@ -8,7 +9,11 @@ public:

return vec[n];
}
}
// optimized, memorize only the previous two values
class Solution {
public:
int climbStairs(int n) {
int first = 1, second = 1;
for (int i = 2; i <= n; i++) {

diff --git a/Problems/0746.cpp b/Problems/0746.cpp

@@ -1,3 +1,4 @@

// memorization approach
class Solution {
public:
int minCostClimbingStairs(vector<int> &cost) {

@@ -6,14 +7,17 @@ public:

vec[i] = min(vec[i - 1] + cost[i - 1], vec[i - 2] + cost[i - 2]);
return vec[cost.size()];
}
};
// optimized, memorize only the previous two values
class Solution {
public:
int minCostClimbingStairs(vector<int> &cost) {
int first = cost[0], second = cost[1];
if (cost.size() <= 2) return min(first, second);
for (int i = 2; i < cost.size(); i++) {
int cur = cost[i] + min(first, second);
int crnt = cost[i] + min(first, second);
first = second;
second = cur;
second = crnt;
}
return min(first, second);
}