| 020 |
valid parentheses |
python, java |
easy |
stack |
| 021 |
|
java |
easy |
|
| 026 |
remove duplicates from sorted array |
java |
easy |
|
| 069 |
sqrt |
python |
easy |
|
| 100 |
|
java |
easy |
|
| 101 |
|
java |
easy |
|
| 108 |
convert sorted array to bst |
python |
easy |
|
| 110 |
|
java |
easy |
|
| 1146 |
consecutive characters |
python |
easy |
|
| 1260 |
shift 2d grid |
python |
easy |
|
| 1290 |
convert binary linked list to integer |
python |
easy |
|
| 1342 |
steps reduce number to zero |
python |
easy |
|
| 1351 |
count neg numbers in sorted matrix |
python |
easy |
|
| 136 |
|
java |
easy |
|
| 1394 |
find lucky integer |
python |
easy |
|
| 141 |
|
java |
easy |
|
| 1436 |
destination city |
python |
easy |
|
| 1470 |
shuffle the array |
python |
easy |
|
| 1475 |
final prices discount |
python |
easy |
|
| 1480 |
running sum 1d array |
java |
easy |
|
| 1512 |
number good pairs |
python |
easy |
math |
| 1539 |
kth missing positive number |
python |
easy |
|
| 1572 |
matrix diagonal sum |
python |
easy |
|
| 167 |
|
java |
easy |
|
| 190 |
reverse bits |
java |
easy |
|
| 198 |
house robber |
java |
easy |
|
| 204 |
count primes |
python |
easy |
|
| 206 |
reverse linked list |
python, java |
easy |
|
| 226 |
invert binary tree |
python, java |
easy |
|
| 234 |
palindrome linked list |
java |
easy |
|
| 242 |
valid anagram |
python |
easy |
|
| 257 |
binary tree paths |
python |
easy |
dfs |
| 263 |
ugly number |
python |
easy |
|
| 268 |
missing number |
java |
easy |
|
| 278 |
first bad version |
python |
easy |
|
| 283 |
move zeros |
python |
easy |
|
| 344 |
reverse string |
python |
easy |
|
| 35 |
search insert position |
python |
easy |
|
| 389 |
find the difference |
python |
easy |
|
| 392 |
|
java |
easy |
|
| 452 |
|
java |
easy |
|
| 538 |
|
java |
easy |
|
| 572 |
|
java |
easy |
|
| 617 |
|
java |
easy |
|
| 653 |
two sum 4 |
python |
easy |
|
| 669 |
trim a binary search tree |
python |
easy |
binary search tree |
| 700 |
search in bst |
python |
easy |
|
| 733 |
flood fill |
python |
easy |
dfs, bfs |
| 804 |
unique morse code words |
python |
easy |
|
| 819 |
most common word |
python |
easy |
|
| 821 |
shortest distance to character |
python |
easy |
|
| 872 |
|
java |
easy |
|
| 876 |
middle of linked list |
java |
easy |
|
| 896 |
monotonic array |
python |
easy |
|
| 921 |
minimum add make parentheses valid |
python |
easy |
|
| 922 |
sort array by parity 2 |
java |
easy |
|
| 937 |
|
java |
easy |
|
| 942 |
DI string match |
python |
easy |
|
| 965 |
univalued binary tree |
python |
easy |
|
| 003 |
longest substring without repeating characters |
java |
medium |
|
| 005 |
|
java |
medium |
|
| 017 |
letter combinations phone number |
java |
medium |
|
| 022 |
generate parentheses |
java |
medium |
|
| 039 |
combination sum |
java |
medium |
|
| 040 |
combination sum 2 |
java |
medium |
|
| 046 |
permutations |
java |
medium |
|
| 056 |
|
java |
medium |
|
| 063 |
|
java |
medium |
|
| 064 |
|
java |
medium |
|
| 075 |
|
java |
medium |
|
| 077 |
combinations |
java |
medium |
|
| 078 |
subsets |
java |
medium |
|
| 090 |
subsets 2 |
java |
medium |
|
| 094 |
|
java |
medium |
|
| 098 |
validate bst |
java |
medium |
|
| 1011 |
capacity to ship packages |
python |
medium |
|
| 1038 |
bst to greater sum tree |
python |
medium |
dfs, bst |
| 1049 |
last stone weight 2 |
python |
medium |
|
| 1054 |
|
java |
medium |
|
| 1079 |
letter tile possibilities |
python |
medium |
math, permutation, repetition |
| 109 |
convert sorted list to bst |
python, java |
medium |
|
| 113 |
|
java |
medium |
|
| 114 |
|
java |
medium |
|
| 1143 |
|
java |
medium |
|
| 1155 |
|
java |
medium |
|
| 1286 |
iterator combination |
python |
medium |
|
| 1306 |
jum game 3 |
python |
medium |
|
| 137 |
|
java |
medium |
|
| 139 |
word break |
python |
medium |
dp |
| 142 |
|
java |
medium |
|
| 146 |
|
java |
medium |
|
| 1482 |
minimum days to make bouquets |
python |
medium |
|
| 150 |
|
java |
medium |
|
| 1514 |
path with maximum prob |
python |
medium |
graph, dijkstra |
| 1529 |
bulb switcher 4 |
python |
medium |
|
| 1641 |
count sorted vowel |
python |
medium |
|
| 173 |
|
java |
medium |
|
| 2 |
add two numbers |
python |
medium |
|
| 200 |
number islands |
python |
medium |
BFS |
| 207 |
|
java |
medium |
|
| 211 |
|
java |
medium |
|
| 213 |
house robber 2 |
java |
medium |
|
| 215 |
kth largest element in array |
python, java |
medium |
max heap |
| 216 |
combination sum 3 |
java |
medium |
|
| 230 |
|
java |
medium |
|
| 238 |
|
java |
medium |
|
| 240 |
|
java |
medium |
|
| 264 |
ugly number 2 |
python |
medium |
|
| 300 |
longest increasing subsequence |
java |
medium |
|
| 313 |
super ugly number |
python |
medium |
|
| 332 |
coin change |
java |
medium |
|
| 337 |
house robber 3 |
java |
medium |
|
| 338 |
couting bits |
python |
medium |
|
| 343 |
integer break |
python |
medium |
dp |
| 347 |
|
java |
medium |
|
| 438 |
|
java |
medium |
|
| 445 |
add two numbers 2 |
python |
medium |
|
| 450 |
|
java |
medium |
|
| 451 |
sort char by frequency |
python |
medium |
|
| 474 |
ones and zeros |
python |
medium |
|
| 49 |
group anagrams |
python |
medium |
|
| 503 |
next greater element 2 |
python |
medium |
|
| 518 |
coin change 2 |
python, java |
medium |
|
| 542 |
|
java |
medium |
|
| 63 |
unique paths 2 |
python |
medium |
dp |
| 647 |
|
java |
medium |
|
| 692 |
|
java |
medium |
|
| 735 |
|
java |
medium |
|
| 763 |
|
java |
medium |
|
| 767 |
|
java |
medium |
|
| 784 |
letter case permutation |
java |
medium |
|
| 807 |
max increase to keep city skyline |
java |
medium |
|
| 875 |
koko eating bananas |
python |
medium |
|
| 907 |
sum of subarray minimums |
python, java |
medium |
|
| 959 |
regions cut by slashes |
python, java |
medium |
|
| 973 |
k closest points to origin |
python |
medium |
|
| 994 |
rotting oranges |
java |
medium |
|
| 037 |
sudoku solver |
java |
hard |
|
| 051 |
n queens |
java |
hard |
|
| 052 |
n queens 2 |
java |
hard |
|
| 068 |
|
java |
hard |
|
| 072 |
edit distance |
java |
hard |
|
| 076 |
minimum window substring |
java |
hard |
|
| 224 |
|
java |
hard |
|
| 297 |
serialize and deserialize binary tree |
python, java |
hard |
|
| 410 |
split array largest sum |
python |
hard |
|
| 668 |
kth smallest number in multiplication table |
python |
hard |
binary search |
| 719 |
find kth smallest pair distance |
python |
hard |
binary search |
| 84 |
largest rectangle histogram |
python |
hard |
monotonous stack |