Practice Problems

Problem of the Day: Integer Square Root — keep your streak alive!

Practice Problems — prefix-sums

#ProblemTopicsDifficulty
363 Clinic Queue prefix-sums 900
93 Static Range Sums prefix-sums 1100
264 Count Evens in a Range prefix-sums 1100
265 Count Negatives in a Range prefix-sums 1100
91 Fair Binary Split strings prefix-sums 1200
94 Equilibrium Index prefix-sums 1200
423 Balanced Prefix strings prefix-sums 1200
266 Range XOR Queries bitwise prefix-sums 1300
672 Count Positives in Range prefix-sums 1300
673 Count Multiples of 3 in Range prefix-sums 1300
675 Count Primes in Range prefix-sums 1300
706 Count Small-Magnitude in Range prefix-sums 1300
708 Count Even-Digit-Sum in Range prefix-sums 1300
758 Count Multiples of 7 prefix-sums 1300
759 Count Perfect Cubes prefix-sums 1300
760 Count Single-Digit Values prefix-sums 1300
784 Count Squarefree in Range prefix-sums 1300
785 Count Multiples of 6 prefix-sums 1300
786 Count Three-Digit Values prefix-sums 1300
787 Count Palindromic Values prefix-sums 1300
95 Zero-Sum Subarrays prefix-sums 1400
324 Product of the Others prefix-sums 1400
467 Stacked Range Additions prefix-sums 1400
468 How Many Intervals Cover X intervals prefix-sums 1400
96 Subarrays Summing to K prefix-sums 1500
97 Sum over All Subarrays math prefix-sums 1500
471 Balanced Stretch prefix-sums 1500
472 Divisible Subarray Sums math prefix-sums 1500
497 Rectangle Sum Queries prefix-sums 1500
473 Range Products, Zeros Included math prefix-sums 1600
522 Is This Slice Sorted prefix-sums 2100
628 Shortest Reaching Subarray (Negatives) prefix-sums deque 2200