ADVANCED DATA STRUCTURES PROGRAM • LEVEL 18 — ADVANCED HASHING

Resolve Collisions with Quadratic Probing

Learn how to resolve collisions with quadratic probing using a clear C program.

AdvancedCollision resolutionHash-table design

PROBLEM UNDERSTANDING

Input and expected output

Sample input

No input required

Sample output

0:22 1:33 4:44 9:55

COMPLETE C PROGRAM

Complete C implementation

#include <stdio.h>

int main(void)
{
    int table[11];for(int i=0;i<11;i++)table[i]=-1;int keys[]={22,33,44,55};
    for(int k=0;k<4;k++)for(int step=0;step<11;step++){int slot=(keys[k]%11+step*step)%11;if(table[slot]<0){table[slot]=keys[k];break;}}
    for(int i=0;i<11;i++){if(table[i]>=0)printf("%d:%d ",i,table[i]);}
    putchar('\n');return 0;
}

CURRENT STEP

Select Start to walk through the important lines.

SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

0:22 1:33 4:44 9:55

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
Probe squared offsets from the home slot to reduce primary clustering.
Display the computed result.

Probe squared offsets from the home slot to reduce primary clustering.

EFFICIENCY

Time and space complexity

Time complexity

Average O(1), worst O(n)

Auxiliary space

O(table size)

DEBUGGING CHECKLIST

Common mistakes

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Use the correct format specifier for every variable.

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Initialize variables before using their values.

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Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.