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Program to print the longest common substring using C++
In this tutorial, we will be discussing a program to print the longest common substring.
For this we will be given two strings say A and B. We have to print the longest substring common to the two input strings A and B.
For example, if we are given with “HelloWorld” and “world book”. Then the longest common substring, in this case, will be the “world”.
Example
#include <iostream>
#include <stdlib.h>
#include <string.h>
using namespace std;
void print_lstring(char* X, char* Y, int m, int n){
int longest[m + 1][n + 1];
int len = 0;
int row, col;
for (int i = 0; i <= m; i++) {
for (int j = 0; j <= n; j++) {
if (i == 0 || j == 0)
longest[i][j] = 0;
else if (X[i - 1] == Y[j - 1]) {
longest[i][j] = longest[i - 1][j - 1] + 1;
if (len < longest[i][j]) {
len = longest[i][j];
row = i;
col = j;
}
}
else
longest[i][j] = 0;
}
}
if (len == 0) {
cout << "There exists no common substring";
return;
}
char* final_str = (char*)malloc((len + 1) * sizeof(char));
while (longest[row][col] != 0) {
final_str[--len] = X[row - 1];
row--;
col--;
}
cout << final_str;
}
int main(){
char X[] = "helloworld";
char Y[] = "worldbook";
int m = strlen(X);
int n = strlen(Y);
print_lstring(X, Y, m, n);
return 0;
}Output
world
Updated on: 01-Nov-2019
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