Detecting Source-Code Plagiarism

File 1                                  File 2
1 if (x == 5)                           1 if (xyz < 2)
2 {                                     2   for (jjj = 0; jjj < i; jjj++)
3    // Loop on j here                  3    {
4   for (j = 0; j < Index; j++)         4      printf("Hello world\n");
5       printf("x = %i", j);            5    }
6 }                                     6 else
7 else                                  7    while (i > 3) i--;
8   while (i < 5) i++;                  8

Figure 5: Semantic sequence matching.