Compilare: main.c: In function 'main': main.c:11:54: warning: unused variable 'second' [-Wunused-variable] int n,m,l,a[100][100], i, j, nr = 1,fi,fj,si,sj, second; ^~~~~~ main.c:13:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &n, &m, &l); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:17:13: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &a[i][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:51:16: warning: 'g' is used uninitialized in this function [-Wuninitialized] fclose(f); fclose(g); ^~~~~~~~~