Compilare: main.c: In function 'main': main.c:11:71: warning: unused variable 'ok' [-Wunused-variable] int n, m, k, l, c, dist, lin, col, i, lstart, cstart, lend, cend, ok, cc, ccc, nr; ^~ main.c:11:65: warning: variable 'cend' set but not used [-Wunused-but-set-variable] int n, m, k, l, c, dist, lin, col, i, lstart, cstart, lend, cend, ok, cc, ccc, nr; ^~~~ main.c:11:51: warning: variable 'cstart' set but not used [-Wunused-but-set-variable] int n, m, k, l, c, dist, lin, col, i, lstart, cstart, lend, cend, ok, cc, ccc, nr; ^~~~~~ main.c:13:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &m, &k, &dist); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:16:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &lin, &col); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~