Compilare: user.c: In function ‘main’: user.c:6:40: warning: unused variable ‘k’ [-Wunused-variable] int nrlin, nrcol, i, j, ans, r, o, k; ^ user.c:6:37: warning: unused variable ‘o’ [-Wunused-variable] int nrlin, nrcol, i, j, ans, r, o, k; ^ user.c:6:34: warning: unused variable ‘r’ [-Wunused-variable] int nrlin, nrcol, i, j, ans, r, o, k; ^ user.c:6:26: warning: unused variable ‘j’ [-Wunused-variable] int nrlin, nrcol, i, j, ans, r, o, k; ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d ", &nrlin, &nrcol); ^ user.c:12:14: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(&m[i][1], MAXN+3, fin); ^ user.c:55:12: warning: ‘ans’ is used uninitialized in this function [-Wuninitialized] fprintf(fout, "%d\n", ans); ^