Compilare: main.c: In function 'cmp': main.c:10:12: warning: implicit declaration of function 'strcmp' [-Wimplicit-function-declaration] return strcmp(a[*(int*)x], a[*(int*)y]) >= 0; ^~~~~~ main.c: In function 'main': main.c:15:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("1.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:16:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("1.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:20:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~ main.c:24:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s); ^~~~~~~~~~~~~~~~ main.c:24:9: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized] scanf("%s\n", s); ^~~~~~~~~~~~~~~~