Compilare: user.c: In function ‘finds’: user.c:13:9: warning: implicit declaration of function ‘strcmp’ [-Wimplicit-function-declaration] if (!strcmp(S[i], s)) return i; ^ user.c:16:5: warning: implicit declaration of function ‘strcpy’ [-Wimplicit-function-declaration] strcpy(S[sn], s); ^ user.c:16:5: warning: incompatible implicit declaration of built-in function ‘strcpy’ [enabled by default] user.c: In function ‘main’: user.c:48:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("afterparty.in", "r", stdin); ^ user.c:49:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("afterparty.out", "w", stdout); ^ user.c:52:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &t); ^ user.c:55:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i", &n, &m); ^ user.c:65:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", tmp); ^ user.c:68:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", tmp); ^