Compilare: user.c: In function ‘main’: user.c:89:5: warning: implicit declaration of function ‘fputs_unlocked’ [-Wimplicit-function-declaration] fputs_unlocked("-1\n", f); ^ user.c:109:5: warning: implicit declaration of function ‘fputc_unlocked’ [-Wimplicit-function-declaration] fputc_unlocked('\n', f); ^ user.c:55:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &search); ^ user.c:57:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[i]); ^