Eroare de compilare: user.c: In function ‘main’: user.c:115:2: warning: implicit declaration of function ‘frepen’ [-Wimplicit-function-declaration] frepen("std.out", "w", stdout); ^ user.c: In function ‘randomSelect’: user.c:78:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:114:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("std.in", "r", stdin); ^ user.c:117:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &len, &demandedIndex); ^ user.c:123:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &V[i]); ^ /tmp/cckydgCx.o: In function `main': user.c:(.text.startup+0x41): undefined reference to `frepen' collect2: error: ld returned 1 exit status