Borderou de evaluare (job #495786)

Eroare de compilare: user.c:6:1: error: unknown type name 'bool' user.c: In function 'backtrack': user.c:11:13: error: 'for' loop initial declarations are only allowed in C99 mode user.c:11:13: note: use option -std=c99 or -std=gnu99 to compile your code user.c:16:9: error: 'for' loop initial declarations are only allowed in C99 mode user.c: In function 'main': user.c:30:5: warning: implicit declaration of function 'pritnf' [-Wimplicit-function-declaration] user.c:26:13: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] user.c:27:13: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] user.c:31:1: warning: control reaches end of non-void function [-Wreturn-type]