Compilare: user.c: In function ‘APMP’: user.c:80:3: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(bun, 0, sizeof bun); ^ user.c:80:3: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c: In function ‘main’: user.c:106:3: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] memset(ult, -1, sizeof ult); ^ user.c:103:7: warning: variable ‘n’ set but not used [-Wunused-but-set-variable] int n, m, i, x, y, z, d = 0, px, py; ^ user.c: In function ‘readch’: user.c:19:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, BUFF, in); ^