Compilare: user.c: In function ‘ok’: user.c:8:3: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(pkwin, 0, sizeof pkwin); ^ user.c:8:3: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c: In function ‘main’: user.c:56:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] memset(pkme, 0, sizeof pkme); ^ user.c:39:13: warning: unused variable ‘p’ [-Wunused-variable] int n, m, p, i, j, x; ^ user.c:40:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:43:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &ma[i][j]); ^ user.c:48:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x); ^