Compilare: user.c: In function ‘main’: user.c:68:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &N); ^ user.c:71:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &h[i][j]); ^ user.c: In function ‘traceBack’: user.c:40:17: warning: ‘next.c’ may be used uninitialized in this function [-Wmaybe-uninitialized] stack[ss++].c = c; ^ user.c:47:8: note: ‘next.c’ was declared here pair next; ^ user.c:39:15: warning: ‘next.l’ may be used uninitialized in this function [-Wmaybe-uninitialized] stack[ss].l = l; ^ user.c:47:8: note: ‘next.l’ was declared here pair next; ^