Optimus
BAN USER
@eugene.yarovai and @loler:
how is it:
"we need to check if count[0] is even and if count[i] == count[k-i]".
I agree we need to check if count[i]==count[k-i]; but why to check if it is even or not? whats wrong with it being odd and equal (count[i] == count[k-i]. ??
cwj - you are right.. it depends on considering the fact that p1 and p2 are very intelligent and knows how to choose so as to not let other win (choose 2 to keep it less and once target is less than result*9 (choose 9 to win). or choose 2 9s.. its confusing me - i think we need a mathematician here! :)
- Optimus September 18, 2012typedef struct node {
int data;
struct node* left;
struct node* right;
} Node;
/* return 1 if true - 0 if false - even if one node return false*/
int checkIfBST(Node *head) {
if (head!=NULL) {
if ((head->left && (head->left)->data > head->data) ||
(head->right && (head->right)->data < head->data) ||
!checkIfBST(head->right) ||
!checkIfBST(head->left))
return 0;
}
return 1;
}
I'd rather copy paste the info here:
From gdb backtrace, seems that printf("%s\n", x) is being silently converted into puts(x) which is fine except when x is NULL, where printf shows (null) but puts() segfaults.
Changing the string, or using the return value avoids this "optimization".
Changing the optimization level -O doesn't affect it.
even if rows are 100,000 and cols are 10,000 -> first one is better.. due to cache performance (read above answer: eugene.yarovoi) and also disk performance (disk head) will be better - it will access in increasing order of memory -- rather than going back and forth.. all cols are always placed together : EG: say each data is 4 bytes, subsequent cols addresses will be baseaddr+4,+8+12,+16..-> easier to read... Consider if rows are accessed (in the inner loop) then baseaddr+40,000 bytes +80,000 bytes .. all the way and then again back at baseaddr+40004, +80004,+12004,...
- Optimus September 15, 2012- 0
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gotcha!
- Optimus October 15, 2012