http://acm.uestc.edu.cn/#/problem/show/1296
please help on a graph problem, thanks! I dont know from where to think about it.
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http://acm.uestc.edu.cn/#/problem/show/1296
please help on a graph problem, thanks! I dont know from where to think about it.
Is there anyone play overwatch on codeforces? or Starcraft. Lets' play together before the next codeforces round :D
Hello everyone, I am a student who like to take contests in codeforces. I usaully visit this site before.
However, from last month, I fall in love with a girl. So I have no time to visit codeforces:(((
How are you guys? Have you had a girlfriend like me? Wish you happy coding and high rating:)))) I will go out with her for dinner tonight.
PS: the following is my girlfriend:)))
I upgrated my windows 7 to windows 10. After a month, there is always internet connection problem on windows 10. anyone have the same issue? any solution? However I can't go back to windows7 now:( damn it win10
Hi, today I learned Trie:D and I solved a easy problem. Here is my code on the problem
int const N = 1000002; int const BITS = 31;
int link[N * BITS][2]; int a[N], num[N * BITS];
int main() { int n, k; //read the cutest data:D scanf("%d%d", &n, &k); for(int i=1;i<=n;i++)scanf("%d",&a[i]); for (int i = 1; i <= n; i++) a[i] ^= a[i — 1]; int freak = 2; int root = 1; long long ans = 0; for (int i = 0; i <= n; i++) { int v = root; //get all that less than K :D for (int b = BITS — 1; b >= 0 && v > 0; b--) { int curAi = (a[i] >> b) & 1; int curK = (k >> b) & 1; if (curK == 1) { if (link[v][curAi] > 0) { ans += num[link[v][curAi]]; } } v = link[v][curAi ^ curK]; } v = root;
//insert a[i] to trie:D for (int b = BITS - 1; b >= 0; b--) { num[v]++; int cur = (a[i] >> b) & 1; if (link[v][cur] == 0) { link[v][cur] = freak++; } v = link[v][cur]; } num[v]++;
} //ans get those less than K:D printf("%I64d\n", (long long) n * (n + 1) / 2 — ans); }
That's all. **** I will be back:D
Hello:D
Today I tried to create another account on codeforces (because I have too many downvote on this account, -100 now:D).
However I can't enter in captcha:( what a awful site:D Anyone know how to fix this problem? thanks:D
That's all, I will be back
Hi all,
How to detect odd circle?
Edit:I find how to do it now:D downvote me if you are too stupid to solve this.
Hi all, I have a problem when I want to do conjunction on a union without overflow. My problem is:
(1) let ans = empty
(2) for i from 1 to n do:
How to prove that
?
Edit: now I can prove it:D give me downvote if you are too stupid to solve this problem:D
Hi all, this time we don't have editorial for Codeforces Round #364 because the editorial was eaten.
That's all, wish you high rating.
Hi all, this time we don't have editorial for Codeforces Round #364 because the editorial was eaten.
That's all, wish you high rating.
Hi all,
I have difficulty on a problem on codeforces http://codeforces.net/problemset/problem/691/D
my submission is : http://codeforces.net/contest/691/submission/19308291
I think my idea is right, I used dsu to group several numbers and downsort numbers inside the groups. But I don't know why I am still wrong answer at test21. The idea is simple, but I can't find what's wrong. Anyone please help me, thanks:D
How to find bugs when you think your algorithms and implementation is correct,BTW?
Edit: Bug found:)))
I should calculate p[i]=parent(i) before I use p[i] . I thought it was automatically done by merging, however it is not :DDDD
http://codeforces.net/problemset/problem/698/C
Hi codeforces, though read the tutorial, I still don't understand it. Please anyone explain how to solve it in detail?why we can look backwards? What is the idea?
Btw, what math should I know to understand it?(i can know the dp,bitmask)
Thank you:D
Hi codeforces, I have a great idea:D
when I read others code in codeforces, I always meet some #define term:
#define pb push_back
#define ppb pop_back
#define FOR(i,a,b) for (int _n(b), i(a); i <= _n; i++)
#define FORD(i,a,b) for(int i=(a),_b=(b);i>=_b;i--)
#define all(c) (c).begin(), (c).end()
Can anyone please make a automatic translator to translate the original simplified code into it's full form? So that people who are not familiar with that can read the code more easily :D
Hi, all
I have a problem wich may solved greedily.
Background: Here is a group G of a people, one maybe another's friend. How to select least number of people to be a leader of a subgroup, so that everyone in the group G has a friend as a leader?
Translate: find least number of radial-subgraph of a graph. By radial-subgraph, it means a subgraph which has at least one point which connects all the other point in the subgraph.
Thanks!
Hi, all, I have a great assumption:
the total number of upvotes in codeforces is more than that of the downvotse in codeforce
Thank you:D
Is it a good idea to use scala as a language to use in codeforces and why?
I find the language has its beauty of simplicity and fun, so I am wondering whether it is good enough for practice on codeforces. Thank you for your opinions!
(Btw, I really look forward anwsers from anyone who use or have treid scala in codeforces.) (Please don't downvote it if you think it is a silly question. I am just beginner of this language. Thanks)
Edit — to those who downvote me: You are just a bit of St, no thanks:)
Hi all,
Is it a good idea to use scala as a language to use in codeforces and why?
I find the language has its beauty of simplicity and fun, so I am wondering whether it is good enough for practice on codeforces. Thank you for your opinions!
(Btw, I really look forward anwsers from anyone who use or have treid scala in codeforces.) (Please don't downvote it if you think it is a silly question. I am just beginner of this language. Thanks)
Edit — to those who downvote me: You are just a bit of S
A problems are simple, and I tried to submit once without testing, but I always failed to accept at once. Sometimes I get stuck in very simple mistakes. I feel that programming is so hard because of those mistakes, so I even don't have confidence to think about harder problems with advanced algorithm. Any advice please? Maybe I should change from C to another language? (But sometimes I really enjoy graspping the idea of hard problems. There are so many difficulties and exceptions for me to communicate with my computer.)
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