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); while(ncase--) {scanf ("%d", N); for(inti =1; I i) {scanf ("%d", Player +i); } memset (c,0,sizeof(c)); for(inti =1; I i) {Ll[i]= SUM (Player[i]-1); Add (Player[i],1); } memset (c,0,sizeof(c)); for(inti = n; I >=1; --i) {Rr[i]= SUM (Player[i]-1); Add (Player[i],1); } LL ans=0; for(inti =1; I i) {ans+ = ll[i] * (N-i-rr[i]) + (I-1-Ll[i]) *Rr[i]; } printf ("%lld\n", ans); } return 0;}intLowbit (intx) { returnx (-x);}voidAddintXintu) { while(x MAXN) {C[x]+=u; X+=lowbit (x); }}intSum

reverse order and calculate num2. But here we don't need to open an extra x array, just a C array, and the introduction of array x is just for easy understanding. As can be seen from the above narrative, the calculation prefix and should be treated as "subscript" in the C array a[i .The subject also has a skill: in order to facilitate the management of the number of races when I am a referee, a structure is used to record the number of people who have experience value less than a[i] in the prev

http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=13895#include #include#include#includestring>using namespacestd;Const intMAXA =100000+5;intN;intC[maxa];intSuminti) { intRET =0; while(I >0) {ret+=C[i]; I-= i (-i); } returnret;}voidAddintIintd) { while(I 1) {C[i]+=D; I+ = i (-i); }}intMain () {intT; int*a, *leftless, *rightless; scanf ("%d", u); while(t--) {scanf ("%d", N); A=New int[n]; Leftless=New int[n]; Rightless=New int[n]; for(intI=0; i) {scanf ("%d", A[i]); L

Title Link: https://vjudge.net/problem/UVALive-4329Test instructions: N number, find three number Ai,aj,ak, make iEnumerate AJ, which is the number of smaller than AJ in CJ [1,j], the number of DJs (j,n) smaller than AJ.So the number of J-1-CJ is [1,j] larger than AJ, N-J-DJ is the number of (j,n) larger than AJ.The answer is ∑dj* (J-1-CJ) + (N-J-DJ) *CJYou can get C and D separately with bit in O (NLGN).1#include 2 using namespacestd;3 4typedefLong LongLL;5 Const intMAXN =20020;6 Const intMAXM

Topic Links:pku:http://poj.org/problem?id=3928hdu:http://acm.hdu.edu.cn/showproblem.php?pid=2492DescriptionN (3InputThe first line of the input contains a integer T (1Every test case consists of N + 1 integers. The first integer is N, the number of players. Then N distinct integers a1, A2 ... an follow, indicating the skill rank of all player, in the order of West to east. (1 OutputFor each test case, output a single line contains an integer with the total number of different games.Sample Input1

began to use the method of the melon God to make a line of the tree, in the morning nothing idle look at the tree array method, and then wrote a tree-like arrayTree-like array:#include Segment Tree:#include POJ 3928 Ping Pong tree-shaped array template title

, (0,0,0)) theScreen.blit (Ft_surf, [Screen.get_width ()/2-Ft_surf.get_width ()/2, -]) theTip_text ="Type any key to continue" theTip_font = Pygame.font.Font (None, -) theTip_surf = Tip_font.render (Tip_text,1, (0,0,0)) -Screen.blit (Tip_surf, [Screen.get_width ()/2-Tip_surf.get_width ()/2, $]) the Pygame.display.flip () theKeepon =True the whileKeepon:94key_pressed =pygame.key.get_pressed () the for Event inchPygame.Event.Get(): the if Event. Type = =Pygame. QUIT: the

hdu2492 Ping PongTest instructions: A group of ping-pong enthusiasts live in a straight line, if two people want to play the game need a referee, the referee must be in between the position, the referee's ability must not be greater than the contestant's largest, not less than the smallest contestantThe main puzzle of the white skin: Consider the case of I as a referee if the number of people left than A[i] is c[i], then there are i-c[i]-1 individuals

Ping Pong Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 1352 Accepted: 509 DescriptionN (3InputThe first line of the input contains a integer T (1Every test case consists of N + 1 integers. The first integer is N, the number of players. Then N distinct integers a1, A2 ... an follow, indicating the skill rank of all player, in the order of West to east. (1 OutputFor each test

Link to the question: Ultraviolet A 1428-ping pong There are n table tennis fans living in a street and they often organize competitions. Each person has a different ability value. Each game requires three people. The referee must live between two players and the ability value must also be between players, ask how many matches can be held at most. Solution: Pre-processing Bi and CI are represented in 1 ~ In I, the energy value is smaller than that in

Ping Pong Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 2302 Accepted: 879 DescriptionN (3InputThe first line of the input contains a integer T (1Every test case consists of N + 1 integers. The first integer is N, the number of players. Then N distinct integers a1, A2 ... an follow, indicating the skill rank of all player, in the order of West to east. (1 OutputFor each test

http://poj.org/problem?id=3928Ping Pong Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 2087 Accepted: 798 DescriptionN (3InputThe first line of the input contains a integer T (1Every test case consists of N + 1 integers. The first integer is N, the number of players. Then N distinct integers a1, A2 ... an follow, indicating the skill rank of all player, in the order of West to

http://poj.org/problem?id=3928Ping Pong Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 2087 Accepted: 798 DescriptionN (3InputThe first line of the input contains a integer T (1Every test case consists of N + 1 integers. The first integer is N, the number of players. Then N distinct integers a1, A2 ... an follow, indicating the skill rank of all player, in the order of West to

An example on petition. Spent a lot of time looking for bugs, just learn the tree-like array, this problem add operation should pay attention to the upper limit is not n.#include using namespacestd;#definell Long LongConstll MAXN = 1e5 +Ten; ll C[maxn];ll N;inline ll Lowbit (ll x) {returnX (-x);} ll sum (ll x) {LL ret=0; while(X >0) {ret+ = C[x]; X-=lowbit (x); } returnret;}voidAdd (ll x, ll D) { while(x MAXN) {C[x]+ = D; X + =lowbit (x); }}ll a[maxn];ll R[MAXN], L[MAXN];intMain () {ll t; s

UVA 1428-ping PongTopic linksTest instructions: Given some people, from left to right, each person has a skill value, now to hold the game, must meet the position from left to right 3 people. and the skill value from small to large or from big to small, ask a few forms of organizationIdea: Use a tree-like array to process the number of the left side of each position smaller than it and the number of small on the right. Then the left and right large can also be calculated, then the game played fo

Topic Links:pku:http://poj.org/problem?id=3928hdu:http://acm.hdu.edu.cn/showproblem.php?pid=2492DescriptionN (3InputThe first line of the input contains a integer T (1Every test case consists of N + 1 integers. The first integer is N, the number of players. Then N distinct integers a1, A2 ... an follow, indicating the skill rank of all player, in the order of West to east. (1 OutputFor each test case, output a single line contains an integer with the total number of different games.Sample Input1

The 48th World Championships have ended so far for all Chinese people. Only the men's and women's singles are left, but the two gold medals are determined by the Chinese, which is meaningless to the Chinese. On May Day, Suzhou was overcast and rainy all day, so it was rare to have a sunny day, so we were able to watch all the games. Let's talk about the feeling of five projects. Mixed Doubles, the top four are all Chinese, and this gold medal is the least suspense. This is not surprising.

Evaluation Portal Question: T-group data, N numbers, 3 are selected in order, and the sum of all the number pairs that meet the monotonic increasing or monotonic decreasing conditions is obtained. Sample Input 1 3 1 2 3 Sample output 1Ideas: This is an advanced method of reverse order, because it is not just a reverse order. We can first find all the reverse order pairs based on the conventional practice, but let's think about who is this reverse order? After you create a table, you will find th

https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudgeitemid=8page=show_problem problem=2330Reference: "An introduction to Algorithms Classic Training Guide" Rujia P197The book above is written on the main topic, the problem-solving ideas are written out.I put my own in here.AC Code:1#include 2#include string.h>3 4 #definePeople 200015 #defineVALUE 1000016 7typedefLong LongLL;8 9 intN, A[people], amin[people], amax[people], tree[value];Ten One A intLowbit (intx) { - returnX -x

Ping Pong http://poj.org/problem?id=3928, http://acm.hdu.edu.cn/showproblem.php?pid=2492, http://uva.onlinejudge.org/ index.php?option=com_onlinejudgeitemid=8category=501page=show_problemproblem=4174 Time limit:1000ms Memory limit:65536k Description N (3 Input the first line of the input contains a integer T (1Every test case consists of N + 1 integers. The first integer is N, the number of players. Then N distinct integers a1, A2 ... an follow