# dsu csu

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### Tree heuristic merging (DSU on tree)

1234567EDGCintN,sz[sz],son[sz],fc[sz],dep[sz];voidGsintXintf=0) {Sz[x]=1; forESB (x,e,b) {if(b==f)Continue; FC[B]=fc[x]^Vc[e]; DEP[B]=dep[x]+1; GS (B,X); SZ[X]+=Sz[b]; if(Sz[b]>sz[son[x]]) son[x]=b; }}Const ints='v'-'a'+1, inf=1e9;intmd[5555555],CANS,SKIP,CDEP;voidclrintx) {md[fc[x]]=-inf;}voidUpdintx) {Cans=max (cans,md[fc[x]]+dep[x]-cdep*2); for(intI=0; i) cans=max (cans,md[fc[x]^ (12);}voidInsintx) {Md[fc[x]]=Max (md[fc[x]],dep[x]);} Templatevoid(*func) (int) >voidEDTintXintf) {func (x)

### Codeforces 687D Dividing Kingdom II with weighted and set (DSU)

: Path compression, relation[i]=relation[i]^relation[fa[i]], recursive get and root relationship3: Merge root node, relation[i]=relation[u]^relation[v]^1;#include #include#include#include#include#include#includeusing namespacestd;Const intn=5e5+5;intFa[n],relation[n];structedge{intU,v,w,id; BOOL operatorConstEdge AMP;RHS)Const{ returnW>RHS.W; }}p[n];intFindintx) { if(X==fa[x])returnx; intfx=find (fa[x]); RELATION[X]^=Relation[fa[x]]; returnfa[x]=FX;}BOOLUnion (intUintv) { intFx=find (u),

### Hunan multi-school competition (2015.4.6) CSU 1561 ~ 1569 question solution, 2015.4.6csu

Hunan multi-school competition (2015.4.6) CSU 1561 ~ 1569 question solution, 2015.4.6csu A: Click to open the link. CSU 1561 (More) Multiplication Fill in the result of the product of two numbers at each position. Note that the maximum size of this matrix is 1e8, so the array cannot be opened. Simulation questions #include B: Click the open link. CSU 1562 Fun Ho

### CSU 1320 scoop water (catlan number)

1320: scoop watertime limit: 2 sec memory limit: 128 MB Submit: 494 solved: 129 [Submit] [Status] [web board] Description I just bought two water polo a and B today, and the capacity is 1 litre. He plans to use this water polo to play games. First, the supervisor has prepared a water tank with an infinite capacity. At the beginning, the water tank is empty. Then, the water tank A is used to add water to the water tank, and the water tank B is used to scoop out the water tank, when using water

### CSU 1607:do You have the Template? (tree chain split)

to point B.1 A B means that the weight of the edge of article A is changed to B.2 a B 0 C means that each edge of the path from point A to point B becomes C 2 A B 1 C indicates the each edge of the path of point A to B is added CPit point: This problem of the CSU is built with vectors on WA. There is a loophole in the standard code, which is to use ROOT[K].TOC to determine whether to update the left and right child nodes of K in the segment tree.Pro

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### CSU 1160 (binary issue)

CSU 1160Time limit:1000MS Memory Limit:131072KB 64bit IO Format:%lld %llu DescriptionConverts a decimal integer to 16, in the form of 0x, 10~15 is represented by an uppercase letter, a~f.InputOne integer per line x,0OutputEach row outputs a corresponding eight-bit hexadecimal integer, including the leading 0.Sample Input01023Sample Output0x000000000x000003ffThis question is very ingenious, there are many solutions, here is what I wrote at the game:#i

### CSU 1446 modified LCS extension Euclidean

I am dying. I have been doing this question for two days ...... Various amazing mistakes ...... This is also the question of hnu 12831. Question: We will give you two equal-difference series, and calculate the number of common elements in these two series. Each series is given in the following format: n f d (representing the length, first item, and tolerances of each series respectively ). Ideas: First, an intersection of two series is obtained by extending Euclidean, and then the first intersec

### "Analog" CSU 1807 longest ascending subsequence ~ (2016 Hunan province 12th session of the computer Program design contest for university students)

(scanf ("%d", cass); cass;cass--)111 //for (scanf ("%d", cas), cass=1;cass the //while (~scanf ("%s", s))113 while(~SCANF ("%d",N)) the { theaans=0; thex=l=n+1, y=r=0;117 for(i=1; i"%d", A +i);118 for(i=1; i)119 { - if(!a[i])Continue;121 if(ABS (A[I]-I) >1) {Work1 (i); Break;}122 if(a[i]-i==1) X=min (x,i), y=Max (y,i);123 if(a[i]-i==-1) L=min (l,i), r=Max (y,i);124 } the if(iContinue;126 i

### CSU OJ 1804: A Forward-free graph (Dfs backtracking)

[V] =true; - } -Ans = (ans + a[u] * d[v]% MoD)%MoD; theD[u] = (D[v] + d[u])%MoD; - }Wuyi } the - intMain () Wu { - intN, M, U, v; About while(SCANF ("%d%d", n, m)! =EOF) { \$ for(inti =1; I i) { -scanf"%lld%lld", A + I, B +i); - } - init (n); A for(inti =1; I i) { +scanf"%d%d", u, v); the Add_edge (U, v); -++inch[v]; \$ } the for(inti =1; I i) { the if(!inch[i]) {//0 in the degree the DFS (i); the } -

### The distance between CSU 1503 and the arc (question a of Hunan Programming Competition 2014)

. After finding the coordinates of the center, the next question is how to judge whether the link between the point and the center of the center is within the arc of the slice. I also used the situation to discuss it, however, there are still many cases. At the beginning, eight cases were divided, and then compressed to four cases: Determine whether the order of the given points is clockwise or counterclockwise, then determine the direction of the range, and then determine whether the point is i

### CSU 1354 Distinct Subsequences: Calculate the sum (dp) and csusubsequences of different Subsequences.

CSU 1354 Distinct Subsequences: Calculate the sum (dp) and csusubsequences of different Subsequences. Question link: Click the open link Description Give a positive number, count the sum of the distinct subsequence of it, moreover, any subsequence shoshould not contain leading zeroes should t it is zero.For example, if the number is 1022, the answer is 1 + 0 + 2 + 10 + 12 + 22 + 102 + 122 + 1022 = 1293. Input The first line has an integerT, Means th

### Csu 1577: Dice Game, csu1577dicegame

Csu 1577: Dice Game, csu1577dicegame # Include

### CSU 1337 funny copyright Fei Ma Da's theorem (question J in Hunan Programming Competition 2013)

Question link: http://acm.csu.edu.cn/OnlineJudge/problem.php? Id = 1337 Solution Report: although the range of X and Y is 10 ^ 8, if A is greater than 1000, A ^ 3 will be greater than 10 ^ 9, in this way, there is only one 10 * C + 3 on the right of the equal sign, which can only reach 10 ^ 9 orders of magnitude. Therefore, no matter how many X and Y are input, we only need to take the range from 1 to 1000, enumerate a and B, then C can get, and then judge whether the range of C is between x and

### CSU 1225 longest ascending subsequence and records its number

Label: style blog color Io for SP Div on Log 1 For (Int J = 0; j Note that if the height is the same, no matter who is standing in the queue, the two are considered only one situation: As shown in the code above, if the statistics are the same, an error will be reported, but the sample can pass through Len [I] indicates the longest sub-sequence length that can be constructed by the first I object. CNT [I] indicates the number of the maximum length of the largest sequence constructed by the fir

### CSU-1407: Shortest Distance

1.000000000.000000000.707106782.236067981.414213560.00000000Hint Source The Eighth Program Design Competition for Central South University Students /Obtain the coordinates of A and B at the T moment, and then use the distance formula to find the distance between D = A and B. It is a binary equation about T and A is obtained based on known conditions, b, c, Judgment, the simplest way to direct1. Obtain the vertex coordinates, that is,-B/2/. If the number is greater than or equal to 0, calculate

### CSU 1612: Destroy Tunnels strongly connected component Kosaraju algorithm, tunnelskosaraju

CSU 1612: Destroy Tunnels strongly connected component Kosaraju algorithm, tunnelskosarajuLink: zookeeper Http://acm.csu.edu.cn/OnlineJudge/problem.php? Id = 1612 Give A matrix A the size of N * N, B = A ^ 1 + A ^ 2 + A ^ 3 + .... whether non-zero items exist in A ^ n and B. The question can be converted to N vertices numbered 1-N. For any vertices, the question goes through any step to reach u (u is any of all vertices ). In Discrete Mathematics, ma

### CSU 1724 equal distance and (offline + segment tree)

should be from which to start adding, LRT some numbers, and then take the i,i+l ... , look at the last few not taken, and then l this value is RRT inside the beginning, how to ask for this beginning, to record how many values in the LRT node NUM[LRT], and then assume that from the I-Bit and, ((num[lrt]-(i+1))%l+l)%l, This is a description of the last few LRT node is not selected, and then L ((num[lrt]-(i+1)%l+l)%l-1 is in the RRT inside the opening position (position from 0 to L-1), so OK AH;Ma

### "Mathematics" CSU 1810 Reverse (2016 Hunan province 12th session of computer Program design Competition)

- #defineMAX 0x7f7f7f7f to #definePI 3.14159265358979323 + #defineN 100004 - using namespacestd; thetypedefLong LongLL; * intCas,cass; \$ intN,m,lll,ans;Panax Notoginseng LL Aans; - LL E[n],sum[n],l[n],r[n]; the LL A; + CharS[n]; A intMain () the { + #ifndef Online_judge - //freopen ("1.txt", "R", stdin); \$ //freopen ("2.txt", "w", stdout); \$ #endif - inti,j,k; - LL x, y; the //for (scanf ("%d", cass); cass;cass--) - //for (scanf ("%d", cas), cass=1;cassWuyi //while (~scanf ("%s", s)) th

### "Analog" "math" CSU 1803 2016 (2016 Hunan province 12th session of university students computer Program design Competition)

voidWorkintXintc[]) + { A inti; thec[0]=x/ .; + for(i=1; i .); i++) c[i]=c[0]+1; - for(I= (x .)+1;i .; i++) c[i]=c[0]; \$ } \$ intMain () - { - #ifndef Online_judge the //freopen ("1.txt", "R", stdin); - //freopen ("2.txt", "w", stdout);Wuyi #endif the inti,j,k; - Wu //for (scanf ("%d", cass); cass;cass--) - //for (scanf ("%d", cas), cass=1;cass About //while (~scanf ("%s", s+1)) \$ while(~SCANF ("%d",N)) - { -scanf"%d",m); -aans=0; A Work (n,a); + Work (m,b); t

### CSU 1505 Cool word Hunan Province Race tenth session topic

Title Link: http://acm.csu.edu.cn/OnlineJudge/problem.php?id=1505Test instructions: The trick is that the number of occurrences of each letter in a line of characters is different, and the word is cool.Problem-solving ideas: Look at the test instructions, combined with the case, you can understand that only need to count the number of characters in the string in the line.AC Code:#include #include#include#includeusing namespacestd;Const intm= -+5;intN,ans,a[m],b[m];CharS[m];intMain () {intN,ca=1;

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