POJ 2352 star (tree array)

POJ 2352 star (tree array)

 

Language:DefaultStars Time Limit:1000 MS   Memory Limit:65536 K Total Submissions:35318   Accepted:15326 Description Astequalmers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. let the level of a star be an amount of the stars that are not higher and not to the right of the given star. astpolicmers want to know the distribution of the levels of the stars. For example, look at the map shown on the figure above. level of the star number 5 is equal to 3 (it's formed by three stars with a numbers 1, 2 and 4 ). and the levels of the stars numbered by 2 and 4 are 1. at this map there are only one star of the level 0, two stars of the level 1, one star of the level 2, and one star of the level 3. You are to write a program that will count the amounts of the stars of each level on a given map. Input The first line of the input file contains a number of stars N (1 <= N <= 15000 ). the following N lines describe coordinates of stars (two integers X and Y per line separated by a space, 0 <= X, Y <= 32000 ). there can be only one star at one point of the plane. stars are listed in ascending order of Y coordinate. stars with equal Y coordinates are listed in ascending order of X coordinate. Output The output shoshould contain N lines, one number per line. the first line contains amount of stars of the level 0, the second does amount of stars of the level 1 and so on, the last line contains amount of stars of the level N-1. Sample Input 51 15 17 13 35 5 Sample Output 12110 Hint This problem has huge input data, use scanf () instead of cin to read data to avoid time limit exceed. Source Ural Collegiate Programming Contest 1999

 

I found that when x = 0, x + lowbit (x) = 0; therefore, x ++ is required; otherwise, update (0) will lead to an endless loop.

 

 

 

 

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         #define L(x) (x<<1)#define R(x) (x<<1|1)#define MID(x,y) ((x+y)>>1)#define eps 1e-8typedef __int64 ll;#define fre(i,a,b) for(i = a; i 
          
           = a;i--)#define mem(t, v) memset ((t) , v, sizeof(t))#define ssf(n) scanf("%s", n)#define sf(n) scanf("%d", &n)#define sff(a,b) scanf("%d %d", &a, &b)#define sfff(a,b,c) scanf("%d %d %d", &a, &b, &c)#define pf printf#define bug pf("Hi\n")using namespace std;#define INF 0x3f3f3f3f#define N 32005struct stud{ int x,y; bool operator <(const stud b) const { if(x==b.x) return y