Zoj-1610-Count the Colors-line segment tree-region update, single point Query

Source: Internet
Author: User

The region of the Line Segment tree is updated, and then spof queries are performed.

X1 x2 c: Region update x1-x2 is c.

After all the colors are colored, the color of each vertex is queried from 0. Each color is stored in several pieces.

     using namespace std;#define lmin 0#define rmax 8000#define lson l,(l+r)/2,rt<<1#define rson (l+r)/2+1,r,rt<<1|1#define root lmin,rmax,1#define maxn 10000int cl[maxn*4];int num[maxn];void push_up(int rt){}void push_down(int rt){    if(cl[rt]!=-1)    {        cl[rt<<1]=cl[rt];        cl[rt<<1|1]=cl[rt];        cl[rt]=-1;    }}void update(int ll,int rr,int x,int l,int r,int rt){    if(l>rr||r
      =r)    {      //  cout<
       st)return 0; if(l==r&&st==l)return cl[rt]; if(l<=st&&r>=st&&cl[rt]!=-1)return cl[rt]; return query(st,lson)+query(st,rson);}int main(){ int n,l,r,c; while(~scanf("%d",&n)) { memset(cl,-1,sizeof(cl)); memset(num,0,sizeof(num)); while(n--) { scanf("%d%d%d",&l,&r,&c); update(l,r-1,c,root); } int y=-1; for(int i=0;i<=8000;i++) { int x=query(i,root); //cout<
        =0)num[x]++; } for(int i=0;i<=8000;i++) { if(num[i]) { printf("%d %d\n",i,num[i]); } } cout<

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