Description
There is a very long board with length L centimeter, L is a positive integer, so we can evenly divide the board into L segments, and they are labeled by 1, 2, ... L from left to right, each is 1 centimeter long. Now we have to color the board - one segment
with only one color. We can do following two operations on the board:
1. "C A B C" Color the board from segment A to segment B with color C.
2. "P A B" Output the number of different colors painted between segment A and segment B (including).
In our daily life, we have very few words to describe a color (red, green, blue, yellow…), so you may assume that the total number of different colors T is very small. To make it simple, we express the names of colors as color 1, color 2, ... color T. At the
beginning, the board was painted in color 1. Now the rest of problem is left to your.
Input
be larger than B) as an operation defined previously.
Output
Sample Input
2 2 4 C 1 1 2 P 1 2 C 2 2 2 P 1 2
Sample Output
2
1
#include<stdio.h>
#include<map>
#include<iostream>
using namespace std;
#define N 100000
struct node
{
int type,b;
}tree[4*N];
void biulde(int l,int r,int k)
{
int m=(l+r)/2;
tree[k].b=1; tree[k].type=1;
if(l==r) return ;
biulde(l,m,k*2); biulde(m+1,r,k*2+1);
}
int L,R,C;
void updataColor(int l,int r,int k)
{
int m=(l+r)/2;
if(tree[k].b&&tree[k].type==C) return ;
if(L<=l&&r<=R){
tree[k].type=C; tree[k].b=1;
return ;
}
if(tree[k].b){
tree[k*2].b=tree[k*2+1].b=1;
tree[k*2].type=tree[k*2+1].type=tree[k].type;
}
if(L<=m) updataColor(l,m,k*2);
if(R>m) updataColor(m+1,r,k*2+1);
tree[k].b=0;
}
int typesum;
map<int,int>types;
void count_typesum(int l,int r,int k)
{
int m=(l+r)/2;
if(tree[k].b){
if(types[tree[k].type]==0) typesum++;
types[tree[k].type]=1; return ;
}
if(L<=m) count_typesum(l,m,k*2);
if(R>m) count_typesum(m+1,r,k*2+1);
}
int main()
{
int m,n,T;
char c[2];
scanf("%d%d%d",&n,&T,&m);
biulde(1,n,1);
while(m--)
{
scanf("%s%d%d",c,&L,&R);
if(c[0]=='C'){
scanf("%d",&C);
updataColor(1,n,1);
}
else{
types.clear(); typesum=0;
count_typesum(1,n,1);
printf("%d\n",typesum);
}
}
}