标签：hdu1698 hdu 1698 懒惰标记 线段树区间更新
Just a Hook
Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 22730 Accepted Submission(s): 11366
Problem Description
In the game of DotA, Pudge’s meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive metallic sticks which are of the same length.
Now Pudge wants to do some operations on the hook.
Let us number the consecutive metallic sticks of the hook from 1 to N. For each operation, Pudge can change the consecutive metallic sticks, numbered from X to Y, into cupreous sticks, silver sticks or golden sticks.
The total value of the hook is calculated as the sum of values of N metallic sticks. More precisely, the value for each kind of stick is calculated as follows:
For each cupreous stick, the value is 1.
For each silver stick, the value is 2.
For each golden stick, the value is 3.
Pudge wants to know the total value of the hook after performing the operations.
You may consider the original hook is made up of cupreous sticks.
Input
The input consists of several test cases. The first line of the input is the number of the cases. There are no more than 10 cases.
For each case, the first line contains an integer N, 1<=N<=100,000, which is the number of the sticks of Pudge’s meat hook and the second line contains an integer Q, 0<=Q<=100,000, which is the number of the operations.
Next Q lines, each line contains three integers X, Y, 1<=X<=Y<=N, Z, 1<=Z<=3, which defines an operation: change the sticks numbered from X to Y into the metal kind Z, where Z=1 represents the cupreous kind, Z=2 represents the silver kind and Z=3 represents
the golden kind.
Output
For each case, print a number in a line representing the total value of the hook after the operations. Use the format in the example.
Sample Input
Sample Output
Case 1: The total value of the hook is 24.
Source
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更新的时候不要直接更新到底部，会超时的。不用尝试。。我已经当了小白鼠。。
要用懒惰标记..就是更新的时候只更新到区间，同时lazy[]数组标记一下，如果下次更新的时候用到了上次已经更新的点
在把上次lazy[]数组标记的往下更新
想感叹。。做ACM的 太累了。。你做对还不行 还要不能超时
#include <stdio.h>
struct node
{
int left,right,val,lazy,tag;
}c[100000*3];
void build_tree(int l,int r,int root)
{
c[root].left=l;
c[root].right=r;
c[root].lazy=0;
c[root].tag=0;
if(l==r)
{
c[root].val=1;
return ;
}
int mid=(c[root].left+c[root].right)/2;
build_tree(l,mid,root*2);
build_tree(mid+1,r,root*2+1);
c[root].val=c[root*2].val+c[root*2+1].val;
}
void update_tree(int l,int r,int x,int root)
{
if(c[root].left==l&&r==c[root].right)
{
c[root].val=(r-l+1)*x;
c[root].lazy=1;
c[root].tag=x;
return ;
}
int mid=(c[root].left+c[root].right)/2;
if(c[root].lazy==1)
{
c[root].lazy=0;
update_tree(c[root].left,mid,c[root].tag,root*2);
update_tree(mid+1,c[root].right,c[root].tag,root*2+1);
c[root].tag=0;
}
if(mid<l)
update_tree(l,r,x,root*2+1);
else if(mid>=r)
update_tree(l,r,x,root*2);
else
{
update_tree(l,mid,x,root*2);
update_tree(mid+1,r,x,root*2+1);
}
c[root].val=c[root*2].val+c[root*2+1].val;
}
int main()
{
int ncase,n,k;
scanf("%d",&ncase);
for(int t=1;t<=ncase;t++)
{
scanf("%d",&n);
build_tree(1,n,1);
scanf("%d",&k);
while(k--)
{
int a,b,x;
scanf("%d %d %d",&a,&b,&x);
update_tree(a,b,x,1);
}
printf("Case %d: The total value of the hook is %d.\n",t,c[1].val);
}
return 0;
}
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hdu1698 Just a Hook (线段树区间更新 懒惰标记)
标签：hdu1698 hdu 1698 懒惰标记 线段树区间更新
原文地址：http://blog.csdn.net/su20145104009/article/details/47606855
