杭电ACM1008
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(1)题目大意:
There is a pile of n wooden sticks. The length and weight of each stick are known in advance. The sticks are to be processed by a woodworking machine in one by one fashion. It needs some time, called setup time, for the machine to prepare processing a stick. The setup times are associated with cleaning operations and changing tools and shapes in the machine. The setup times of the woodworking machine are given as follows:
(a) The setup time for the first wooden stick is 1 minute.
(b) Right after processing a stick of length l and weight w , the machine will need no setup time for a stick of length l' and weight w' if l <= l' and w <= w'. Otherwise, it will need 1 minute for setup.
You are to find the minimum setup time to process a given pile of n wooden sticks. For example, if you have five sticks whose pairs of length and weight are ( 9 , 4 ) , ( 2 , 5 ) , ( 1 , 2 ) , ( 5 , 3 ) , and ( 4 , 1 ) , then the minimum setup time should be 2 minutes since there is a sequence of pairs ( 4 , 1 ) , ( 5 , 3 ) , ( 9 , 4 ) , ( 1 , 2 ) , ( 2 , 5 ) .
(a) The setup time for the first wooden stick is 1 minute.
(b) Right after processing a stick of length l and weight w , the machine will need no setup time for a stick of length l' and weight w' if l <= l' and w <= w'. Otherwise, it will need 1 minute for setup.
You are to find the minimum setup time to process a given pile of n wooden sticks. For example, if you have five sticks whose pairs of length and weight are ( 9 , 4 ) , ( 2 , 5 ) , ( 1 , 2 ) , ( 5 , 3 ) , and ( 4 , 1 ) , then the minimum setup time should be 2 minutes since there is a sequence of pairs ( 4 , 1 ) , ( 5 , 3 ) , ( 9 , 4 ) , ( 1 , 2 ) , ( 2 , 5 ) .
Input
The input consists of T test cases. The number of test cases (T) is given in the first line of the input file. Each test case consists of two lines: The first line has an integer n , 1 <= n <= 5000 , that represents the number of wooden sticks in the test case, and the second line contains 2n positive integers l1 , w1 , l2 , w2 ,..., ln , wn , each of magnitude at most 10000 , where li and wi are the length and weight of the i th wooden stick, respectively. The 2n integers are delimited by one or more spaces.
Output
The output should contain the minimum setup time in minutes, one per line.
Sample Input
3 5 4 9 5 2 2 1 3 5 1 4 3 2 2 1 1 2 2 3 1 3 2 2 3 1
Sample Output
213
题意是:将木棍放在机器里处理,第一根需要一分钟,剩余的如果大于等于前边放入的长度和重量,就不用费时间,否则需要一分钟,计算给出一组数的最少时间!用贪心算出最少降序序列个数!
(2)思路:
首先根据长度进行排序,然后在对重量进行比较,如果下一根小,则时间不加一,否则时间加以而且将此重量赋值。
(3)感想:
我就不明白了,这个题跟1001一模一样,我自己写的1001提交就对了,看着题目完全一样,就用以前的代码放上了,给我提示编译错误!!compile error,还真是日了狗了,所以我用1001的题目名字搜了一份代码,交在1008上,结果通过了,这里说明两份提完全一样的!!真不明白,日了狗了!
(4)代码:
自己的,跟1001一样:
#include<iostream>
#include<algorithm>
using namespace std;
struct My
{
int Wight, Long;
bool f = false;
bool operator<(const My &x)
{
if (x.Long == Long)
{
return Long < x.Long;
}
else
{
return Long < x.Long;
}
}
};
int main()
{
int n, m, mm = 0;
My my[5000];
cin >> m;
while (mm < m)
{
cin >> n;
for (int i = 0;i < n;i++)
{
cin >> my[i].Wight;
cin >> my[i].Long;
my[i].f = false;
}
sort(my, my + n);
int time = 0;
for (int i = 0;i < n; i++)
{
if (my[i].f == true)
{
continue;
}
else
{
time++;
my[i].f == true;
}
for (int j = i + 1;j < n;j++)
{
if (my[j].f == true)
{
continue;
}
else
{
if (my[j].Wight >= my[i].Wight&&my[j].Long >= my[i].Long)
{
my[j].f = true;
my[i].Long = my[j].Long;
my[i].Wight = my[j].Wight;
}
else
{
continue;
}
}
}
}
cout << time << endl;
mm++;
}
}
#include<algorithm>
using namespace std;
struct My
{
int Wight, Long;
bool f = false;
bool operator<(const My &x)
{
if (x.Long == Long)
{
return Long < x.Long;
}
else
{
return Long < x.Long;
}
}
};
int main()
{
int n, m, mm = 0;
My my[5000];
cin >> m;
while (mm < m)
{
cin >> n;
for (int i = 0;i < n;i++)
{
cin >> my[i].Wight;
cin >> my[i].Long;
my[i].f = false;
}
sort(my, my + n);
int time = 0;
for (int i = 0;i < n; i++)
{
if (my[i].f == true)
{
continue;
}
else
{
time++;
my[i].f == true;
}
for (int j = i + 1;j < n;j++)
{
if (my[j].f == true)
{
continue;
}
else
{
if (my[j].Wight >= my[i].Wight&&my[j].Long >= my[i].Long)
{
my[j].f = true;
my[i].Long = my[j].Long;
my[i].Wight = my[j].Wight;
}
else
{
continue;
}
}
}
}
cout << time << endl;
mm++;
}
}
网上找的:
#include<stdio.h>
#include<stdlib.h>
typedef struct stu{
int l,w;
}Lode;
Lode s[5005];
int cmp(constvoid *a,constvoid *b)
{
Lode *c,*d;
c=(Lode*)a;
d=(Lode*)b;
if(c->l!=d->l)
return d->l-c->l;
else return d->w-c->w;
}
intmain()
{
int t,n,i,j,ans;
scanf("%d",&t);
while(t--)
{
scanf("%d",&n);
for(i=0;i<n;i++)
scanf("%d%d",&s[i].l,&s[i].w);
qsort(s,n,sizeof(s[0]),cmp);
ans=n;for(i=1;i<n;i++)
for(j=0;j<=i-1;j++)
{
if(s[j].l>=s[i].l&&s[j].w>=s[i].w)
{
ans--;
s[j].l=s[i].l;
s[j].w=s[i].w;
s[i].l=0;
s[i].w=0;
break;
}
}
printf("%d\n",ans);
}
return0;
}
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