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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 ) .
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.
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
The output should contain the minimum setup time in minutes, one per line.
2 1 3
1 #include <stdio.h> 2 #include <algorithm> 3 4 struct st { 5 int l, w, vis; 6 bool operator<(const st&c)const { 7 return l==c.l?w<c.w:l<c.l; 8 } 9 }stick[5001]; 10 11 int n; 12 void read() { 13 scanf("%d", &n); 14 for(int i=0; i<n; i++) { 15 scanf("%d%d", &stick[i].l, &stick[i].w); 16 stick[i].vis = 0; 17 } 18 } 19 20 void find(int i) { 21 int k = i; 22 for(int j=i+1; j<n; j++) 23 if(!stick[j].vis) 24 if(stick[k].w<=stick[j].w) { 25 stick[j].vis = 1; 26 k=j; 27 } 28 } 29 30 void work() { 31 int res = 0; 32 std::sort(stick, stick+n); 33 for(int i=0; i<n; i++) { 34 if(!stick[i].vis) { 35 stick[i].vis = 1; 36 ++res; 37 find(i); 38 } 39 } 40 printf("%d\n", res); 41 } 42 43 int main() { 44 int T, n; 45 scanf("%d", &T); 46 while(T--) { 47 read(); 48 work(); 49 } 50 return 0; 51 }
SPOJ MSTICK. Wooden Sticks 贪心 结构体排序
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原文地址：http://www.cnblogs.com/BlackStorm/p/4948869.html
