Deck
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 745 Accepted Submission(s): 395
Problem Description
A
single playing card can be placed on a table, carefully, so that the
short edges of the card are parallel to the table's edge, and half the
length of the card hangs over the edge of the table. If the card hung
any further out, with its center of gravity off the table, it would fall
off the table and flutter to the floor. The same reasoning applies if
the card were placed on another card, rather than on a table.
Two playing cards can be arranged, carefully, with short edges parallel to table edges, to extend 3/4 of a card length beyond the edge of the table. The top card hangs half a card length past the edge of the bottom card. The bottom card hangs with only 1/4 of its length past the table's edge. The center of gravity of the two cards combined lies just over the edge of the table.
Three playing cards can be arranged, with short edges parallel to table edges, and each card touching at most one other card, to extend 11/12 of a card length beyond the edge of the table. The top two cards extend 3/4 of a card length beyond the edge of the bottom card, and the bottom card extends only 1/6 over the table's edge; the center of gravity of the three cards lines over the edges of the table.
If you keep stacking cards so that the edges are aligned and every card has at most one card above it and one below it, how far out can 4 cards extend over the table's edge? Or 52 cards? Or 1000 cards? Or 99999?
Two playing cards can be arranged, carefully, with short edges parallel to table edges, to extend 3/4 of a card length beyond the edge of the table. The top card hangs half a card length past the edge of the bottom card. The bottom card hangs with only 1/4 of its length past the table's edge. The center of gravity of the two cards combined lies just over the edge of the table.
Three playing cards can be arranged, with short edges parallel to table edges, and each card touching at most one other card, to extend 11/12 of a card length beyond the edge of the table. The top two cards extend 3/4 of a card length beyond the edge of the bottom card, and the bottom card extends only 1/6 over the table's edge; the center of gravity of the three cards lines over the edges of the table.
If you keep stacking cards so that the edges are aligned and every card has at most one card above it and one below it, how far out can 4 cards extend over the table's edge? Or 52 cards? Or 1000 cards? Or 99999?
Input
Input contains several nonnegative integers, one to a line. No integer exceeds 99999.
Output
The standard output will contain, on successful completion of the program, a heading:
# Cards Overhang
(that's two spaces between the words) and, following, a line for each input integer giving the length of the longest overhang achievable with the given number of cards, measured in cardlengths, and rounded to the nearest thousandth. The length must be expressed with at least one digit before the decimal point and exactly three digits after it. The number of cards is right-justified in column 5, and the decimal points for the lengths lie in column 12.
# Cards Overhang
(that's two spaces between the words) and, following, a line for each input integer giving the length of the longest overhang achievable with the given number of cards, measured in cardlengths, and rounded to the nearest thousandth. The length must be expressed with at least one digit before the decimal point and exactly three digits after it. The number of cards is right-justified in column 5, and the decimal points for the lengths lie in column 12.
Sample Input
1
2
3
4
30
Sample Output
The line of digits is intended to guide you in proper output alignment, and is not part of the output that your solution should produce.
12345678901234567
# Cards Overhang
1 0.500
2 0.750
3 0.917
4 1.042
30 1.997
# Cards Overhang
1 0.500
2 0.750
3 0.917
4 1.042
30 1.997
Source
采用打表法。
郁闷的是同样一个题，在hdu和zoj上边都通过了，在poj上边的输出略有不同，可是修改输出还是不行一直的wrong，因此这道题只是在zoj和hdu上边通过了。
hdu(1330)、zoj(1216)、poj(1607)同一个题，只是输出要求略有不同。可能是格式化的问题，不再追究了。
下边的代码是在zoj和hdu上通过的代码。
#include <stdio.h> #define MAX_NUM 100000 int main() { int i; double num[MAX_NUM]; double sum=0.0; int index; num[0] = 0.0; for(i=1;i<MAX_NUM;i++) { sum+=1.0/(i+i); num[i]=sum; } printf("# Cards Overhang\n"); while(scanf("%d",&index)!=EOF) printf("%5d%10.3lf\n",index,num[index]); return 0; }