ACMICPC Live Archive 第4889题 Post Office

　　ACM-ICPC Live Archive 第4889题，Post Office（题目链接）。

Post Office

Problem Description

Other than postcards, the post office department of some country recognizes three classes of mailable items: letters, packets, and parcels. The three dimensions of a mailable item are called length, height and thickness, with length being the largest and thickness the smallest of the three dimensions.

A letter's length must be at least 125mm but not more than 290mm, its height at least 90mm but not more than 155mm, and its thickness at least 0.25mm but not more than 7mm. (The unit millimeter is abbreviated by mm.)

All three of a packet's dimensions must be greater than or equal to the corresponding minimum dimension for a letter, and at least one of its dimensions must exceed the corresponding maximum for a letter. Furthermore, a packet's length must be no more than 380mm, its height no more than 300mm, and its thickness no more than 50mm.

All three of a parcel's dimensions must be greater than or equal to the corresponding minimum dimension for a letter, and at least one of its dimensions must exceed the corresponding maximum for a packet. Furthermore, the parcel's combined length and girth may not exceed 2100mm. (The girth is the full perimeter measured around the parcel, perpendicular to the length.)

Input

The input will contain data for a number of problem instances. For each problem instance, the input will consist of the three dimensions (measured in mm) of an item, in any order. The length and width will be positive integers. The thickness will be either a positive integer or a positive floating point number. The input will be terminated by a line containing three zeros.

Output

For each problem instance, your program will classify the item as letter, packet, parcel or not mailable. This verdict will be displayed at the beginning of a new line, in lower case letters.

Sample Input

100 120 100
0.5 100 200
100 10 200
200 75 100
0 0 0

Sample Output

not mailable
letter
packet
parcel

　　这题目没有任何难度。先进行一次排序。最长的作为length，中等长度的作为height，最短的作为thickness。然后判断length ≥ 125且height ≥ 90且thickness ≥ 0.25是否满足。如果不满足，那就输出not mailable，否则，如果length ≤ 290且height ≤ 155且thickness ≤ 7是否满足，如果满足，则输出letter，否则，判断length ≤ 380且height ≤ 300且thickness ≤ 50是否成立，如果成立，输出packet，否则，判断length + girth ≤ 2100是否成立，如果成立，输出parcel，否则，输出not mailable。C语言代码如下：

/***
*            ACM-ICPC Live Archive　第4889题　　Post Office
*
*
*
*                            叶剑飞
*                            2012年10月2日
*
*******************************************************************************/

#include <stdio.h>
#include <stdlib.h>

void swap ( double * a, double * b )
{
    double temp = *a;
    *a = *b;
    *b = temp;
}

int main (void)
{
    double temp;
    double length, height, thickness;
    while ( scanf( "%lf%lf%lf", &length, &height, &thickness ) , 
        length || height || thickness )
    {
        if ( length < height )
            swap( &length, &height );
        if ( length < thickness )
            swap( &length, &thickness );
        if ( height < thickness )
            swap( &height, &thickness );
        if ( length >= 125 && height >= 90 && thickness >= 0.25 )
        {
            if ( length <= 290 && height <= 155 && thickness <= 7 )
                puts( "letter" );
            else if ( length <= 380 && height <= 300 && thickness <= 50 )
                puts( "packet" );
            else if ( length + height + height + thickness + thickness <= 2100 )
                puts( "parcel" );
            else
                puts( "not mailable" );
        }
        else
            puts( "not mailable" );

    }
    return EXIT_SUCCESS;
}