Greedy Gift Givers

Greedy Gift Givers

A group of NP (2 ≤ NP ≤ 10) uniquely named friends has decided to exchange gifts of money. Each of these friends might or might not give some money to any or all of the other friends. Likewise, each friend might or might not receive money from any or all of the other friends. Your goal in this problem is to deduce how much more money each person gives than they receive.

The rules for gift-giving are potentially different than you might expect. Each person sets aside a certain amount of money to give and divides this money evenly among all those to whom he or she is giving a gift. No fractional money is available, so dividing 3 among 2 friends would be 1 each for the friends with 1 left over -- that 1 left over stays in the giver's "account".

In any group of friends, some people are more giving than others (or at least may have more acquaintances) and some people have more money than others.

Given a group of friends, no one of whom has a name longer than 14 characters, the money each person in the group spends on gifts, and a (sub)list of friends to whom each person gives gifts, determine how much more (or less) each person in the group gives than they receive.

IMPORTANT NOTE

The grader machine is a Linux machine that uses standard Unix conventions: end of line is a single character often known as '\n'. This differs from Windows, which ends lines with two charcters, '\n' and '\r'. Do not let your program get trapped by this!

PROGRAM NAME: gift1

INPUT FORMAT

Line 1:	The single integer, NP
Lines 2..NP+1:	Each line contains the name of a group member
Lines NP+2..end:	NP groups of lines organized like this: The first line in the group tells the person's name who will be giving gifts. The second line in the group contains two numbers: The initial amount of money (in the range 0..2000) to be divided up into gifts by the giver and then the number of people to whom the giver will give gifts, NGi (0 ≤ NGi ≤ NP-1). If NGi is nonzero, each of the next NGi lines lists the the name of a recipient of a gift.

SAMPLE INPUT (file gift1.in)

5
dave
laura
owen
vick
amr
dave
200 3
laura
owen
vick
owen
500 1
dave
amr
150 2
vick
owen
laura
0 2
amr
vick
vick
0 0

OUTPUT FORMAT

The output is NP lines, each with the name of a person followed by a single blank followed by the net gain or loss (final_money_value - initial_money_value) for that person. The names should be printed in the same order they appear on line 2 of the input.

All gifts are integers. Each person gives the same integer amount of money to each friend to whom any money is given, and gives as much as possible that meets this constraint. Any money not given is kept by the giver.

SAMPLE OUTPUT (file gift1.out)

dave 302
laura 66
owen -359
vick 141
amr -150
题解： n为人的名字个数
      n个名字
      接下来有n
--------------------
      输入一个名字
      输入要给的钱数 和 人数
      要给的人的名字
---------------------
OK code：

 /*
 ID: ******
 PROG: gift1
 LANG: C++
 */
 #include <iostream>
 #include <fstream>
 #include <string.h>
 using namespace std;
 typedef struct
 {
     char name[];
     int receive;
 }person;
 person P[];
 int find(char s[],int m)
 {
     int i;
     for(i=;i<m;i++)
         if(strcmp(P[i].name,s)==)
             break;
         return i;
 }

 int main() {
     ofstream fout ("gift1.out");
     ifstream fin ("gift1.in");

     char s[];
     int m,n,t,i,v,g,f,j;
     fin>>m;
     for(i=;i<m;i++)
     {
         fin>>P[i].name;
         P[i].receive=;
     }
     for(i=;i<m;i++)
     {
         fin>>s;
         fin>>t>>v;
         n=find(s,m);
         P[n].receive-=t;
         if(t== && v==) //要注意 0/0的情况，如果直接0/0 就会编译错误
            f=;
         else if(t%v== )
             f=t/v;
         else if(t%v!=)
         {
             g=t-(t%v);
             f=g/v;
             P[n].receive+=(t%v);
         }
         for(j=;j<v;j++)
         {
             fin>>s;
             n=find(s,m);
             P[n].receive+=f;
         }
     }
     for(i=;i<m;i++)
         fout<<P[i].name<<" "<<P[i].receive<<endl;
     return ;
 }

官方代码：

#include <stdio.h>
#include <string.h>
#include <assert.h>

#define MAXPEOPLE 10
#define NAMELEN    32

typedef struct Person Person;
struct Person {
    char name[NAMELEN];
    int total;
};

Person people[MAXPEOPLE];
int npeople;

void
addperson(char *name)
{
    assert(npeople < MAXPEOPLE);
    strcpy(people[npeople].name, name);
    npeople++;
}

Person*
lookup(char *name)
{
    int i;

    /* look for name in people table */
    for(i=; i<npeople; i++)
    if(strcmp(name, people[i].name) == )
        return &people[i];

    assert();    /* should have found name */
}

int
main(void)
{
    char name[NAMELEN];
    FILE *fin, *fout;
    int i, j, np, amt, ng;
    Person *giver, *receiver;

    fin = fopen("gift1.in", "r");
    fout = fopen("gift1.out", "w");

    fscanf(fin, "%d", &np);
    assert(np <= MAXPEOPLE);

    for(i=; i<np; i++) {
    fscanf(fin, "%s", name);
    addperson(name);
    }

    /* process gift lines */
    for(i=; i<np; i++) {
    fscanf(fin, "%s %d %d", name, &amt, &ng);
    giver = lookup(name);

    for(j=; j<ng; j++) {
        fscanf(fin, "%s", name);
        receiver = lookup(name);
        giver->total -= amt/ng;
        receiver->total += amt/ng;
    }
    }

    /* print gift totals */
    for(i=; i<np; i++)
    fprintf(fout, "%s %d\n", people[i].name, people[i].total);
    exit ();
}

===================测试数据===============================

------- test 1 ----
10

mitnik

Poulsen

Tanner

Stallman

Ritchie

Baran

Spafford

Farmer

Venema

Linus

mitnik

300 3

Poulsen

Tanner

Baran

Poulsen

1000 1

Tanner

Spafford

2000 9

mitnik

Poulsen

Tanner

Stallman

Ritchie

Baran

Farmer

Venema

Linus

Tanner

1234 1

Poulsen

Stallman

536 3

Farmer

Venema

Linus

Ritchie

2000 1

mitnik

Baran

79 2

Tanner

Farmer

Farmer

0 0

Venema

12 9

mitnik

Poulsen

Tanner

Stallman

Ritchie

Baran

Spafford

Farmer

Linus

Linus

1000 1

mitnik

------- test 2 ----
5

dave

laura

owen

vick

amr

dave

200 3

laura

owen

vick

owen

500 1

dave

amr

150 2

vick

owen

laura

0 2

amr

vick

vick

0 0

------- test 3 ----
2

john

lennon

lennon

0 0

john

0 0

------- test 4 ----
10

Alex

Bob

Catherine

Dave

Ebert

Francis

Godot

Harris

Iliya

Jimbo

Alex

2000 9

Bob

Catherine

Dave

Ebert

Francis

Godot

Harris

Iliya

Jimbo

Bob

2000 9

Alex

Catherine

Dave

Ebert

Francis

Godot

Harris

Iliya

Jimbo

Catherine

2000 9

Alex

Bob

Dave

Ebert

Francis

Godot

Harris

Iliya

Jimbo

Dave

2000 9

Alex

Bob

Catherine

Ebert

Francis

Godot

Harris

Iliya

Jimbo

Ebert

2000 9

Alex

Bob

Catherine

Dave

Francis

Godot

Harris

Iliya

Jimbo

Francis

2000 9

Alex

Bob

Catherine

Dave

Ebert

Godot

Harris

Iliya

Jimbo

Godot

2000 9

Alex

Bob

Catherine

Dave

Ebert

Francis

Harris

Iliya

Jimbo

Harris

2000 9

Alex

Bob

Catherine

Dave

Ebert

Francis

Godot

Iliya

Jimbo

Iliya

2000 9

Alex

Bob

Catherine

Dave

Ebert

Francis

Godot

Harris

Jimbo

Jimbo

2000 9

Alex

Bob

Catherine

Dave

Ebert

Francis

Godot

Harris

Iliya

------- test 5 ----
4

these

names

are

dumb

dumb

534 3

these

dumb

are

are

351 1

names

these

509 2

dumb

names

names

278 1

dumb

------- test 6 ----
2

someguy

someotherguy

someotherguy

1500 1

someguy

someguy

500 1

someotherguy

------- test 7 ----
8

a

b

c

d

e

f

g

h

c

500 4

a

b

d

h

f

290 3

a

b

c

a

489 7

b

c

d

e

f

h

g

g

0 0

e

1789 2

f

h

d

2000 5

a

b

h

f

e

b

192 5

a

c

h

g

d

h

0 2

a

b

------- test 8 ----
10

paul

stan

mark

doug

fred

bill

hank

rich

mike

john

paul

0 0

john

300 2

paul

stan

stan

1000 1

paul

mark

2000 3

paul

stan

doug

doug

510 2

paul

stan

fred

1560 2

paul

stan

bill

178 2

paul

stan

hank

97 2

paul

stan

rich

1999 2

paul

stan

mike

1531 2

paul

stan

------- test 9 ----
10

paul

stan

mark

doug

fred

bill

hank

rich

mike

john

paul

1693 6

stan

mark

doug

fred

bill

hank

john

1843 3

hank

mike

paul

stan

1346 9

paul

mark

fred

bill

doug

hank

rich

mike

john

mark

1657 1

paul

doug

1256 9

paul

stan

bill

mark

fred

rich

hank

mike

john

fred

1250 6

paul

stan

bill

rich

john

mike

bill

1999 2

john

mike

hank

2000 8

stan

mark

doug

fred

rich

bill

mike

john

rich

1999 3

paul

bill

hank

mike

1999 5

hank

bill

mark

rich

john

Keep up the good work!