USACO 1.1 Greedy Gift Givers (gift1)

/*ID: haolink1PROG: gift1LANG: C++*///#include <iostream>#include <stdlib.h>#include <fstream>#include <string.h>#include <assert.h>using namespace std;//compute the member position for earnings arrayunsigned short MemberPosition(char** name_array,unsigned short group_num,                              char* name){    unsigned short i=0;    for(;i<group_num;i++){        if(strcmp(name_array[i],name)==0)            return i;    }    cout<<"MemberPosition error"<<endl;    assert(i<group_num);    return 0;}//note the length stringvoid ExtractSting(char* giving_info,unsigned short giving_info_len,                   char* giving_money, unsigned short giving_money_len,                   char* receiver_num, unsigned short receiver_num_len ){    unsigned short i=0;    for(;i<giving_info_len;i++){        if(giving_info[i] == ' ' && i!=0){            strncpy(giving_money,giving_info,giving_money_len-1);            /* null character manually added */            giving_money[giving_money_len-1]='\0';            strncpy(receiver_num,giving_info+i+1,receiver_num_len-1);            receiver_num[receiver_num_len-1]='\0';            return;        }    }}int main(){    ifstream fin("gift1.in");    char group_number_char[3];    fin.getline(group_number_char,3);    unsigned short group_num = atoi(group_number_char);    if(group_num < 2 || group_num > 10)        return 0;    //read name    char** name_array=new char* [group_num];    int* earnings = new int[group_num];    for(unsigned short i=0;i<group_num;i++){        name_array[i] = new char[14];        fin.getline(name_array[i],14);        earnings[i] = 0;    }    //handle the each member transaction    for(unsigned short i=0;i<group_num;i++){        char* giver = new char[14];        fin.getline(giver,14);        char giving_info[10];        fin.getline(giving_info,10);        char give_money_str[6];        char receiver_num_str[4];        ExtractSting(giving_info,10,give_money_str,5,receiver_num_str,3);        unsigned short give_money = atoi(give_money_str);        unsigned short receiver_num = atoi(receiver_num_str);        if(receiver_num==0)         continue;        //update earnings        unsigned short received_money = give_money/receiver_num;        for(unsigned short i=0;i<receiver_num;i++){            char receiver[14];            fin.getline(receiver,14);            //update receivers' earnings            earnings[MemberPosition(name_array,group_num,receiver)]+=received_money;        }        //update giver's earnings        earnings[MemberPosition(name_array,group_num,giver)]-=received_money*receiver_num;    }    ofstream fout ("gift1.out");    for(unsigned short i=0;i<group_num;i++){        fout<<name_array[i]<<" "<<earnings[i]<<endl;        delete name_array[i];    }    delete[] earnings;    return 0;}