GOC103 "Cost Computation" - Editiorial

PROBLEM LINK:

https://www.codechef.com/problems/GOC103
https://www.codechef.com/GMCD2016/problems/GOC103

Author: https://www.codechef.com/users/nilesh_dbit
Tester: https://www.codechef.com/users/nilesh_dbit
Editorialist: https://www.codechef.com/users/nilesh_dbit

DIFFICULTY:

EASY

PREREQUISITES:

Matrix multiplication

PROBLEM:

Three people denoted by P1 , P2 , P3 intend to buy some rolls, buns, cakes and bread.
Each of them needs these commodities in differing amounts and can buy them in two shops S1 , S2 .
Which shop is the best for every person P1 , P2 , P3 to pay as little as possible?
The individual prices and desired quantities of the commodities are given in the following tables:

For example, the amount spent by the person P1 in the shop S1 is:
6 · 1 + 5 · 2 + 3 · 5 + 1 ·16 = 16

and in the shop S2 :
6 · 1 + 5 · 3 + 3 · 4 + 1 ·17 = 21,

for the other people similarly.

AUTHOR’S AND TESTER’S SOLUTIONS:




            #include<stdio.h>
    int main()
    {
    int a1[10][10],a2[10][10],a[10][10],i,j,k,r,s,t,sum=0;
    scanf("%d",&r);
    scanf("%d",&s);
    scanf("%d",&t);
    if((r>=2 && r<=5) && (s>=2 && s<=5) && (t>=2 && t<=5))
    {
    for(i=0;i<r;i++)
    {
        for(j=0;j<s;j++)
        {
         scanf("%d",&a1[i][j]);
        }
    }
    for(i=0;i<s;i++)
    {
        for(j=0;j<t;j++)
            {
            scanf("%d",&a2[i][j]);
            }
    }
    
    for(i=0;i<r;i++)
    {
        for(j=0;j<s;j++)
        {
            for(k=0;k<t;k++)
            {
            sum=sum+a1[i][k]*a2[k][j];
            }
            a[i][j]=sum;
            sum=0;
        }
    }
    for(i=0;i<r;i++)
    {
        for(j=0;j<t;j++)
        {
        printf("%d ",a[i][j]);
        }
        printf("\n");
    }
    }
    else
    printf("No. of rows/column is less than 2 or greater than 5");
    
    return 0;
    } 

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