OneANOVA, C++ (gcc)

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//g++  7.4.0
//One-factor ANOVA
//code is created by Rezaul Hoque on January 15,2021
//please contact at jewelmrh@yahoo.com
#include <iostream>
using namespace std;
int main ()
{
int a[3][4] = {48,49,50,49,47,49,48,48,49,51,50,50};
float sum1=0,sum2=0,sum3=0,sum4=0,sumX=0;
for (int i=0; i<3;i++)
{
for(int j=0;j<4; j++)
sumX += a[i][j];
}

for (int j=0;j<4; j++)
{
sum1 += a[0][j];
sum2 += a[1][j];
sum3 += a[2][j];
}
for (int i=0; i<3;i++)
{
sum4 += a[i][1];
}

//calculate row means and grand mean
float greatX, romean1,romean2,romean3,colmean1;
 romean1 = sum1/4;
romean2 = sum2/4;
romean3 = sum3/4;
colmean1 = sum4/3;
greatX = sumX/12;

float * b = new float[3];
b[0]= romean1;
b[1]= romean2;
b[2]= romean3;

float varB=0,varW, sumTV=0;
//calculate total variation
for(int i=0;i<3;i++)
{
for(int j=0; j<4; j++)
sumTV += (a[i][j]- greatX)*(a[i][j]- greatX);
}
//calculate variation between treatment 
for(int i=0;i<3;i++)
{
varB +=( 4*((b[i]-greatX)*(b[i]-greatX)));
}
//calculate variation within treatment 
varW= sumTV-varB;
//calculate mean squares and F
float meansqB, meansqW, theF;
meansqB= varB/(4-1);
meansqW = varW/(3*(4-1));
theF = meansqB/meansqW;
cout<<" The row-treatment and column-measurement look like:\n";
for (int i=0; i<3;i++)
{
for(int j=0;j<4; j++)
cout<<" "<<a[i][j];
cout<<endl;

}

cout<<"The grand mean:\t"<<greatX;
cout<<endl;
cout<<" Total variation is:\t"<<sumTV;
cout<<endl;
cout<<" Variation between treatment:\t"<<varB;
cout<<endl;
cout<<" Variation within treatment:\t"<<varW;
cout<<endl;
cout<<" F :\t"<< theF;
return 0;
}

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Compilation time: 0.43 sec, absolute running time: 0.16 sec, cpu time: 0.01 sec, memory peak: 6 Mb, absolute service time: 0,71 sec