#include<stdio.h>
#include<conio.h>
#include<math.h>
#define MAX 100
void NhapMaTran(int a[][MAX], int &n)
{
do
{
printf("\nNhap n: ");
scanf("%d", &n);
if(n < 1 || n > MAX)
{
printf("\nSo phan tu khong hop le. Xin kiem tra lai !");
}
}while(n < 1 || n > MAX);
for(int i = 0; i < n; i++)
{
for(int j = 0; j < n; j++)
{
printf("\nNhap vao a[%d][%d] = ", i, j);
scanf("%d", &a[i][j]);
}
}
}
void XuatMaTran(int a[][MAX], int n)
{
for(int i = 0; i < n; i++)
{
for(int j = 0; j < n; j++)
{
printf("%4d",a[i][j]);
}
printf("\n\n");
}
}
int TinhTongCacPhanTuTamGiacDuoiDuongCheoChinh(int a[][MAX], int n)
{
/*for(int i = 1; i < n; i++)
{
for(int j = 0; j < i; j++)
{
printf("%4d",a[i][j]);
}
}*/
int tong = 0;
for(int i = 1; i < n; i++)
{
for(int j = i - 1; j >= 0; j--)
{
tong += a[i][j];
}
}
return tong;
}
int TinhTongCacPhanTuTamGiacDuoiDuongCheoPhu(int a[][MAX], int n)
{
int tong = 0;
for(int i = 1; i < n; i++)
{
for(int j = n - i; j < n; j++)
{
tong += a[i][j];
}
}
return tong;
}
int main()
{
int a[MAX][MAX], n;
NhapMaTran(a,n);
XuatMaTran(a,n);
int tong = TinhTongCacPhanTuTamGiacDuoiDuongCheoChinh(a, n);
printf("\nTong cac phan tu tam giac duoi duong cheo chinh = %d", tong);
int tong2 = TinhTongCacPhanTuTamGiacDuoiDuongCheoPhu(a, n);
printf("\nTong cac phan tu tam giac duoi duong cheo phu = %d", tong2);
getch();
return 0;
}