cautruc

#include <stdio.h>
#include <stdlib.h>
struct hocsinh
{
	char hoten[31];
	char mssv[10];
	float dt, dv, dtb;
};
void nhaptunghocsinh(int i, hocsinh &hs)
{
	printf("Hoc sinh thu %d: \n", i);
	printf("\n\tTen: "); gets_s(hs.hoten);
	printf("\n\tMSSV: "); gets_s(hs.mssv);
	printf("\n\tDiem toan: "); scanf_s("%f", &hs.dt); scanf("%*c");
	printf("\n\tDiem van: "); scanf_s("%f", &hs.dv); scanf("%*c");
}
void nhap(int n, hocsinh hs[])
{
	for (int i = 0; i < n; i++)
	{
		nhaptunghocsinh(i + 1, hs[i]);
	}
}
void tinhtrungbinh(int n, hocsinh hs[])
{
	for (int i = 0; i < n; i++)
		hs[i].dtb = (hs[i].dt + hs[i].dv) / 2;
}
int tbmax(int n, hocsinh hs[])
{
	int *x = (int *)malloc(n * sizeof(int));
	if (x == NULL) return -1;
	int t;
	for (int i = 0; i < n; i++) x[i] = i;
	for (int i = 0; i < n; i++)
	{
		for (int j = i + 1; j < n; j++)
		{
			if (hs[x[i]].dtb < hs[x[j]].dtb)
			{
				t = x[i];
				x[i] = x[j];
				x[j] = t;
			}
		}
	}
	t = x[0];
	free(x);
	return t;
}