int main(int argc, char const *argv[]) {
int n,m;
while (~scanf("%d%d", &n,&m )) {
//printf("%lld\n", jiechen(3) );
if(n == 1 ) printf("1\n");
else if(m == 1 ) printf("1\n");
else if(n == 2 ) printf("%d\n", m-1);
else if(m == 2 ) printf("%d\n", n-1);
else {
long long int temp = n+m-4;
long long int temp3 = n-2;
long long int temp1 = jiechen(temp) / (jiechen(temp-temp3) * jiechen(temp3));
printf("%I64d\n", temp1 % 1000000007);
}
}
}//c(m+n,min(m,n)-2)
float jiechen(int c) //递归函数法求阶乘
{
float d;
if(c==0||c==1) d=1;
else d=jiechen(c-1)*c;
return d;
}
int main()
{
double a[10];
double sum;
sum = 0;
for (int i = 0; i < 10; i++)
{
sum = 0;
for (int j = 0; j <= i; j++) {
sum += jiechen(j);
}
a[i] = sum;
}
printf("n e\n- -----------\n");
for (int i = 0; i < 10; i++) {
if (i == 8) {
printf("%d %.9f\n", i, a[i]);
continue;
}
printf("%d %.10g\n",i,a[i]);
}
getchar();
return 0;
}
void output()
{
char num[50]="0";
// gtk_entry_set_text(GTK_ENTRY(entry),"");
strcpy(num,gtk_entry_get_text(GTK_ENTRY(entry)));
gtk_entry_append_text(GTK_ENTRY(entry1),num);
if(flag==0) flag=1;
if(principle==16)
{
conversion(num,16,10);
b=p;
}
if(principle==10)
{
b=atof(num);
}
if(principle==8)
{
conversion(num,8,10);
b=p;
}
if(principle==2)
{
conversion(num,2,10);
b=p;
}
if(a==0&&b==0)
{
gtk_entry_set_text(GTK_ENTRY(entry1),"0=");
gtk_entry_set_text(GTK_ENTRY(entry),"0");
}
else
{
switch(method)
{
case 0: a=a+b;
right_output();
break;
case 1: a=a-b;
right_output();
break;
case 2: a=a*b;
right_output();
break;
case 3:
if(b==0)
{
a=0;
b=0;
method=0;
gtk_entry_set_text(GTK_ENTRY(entry),g_locale_to_utf8("除数不能为零",-1,NULL,NULL,NULL));
}
else
{
a=a/b; //C语言规定两个整数相除只取商的部分，但一个整数除以浮点数结果仍是浮点数
right_output();
}
break;
case 4:
a=pow(a,b);
right_output();
break;
case 5:
a=((int)a)&((int)b);
right_output();
break;
case 6:
a=((int)a)|((int)b);
right_output();
break;
case 7:
a=((int)a)^((int)b);
right_output();
break;
case 8:
if(b==0)
{
a=0;
b=0;
method=0;
gtk_entry_set_text(GTK_ENTRY(entry),g_locale_to_utf8("除数不能为零",-1,NULL,NULL,NULL));
}
else
{
a=((int)a)%((int)b); //C语言规定取余只能用于两个整数之间
right_output();
}
break;
case 9:
a=sin(b);
right_output();
break;
case 10:
a=cos(b);
right_output();
break;
case 11:
a=tan(b);
right_output();
break;
case 12:
a=exp(b);
right_output();
break;
case 13:
a=b*b*b;
gtk_entry_append_text(GTK_ENTRY(entry1),"^3");
right_output();
break;
case 14:
a=b*b;
gtk_entry_append_text(GTK_ENTRY(entry1),"^2");
right_output();
break;
case 15:
if(b<=0)
{
a=0;
b=0;
method=0;
gtk_entry_set_text(GTK_ENTRY(entry),g_locale_to_utf8("对数必须为正数",-1,NULL,NULL,NULL));
}
else
{
a=log(b);
right_output();
}
break;
case 16:
if(b<=0)
{
a=0;
b=0;
method=0;
gtk_entry_set_text(GTK_ENTRY(entry),g_locale_to_utf8("对数必须为正数",-1,NULL,NULL,NULL));
}
else
{
a=log10(b);
right_output();
}
break;
case 17:
if(b<0)
{
a=0;
b=0;
method=0;
gtk_entry_set_text(GTK_ENTRY(entry),g_locale_to_utf8("阶乘不能为负数",-1,NULL,NULL,NULL));
}
else
{
a=jiechen((int)b);
gtk_entry_append_text(GTK_ENTRY(entry1),"!");
right_output();
}
break;
case 18:
if(b==0)
{
a=0;
b=0;
method=0;
gtk_entry_set_text(GTK_ENTRY(entry),g_locale_to_utf8("除数不能为零",-1,NULL,NULL,NULL));
}
else
{
a=1/b;
right_output();
}
break;
case 19:
a=~((int)b);
right_output();
break;
case 20:
a=floor(b);
right_output();
break;
}
gtk_entry_append_text(GTK_ENTRY(entry1),"=");
}
}
