C:追逐梦想鱼的心思古朴而纯情在追逐梦想的星空保持着现实与虚幻你从容温和自信以岁月将那些凹凸不平的棱镜磨平我在想你知道吗

main()
{
int n,m;
int i,j;
int a[30][30] = {0};
while ((scanf("%d",&n)) != NULL){
scanf("%d",&m);
for (i = 0; i < n; i++){
for (j = 0; j < m; j++){
if (i == 0 || j == 0)
a[i][j] = 1;
else
a[i][j] = a[i - 1][j] + a[i][j - 1];
}
}
printf("%d\n",a[n - 1][m - 1]);
}
return 0;
}