请问这里为什么会memory limit exceeded

Question

走格子 输入起始点和终点
整数范围在正负一万内

#include<stdio.h>
int p[10000][10000];
int main() {
int n, m, a, b;
scanf("%D %D % %d", &a, &b, &n, &m);
if (a < 0 && n>0) {
a = -a;
n = n + a;
}
if (b < 0 && m>0) {
b = -b;
m = m + b;
}
if (a < 0 && n < 0) {
a = -a;
n = -n + a;
}
if (b < 0 && m < 0) {
b = -b;
m = -m + b;
}
for (int i = 1; i <= n; i++) {
p[i][1] = a;
}
for (int j = 1; j <= m; j++) {
p[1][j] = b;
}
for (int i = 2; i <= n; i++) {
for (int j = 2; j <= m; j++) {
if (i % 2 != 0 || j % 2 != 0) {
p[i][j] = p[i - 1][j] + p[i][j - 1];
}
}
}
printf("%d\n", p[n][m]);
return 0;
}

Answer 1

空间复杂度太高了，10000改小一点就好