发个可以O(n)时间求逆的代码
int[] inv = new int[MAXN]; inv[1] = 1; for (int i = 2; i<MAXN; i++) inv[i] = inv[MOD%i]*(MOD-MOD/i)%MOD;
注意这里的MOD必须是素数。
摘自TopCoder上某人的代码。
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int[] inv = new int[MAXN]; inv[1] = 1; for (int i = 2; i<MAXN; i++) inv[i] = inv[MOD%i]*(MOD-MOD/i)%MOD;
注意这里的MOD必须是素数。
摘自TopCoder上某人的代码。
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