define custom maxn via CP_ALGO_MAXN

Author: adamant-pwn

cp-algo/algebra/common.hpp

@@ -3,7 +3,11 @@
 #include <functional>
 #include <cstdint>
 namespace cp_algo::algebra {
+#ifdef CP_ALGO_MAXN
+    const int maxn = CP_ALGO_MAXN;
+#else
     const int maxn = 1 << 20;
+#endif
     const int magic = 250; // threshold for sizes to run the naive algo
 
     auto bpow(auto const& x, int64_t n, auto const& one, auto op) {

verify/algebra/matrix/characteristic.test.cpp

@@ -2,6 +2,7 @@
 #define PROBLEM "https://judge.yosupo.jp/problem/characteristic_polynomial"
 #pragma GCC optimize("Ofast,unroll-loops")
 #pragma GCC target("avx2,tune=native")
+#define CP_ALGO_MAXN 1 << 12
 #include "cp-algo/linalg/frobenius.hpp"
 #include <bits/stdc++.h>
 

verify/algebra/matrix/pow_fast.test.cpp

@@ -2,6 +2,7 @@
 #define PROBLEM "https://judge.yosupo.jp/problem/pow_of_matrix"
 #pragma GCC optimize("Ofast,unroll-loops")
 #pragma GCC target("avx2,tune=native")
+#define CP_ALGO_MAXN 1 << 12
 #include "cp-algo/linalg/frobenius.hpp"
 #include <bits/stdc++.h>