add more KACTL macros

Author: lrvideckis

library/math/matrix_related/row_reduce.hpp

@@ -8,7 +8,7 @@
 //!   affected by row operations
 //! @time O(n * m * min(cols, n))
 //! @space O(1)
-pii row_reduce(vector<vector<int>>& mat, int cols) {
+pii row_reduce(vector<vi>& mat, int cols) {
   int n = sz(mat), m = sz(mat[0]), rank = 0;
   int det = 1;
   for (int col = 0; col < cols && rank < n; col++) {

library/math/matrix_related/solve_linear_mod.hpp

@@ -12,9 +12,8 @@
 //! @space O(m)
 struct solve_linear_mod {
   int rank, det;
-  vector<int> sol;
-  solve_linear_mod(vector<vector<int>>& mat,
-    const vector<int>& rhs) {
+  vi sol;
+  solve_linear_mod(vector<vi>& mat, const vi& rhs) {
     int n = sz(mat), m = sz(mat[0]);
     rep(i, 0, n) mat[i].push_back(rhs[i]);
     tie(rank, det) = row_reduce(mat, m);