diff --git a/include.hh b/include.hh
index 6b334ee..2512908 100644
--- a/include.hh
+++ b/include.hh
@@ -1,6 +1,14 @@
+/////////////////////////////////////////////////////////
+/**
+ * Useful Macros
+ *   by subcrip
+ * (requires C++17)
+ */
+
 #include<bits/stdc++.h>
 using namespace std;
 
+/* macro helpers */
 #define __NARGS(...) std::tuple_size<decltype(std::make_tuple(__VA_ARGS__))>::value
 #define __DECOMPOSE_S(a, x) auto x = a;
 #define __DECOMPOSE_N(a, ...) auto [__VA_ARGS__] = a;
@@ -8,6 +16,7 @@ constexpr void __() {}
 #define __AS_PROCEDURE(...) __(); __VA_ARGS__; __()
 #define __as_typeof(container) decltype(container)::value_type
 
+/* type aliases */
 using ll = int64_t;
 using ull = uint64_t;
 using pii = pair<int, int>;
@@ -15,17 +24,20 @@ using pil = pair<int, ll>;
 using pli = pair<ll, int>;
 using pll = pair<ll, ll>;
 
+/* constants */
 constexpr ull MDL = 1e9 + 7;
 constexpr ull PRIME = 998244353;
 constexpr ull MDL1 = 825;
 constexpr ull MDL2 = 87825;
 
+/* bit-wise operations */
 #define lowbit(x) ((x) & -(x))
 #define popcount(x) (__builtin_popcountll(ll(x)))
 #define parity(x) (__builtin_parityll(ll(x)))
 #define msp(x) (63LL - __builtin_clzll(ll(x)))
 #define lsp(x) (__builtin_ctzll(ll(x)))
 
+/* fast pairs */
 #define upair ull
 #define umake(x, y) (ull(x) << 32 | ull(y))
 #define u1(p) ((p) >> 32)
@@ -50,8 +62,21 @@ struct igt {
     }
 };
 
+/* conditions */
+#define loop while (1)
+#define continue_or(var, val) __AS_PROCEDURE(if (var == val) continue; var = val;)
+#define break_or(var, val) __AS_PROCEDURE(if (var == val) break; var = val;)
+
+/* build data structures */
 #define unordered_counter(from, to) __AS_PROCEDURE(unordered_map<__as_typeof(from), size_t> to; for (auto&& x : from) ++to[x];)
 #define counter(from, to, cmp) __AS_PROCEDURE(map<__as_typeof(from), size_t, cmp> to; for (auto&& x : from) ++to[x];)
+#define pa(a) __AS_PROCEDURE(__typeof(a) pa; pa.push_back({}); for (auto&&x : a) pa.push_back(pa.back() + x);)
+#define sa(a) __AS_PROCEDURE(__typeof(a) sa(a.size() + 1); {int n = a.size(); for (int i = n - 1; i >= 0; --i) sa[i] = sa[i + 1] + a[i];};)
+#define adj(ch, n) __AS_PROCEDURE(vector<vector<int>> ch((n) + 1);)
+#define edge(ch, u, v) __AS_PROCEDURE(ch[u].push_back(v), ch[v].push_back(u);)
+#define Edge(ch, u, v) __AS_PROCEDURE(ch[u].push_back(v);)
+
+/* io */
 #define untie __AS_PROCEDURE(ios_base::sync_with_stdio(0), cin.tie(NULL))
 template<typename T> void __read(T& x) { cin >> x; }
 template<typename T, typename... U> void __read(T& x, U&... args) { cin >> x; __read(args...); }
@@ -61,17 +86,12 @@ template<typename T, typename... U> void __read(T& x, U&... args) { cin >> x; __
 #define debug(x) __AS_PROCEDURE(cerr << #x" = " << x << endl;)
 #define debugvec(a) __AS_PROCEDURE(cerr << #a" = "; for (auto&& x : a) cerr << x << ' '; cerr << endl;)
 
-#define pa(a) __AS_PROCEDURE(__typeof(a) pa; pa.push_back({}); for (auto&&x : a) pa.push_back(pa.back() + x);)
-#define sa(a) __AS_PROCEDURE(__typeof(a) sa(a.size() + 1); {int n = a.size(); for (int i = n - 1; i >= 0; --i) sa[i] = sa[i + 1] + a[i];};)
-
+/* pops */
 #define poptop(q, ...) __AS_PROCEDURE(auto [__VA_ARGS__] = q.top(); q.pop();)
 #define popback(q, ...) __AS_PROCEDURE(auto [__VA_ARGS__] = q.back(); q.pop_back();)
 #define popfront(q, ...) __AS_PROCEDURE(auto [__VA_ARGS__] = q.front();q.pop_front();)
 
-#define adj(ch, n) __AS_PROCEDURE(vector<vector<int>> ch((n) + 1);)
-#define edge(ch, u, v) __AS_PROCEDURE(ch[u].push_back(v), ch[v].push_back(u);)
-#define Edge(ch, u, v) __AS_PROCEDURE(ch[u].push_back(v);)
-
+/* algorithms */
 vector<int> kmp(string s, string t) {  // find all t in s
     int n = s.length(), m = t.length();
     vector<int> next; next.push_back(-1);
@@ -91,3 +111,4 @@ vector<int> kmp(string s, string t) {  // find all t in s
         } else j = next[j];
     return res;
 }
+/////////////////////////////////////////////////////////