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source/Misc/FastI.cpp

@@ -0,0 +1,29 @@
+#define getint(n) int n; read(n)
+#define getll(n) ll n; read(n)
+#define inta getint(a)
+#define intab getint(a); getint(b)
+char get() {
+    static char buf[100000], *S=buf, *T=buf;
+    if(S == T) {
+        S = buf; T = buf + fread(buf, 1, 100000, stdin);
+        if(S == T) return EOF;
+    }
+    return *S++;
+}
+void read(int& n) {
+    n = 0; char c; bool neg = false;
+    for(c = get(); c < '0'; c=get()) if(c=='-') neg = true;
+    for(;c>='0';c=get()) n = n*10+c-'0';
+    if(neg) n = -n;
+}
+void read(ll& n) {
+    n = 0; char c; bool neg = false;
+    for(c = get(); c < '0'; c=get()) if(c=='-') neg = true;
+    for(;c>='0';c=get()) n = n*10+c-'0';
+    if(neg) n = -n;
+}
+int read(char s[]) {
+    char c; int p = 0; while((c = get()) <= ' ');
+    s[p++] = c; while((c = get()) >= ' ') s[p++] = c;
+    s[p] = '\0'; return p;
+}

source/Misc/NegDiv.cpp

@@ -0,0 +1,7 @@
+#define div _div
+ll div(ll A, ll B)
+{
+    ll q = A/B;
+    if(A<0) q-=(B>0)-(B<0);
+    return q;
+}

source/Misc/mt19937.cpp

@@ -0,0 +1,7 @@
+const long long rand_L = 1;
+const long long rand_R = 10;
+mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
+uniform_int_distribution<int> dist(rand_L, rand_R);
+auto gen = bind(dist, rng);
+
+gen(); gen(); gen();