标签:return int mid back vector template size
template
basic
binary search
int bsearch_1 (int l, int r) {
int mid = l + r >> 1;
while (l < r) {
if (check (mid)) {
r = mid;
} else {
l = mid + 1;
}
}
return l;
}
int bsearch_2 (int l, int r) {
int mid = l + r + 1 >> 1;
while (l < r) {
if (check (mid)) {
l = mid;
} else {
r = mid - 1;
}
}
return l;
}
double bsearch_3 (double l, double r) {
const double eps = 1e-6;
while (r - l > eps) {
double mid = (l + r) / 2;
if (check (mid)) {
r = mid;
} else {
l = mid;
}
}
return l;
}
arbitrary-precision arithmetic
vector <int> add (vector <int> &A, vector <int> &B) {
if (A.size () - B.size ()) {
return add (B, A);
}
vector <int> C;
int t = 0;
for (int i = 0; i < A.size (); i ++ ) {
t += A[i];
if (i < B.size ()) {
t += B[i];
}
C.push_back (t % 10);
t /= 10;
}
if (t) {
C.push_back (t);
}
return C;
}
bool cmp (vector <int> &A, vector <int> &B) {
if (A.size () < B.size ()) {
return false;
}
for (int i = A.size () - 1; i >= 0; i -- ) {
if (A[i] != B[i]) {
return A[i] > B[i];
}
}
return true;
}
vector <int> sub (vector <int> &A, vector <int> &B) {
vector <int> C;
int t = 0;
for (int i = 0; i < A.size (); i ++ ) {
t = A[i] - t;
if (i < B.size ()) {
t -= B[i];
}
C.push_back ((t + 10) % 10);
if (t < 0) {
t = 1;
} else {
t = 0;
}
}
while (C.size () > 1 && C.back () == 0) {
C.pop_back ();
}
return C;
}
vector <int> mul (vector <int> &A, int b) {
vector <int> C;
int t = 0;
for (int i = 0; i < A.size () || t; i ++ ) {
if (i < A.size ()) {
t += A[i] * b;
}
C.push_back (t % 10);
t /= 10;
}
while (C.size () > 1 && C.back () == 0) {
C.pop_back ();
}
return C;
}
math
decompose prime factors
unordered_map <int, int> primes;
for (int i = 2; i <= x / i; i ++ ) {
while (x % i == 0) {
x /= i;
primes[i] ++ ;
}
if (x > 1) {
primes[x] ++ ;
}
}
quickpow
int qmi (int a, int b) {
LL res = 1;
while (b) {
if (b & 1) {
res = (LL)res * a % mod;
}
a = (LL)a * a % mod;
b >>= 1;
}
return res;
}
标签:return,int,mid,back,vector,template,size 来源: https://www.cnblogs.com/lucius7/p/16391708.html
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