結果

問題 No.1869 Doubling?
ユーザー akua
提出日時 2022-03-11 22:17:33
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 52 ms / 2,000 ms
コード長 7,997 bytes
コンパイル時間 1,430 ms
コンパイル使用メモリ 129,524 KB
最終ジャッジ日時 2025-01-28 08:43:42
ジャッジサーバーID
(参考情報)
judge2 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 43
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <iostream> // cout, endl, cin
#include <string> // string, to_string, stoi
#include <vector> // vector
#include <algorithm> // min, max, swap, sort, reverse, lower_bound, upper_bound
#include <utility> // pair, make_pair
#include <tuple> // tuple, make_tuple
#include <cstdint> // int64_t, int*_t
#include <cstdio> // printf
#include <map> // map
#include <queue> // queue, priority_queue
#include <set> // set
#include <stack> // stack
#include <deque> // deque
#include <unordered_map> // unordered_map
#include <unordered_set> // unordered_set
#include <bitset> // bitset
#include <cctype> // isupper, islower, isdigit, toupper, tolower
#include<math.h>
#include <iomanip>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repi(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
using namespace std;
typedef long long ll;
//const long long mod=1000000007;
//const long long mod2=998244353;
using ll=long long;
const ll inf=1e18+1;
using P= pair<ll, ll>;
const int MAX = 10000;
//
const int MOD = 1e9+7;
//
ll fact[MAX], inv_fact[MAX], inv[MAX];
//
void init() {
// 1
fact[0] = 1;
fact[1] = 1;
inv[0] = 1;
inv[1] = 1;
inv_fact[0] = 1;
inv_fact[1] = 1;
//
repi(i, 2, MAX){
//
fact[i] = fact[i - 1] * i % MOD;
//
inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
//
inv_fact[i] = inv_fact[i - 1] * inv[i] % MOD;
}
}
//
ll nCk(int n, int k) {
ll x = fact[n]; // n!
ll y = inv_fact[n-k]; // (n-k)!
ll z = inv_fact[k]; // k!
if (n < k) return 0; //
if (n < 0 || k < 0) return 0; //
return x * ((y * z) % MOD) % MOD; //
}
ll pow_pow(ll x,ll n,ll mod){
if(n==0) return 1;
x%=mod;
ll res=pow_pow(x*x%mod,n/2,mod);
if(n&1)res=res*x%mod;
return res;
}
int extgcd(int a,int b,int &x,int &y){
int d=a;
if(b!=0){
d=extgcd(b,a%b,y,x);
y-=(a/b)*x;
}else{
x=1;y=0;
}
return d;
}
int mod_inverse(int a,int m){
int x,y;
extgcd(a,m,x,y);
return (m+x%m)%m;
}
struct UnionFind {
vector<int> par, siz;
UnionFind(int n) : par(n, -1) , siz(n, 1) { }
//
int root(int x) {
if (par[x] == -1) return x;
else return par[x] = root(par[x]);
}
// x y ()
bool issame(int x, int y) {
return root(x) == root(y);
}
// x y
bool unite(int x, int y) {
x = root(x), y = root(y);
if (x == y) return false;
if (siz[x] < siz[y]) swap(x, y);
par[y] = x;
siz[x] += siz[y];
return true;
}
// x
int size(int x) {
return siz[root(x)];
}
};
//min(x,y)0max(x,y)
//
ll gcd(ll x,ll y){
if(y==0)return x;
return gcd(y,x%y);
}
//
ll lcm(ll x,ll y){
return ll(x/gcd(x,y))*y;
}
template<class T> bool chmin(T& a, T b) {
if (a > b) {
a = b;
return true;
}
else return false;
}
template<class T> bool chmax(T& a, T b) {
if (a < b) {
a = b;
return true;
}
else return false;
}
//using Graph1=vector<vector<Edge> >;
//using Graph=vector<vector<int> >;
// auto mod int
// https://youtu.be/L8grWxBlIZ4?t=9858
// https://youtu.be/ERZuLAxZffQ?t=4807 : optimize
// https://youtu.be/8uowVvQ_-Mo?t=1329 : division
const ll mod =1e9+7;
struct mint {
ll x; // typedef long long ll;
mint(ll x=0):x((x%mod+mod)%mod){}
mint operator-() const { return mint(-x);}
mint& operator+=(const mint a) {
if ((x += a.x) >= mod) x -= mod;
return *this;
}
mint& operator-=(const mint a) {
if ((x += mod-a.x) >= mod) x -= mod;
return *this;
}
mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
mint operator+(const mint a) const { return mint(*this) += a;}
mint operator-(const mint a) const { return mint(*this) -= a;}
mint operator*(const mint a) const { return mint(*this) *= a;}
mint pow(ll t) const {
if (!t) return 1;
mint a = pow(t>>1);
a *= a;
if (t&1) a *= *this;
return a;
}
// for prime mod
mint inv() const { return pow(mod-2);}
mint& operator/=(const mint a) { return *this *= a.inv();}
mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
// combination mod prime
// https://www.youtube.com/watch?v=8uowVvQ_-Mo&feature=youtu.be&t=1619
struct combination {
vector<mint> fact, ifact;
combination(int n):fact(n+1),ifact(n+1) {
//assert(n < mod);
fact[0] = 1;
for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
ifact[n] = fact[n].inv();
for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
}
mint operator()(int n, int k) {
if (k < 0 || k > n) return 0;
return fact[n]*ifact[k]*ifact[n-k];
}
mint p(int n, int k) {
return fact[n]*ifact[n-k];
}
} c(1000005);
//const ll INF=1e18;
class segment_tree {
private:
int sz;
std::vector<int> seg;
std::vector<int> lazy;
void push(int k) {
if (k < sz) {
lazy[k * 2] = max(lazy[k * 2], lazy[k]);
lazy[k * 2 + 1] = max(lazy[k * 2 + 1], lazy[k]);
}
seg[k] = max(seg[k], lazy[k]);
lazy[k] = 0;
}
void update(int a, int b, int x, int k, int l, int r) {
push(k);
if (r <= a || b <= l) return;
if (a <= l && r <= b) {
lazy[k] = x;
push(k);
return;
}
update(a, b, x, k * 2, l, (l + r) >> 1);
update(a, b, x, k * 2 + 1, (l + r) >> 1, r);
seg[k] = max(seg[k * 2], seg[k * 2 + 1]);
}
int range_max(int a, int b, int k, int l, int r) {
push(k);
if (r <= a || b <= l) return 0;
if (a <= l && r <= b) return seg[k];
int lc = range_max(a, b, k * 2, l, (l + r) >> 1);
int rc = range_max(a, b, k * 2 + 1, (l + r) >> 1, r);
return max(lc, rc);
}
public:
segment_tree() : sz(0), seg(), lazy() {};
segment_tree(int N) {
sz = 1;
while (sz < N) {
sz *= 2;
}
seg = std::vector<int>(sz * 2, 0);
lazy = std::vector<int>(sz * 2, 0);
}
void update(int l, int r, int x) {
update(l, r, x, 1, 0, sz);
}
int range_max(int l, int r) {
return range_max(l, r, 1, 0, sz);
}
//cin.tie(0);
//ios_base::sync_with_stdio(false); main
};
const ll seg_size=200100;
ll seg[seg_size*2];
ll seg2[seg_size*2];
void seg_set(ll l,ll r,ll v){
l+=seg_size;
r+=seg_size;
while(l<r){
if(l%2==1){
chmin(seg[l],v);
l++;
}
l/=2;
if(r%2==1){
chmin(seg[r-1],v);
r--;
}
r/=2;
}
}
ll seg_take(ll ind){
ind+=seg_size;
ll ans=inf;
while(ind>0){
ind/=2;
chmin(ans,seg[ind]);
}
return ans;
}
struct Edge{
int to;ll id;
Edge(int to,ll id):to(to),id(id){}
};
ll extgcd(ll a,ll b,ll &x,ll &y){
ll d=a;
if(b!=0){
d=extgcd(b,a%b,y,x);
y-=(a/b)*x;
}
else{
x=1;y=0;
}
return d;
}
using graph = vector<vector<ll> > ;
int vx[]={0,-1,0,1},vy[]={-1,0,1,0};
void comp(vector<ll>&a){
set<ll>s(a.begin(),a.end());
map<ll,ll>d;
int cnt=0;
for(auto x:s)d[x]=cnt++;
for(auto&x:a)x=d[x];
}
int main(){
ll n,m; cin >> n >> m;
ll now=1;
bool can=false;
rep(i,n-1){
now*=2;
if(now>m){
now/=2;
can=true;
break;
}
}
if(!can)m=now;
ll ans=0;
ll cnt=0;
while(m){
ans+=m;
m=(m+1)/2;
cnt++;
if(m==1)break;
}
ans+=n-cnt;
cout << ans << endl;
}
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