Submission #775156

#	Time	Username	Problem	Language	Result	Execution time	Memory
775156		vjudge1	Rack (eJOI19_rack)	C++17	100 / 100	6 ms	7928 KiB

rack

#include <bits/stdc++.h>

using namespace std;

typedef long long lo; 

#define fi first
#define se second
#define int long long
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 1000000000;
const lo li = 1000005;
const lo mod = 1000000007;

int n,m,a[li],k,flag,t,pw[li];
int cev;
string s;
vector<int> v;

inline int add(int x,int y){
	if(x+y>=mod)return x+y-mod;
	return x+y;
}

inline int mul(int x,int y){
	return (x%mod)*(y%mod)%mod;
}

int32_t main(void){
	scanf("%lld %lld",&n,&m);
	pw[0]=1;
	for(int i=1;i<=n;i++)pw[i]=add(pw[i-1],pw[i-1]);
	cev=1;
	for(int i=n-1;i>=0;i--){
		if(m%2==0)cev=add(cev,pw[i]);
		m=(m+1)/2;
	}
	printf("%lld\n",cev);
	return 0;
}

Compilation message (stderr)

rack.cpp: In function 'int32_t main()':
rack.cpp:36:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |  scanf("%lld %lld",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 60 / 60