Submission #280257

#	Time	Username	Problem	Language	Result	Execution time	Memory
280257		antontsiorvas	Rack (eJOI19_rack)	C++14	100 / 100	6 ms	416 KiB

rack

#include <cstdio>

int ans[1000005];

void f(int n, long long int coats){
	if(n == 0 || coats == 1) return;
	if(coats%2) ans[n] = 1;
	else ans[n] = 2;
	return f(n-1,coats-coats/2);
}

int main(){
	int N, MOD = 1000000007;
	long long int K, pos=1, jump=1;
	scanf("%d%lld",&N,&K);
	f(N,K);
	for(int i=1; i<=N; i++){
		if(ans[i] == 2) pos += jump;
		pos %= MOD;
		jump %= MOD;
		jump *= 2; 
	}
	printf("%lld",pos);
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:15:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |  scanf("%d%lld",&N,&K);
      |  ~~~~~^~~~~~~~~~~~~~~~

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