Submission #307954

#	Time	Username	Problem	Language	Result	Execution time	Memory
307954		sean9892	Lost in the cycle (IOI19_cycle)	C++14	100 / 100	1 ms	384 KiB

cycle

#include "cycle.h"

int distance(int pos,int tar,int n){
	return (tar-pos+n)%n;
}

void escape(int n) {
	int pos=0;
	int N;
	N=n/2*2;
	if(n&1){
		bool x=jump(distance(pos,N,n));
		pos=N;
		bool y=jump(1);
		pos=0;
		if(x&&!y){
			jump(N);
			return;
		}
	}
	int l=0,r=N;
	while(l<r){
		int m=l+r>>1;
		bool x=jump(distance(pos,m,n));
		pos=m;
		if(x){
			l=m;
		}
		else{
			r=m;
		}
		if(r-l<=3){
			break;
		}
	}
	int i;
	for(i=r-1;i>=l;i--){
		bool x=jump(distance(pos,i,n));
		pos=i;
		if(x){
			break;
		}
	}
}

Compilation message (stderr)

cycle.cpp: In function 'void escape(int)':
cycle.cpp:23:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |   int m=l+r>>1;
      |         ~^~

• Subtask 1: 11 / 11
• Subtask 2: 33 / 33
• Subtask 3: 56 / 56