Submission #580712

#	Time	Username	Problem	Language	Result	Execution time	Memory
580712		Omar_Elgedawy	Lost in the cycle (IOI19_cycle)	C++17	0 / 100	1 ms	208 KiB

cycle

#include <bits/stdc++.h>
#include "cycle.h"
using namespace std;

void escape(int n) {
	if(jump(0)){
		int loc=0,one=0;
		int l=n/2,r=n-1;
		int lst=0;
		while(l<=r){
			int m=(r+l)/2;
			int dist;
			if(m>loc)
				dist=m-loc;
			else
				dist=(n-loc)+m;
			loc=(loc+dist)%n;
			// cout<<l<<' '<<r<<' '<<m<<' '<<dist<<' '<<loc<<endl;
			if(jump(dist)){
				r=m-1;
				one=loc;
				lst=0;
			}
			else{
				lst=n-loc+1;
				l=m+1;
			}
		}
		// cout<<loc<<' '<<one;
		if(loc<one)
			jump(one-loc);
		else if(loc>one)
			jump((n-loc)+one);
		jump(n/2);
	}
	else{
		int loc=0,one;
		int l=1,r=n/2+1;
		int lst=0;
		while(l<=r){
			int m=(r+l)/2;
			int dist;
			if(m>loc)
				dist=m-loc;
			else
				dist=(n-loc)+m;
			loc=(loc+dist)%n;
			// cout<<l<<' '<<r<<' '<<m<<' '<<dist<<' '<<loc<<endl;
			if(jump(dist)){
				r=m-1;
				one=loc;
				lst=0;
			}
			else{
				lst=n-loc+1;
				l=m+1;
			}
		}
		// cout<<loc<<' '<<one;
		if(loc<one)
			jump(one-loc);
		else if(loc>one)
			jump((n-loc)+one);
		jump(n/2);
	}
}

Compilation message (stderr)

cycle.cpp: In function 'void escape(int)':
cycle.cpp:9:7: warning: variable 'lst' set but not used [-Wunused-but-set-variable]
    9 |   int lst=0;
      |       ^~~
cycle.cpp:39:7: warning: variable 'lst' set but not used [-Wunused-but-set-variable]
   39 |   int lst=0;
      |       ^~~
cycle.cpp:62:8: warning: 'one' may be used uninitialized in this function [-Wmaybe-uninitialized]
   62 |   else if(loc>one)
      |        ^~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 33
• Subtask 3: 0 / 56