| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 120807 | shashwatchandra | Cave (IOI13_cave) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/*input
*/
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "cave.h"
using namespace std;
using namespace __gnu_pbds;
#define double long double
#define f first
#define s second
#define mp make_pair
#define pb push_back
#define RE(i,n) for (int i = 1; i <= n; i++)
#define RED(i,n) for (int i = n; i > 0; i--)
#define REPS(i,n) for(int i = 1; (i*i) <= n; i++)
#define REP(i,n) for (int i = 0; i < (int)n; i++)
#define FOR(i,a,b) for (int i = a; i < b; i++)
#define REPD(i,n) for (int i = n-1; i >= 0; i--)
#define FORD(i,a,b) for (int i = a; i >= b; i--)
#define all(v) v.begin(),v.end()
#define pii pair<int,int>
#define vi vector<int>
#define vvi vector<vi>
#define print(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout << *it << " "; cout << endl;
#define debug(x) cout << x << endl;
#define debug2(x,y) cout << x << " " << y << endl;
#define debug3(x,y,z) cout << x << " " << y << " " << z << endl;
typedef tree<
int,
null_type,
less<int>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;
const int INF = 1e18+1;
const int MOD = 1e9+7;
const double PI = 3.14159265358979323846264338;
int raise(int a,int n,int m = MOD){
if(n == 0)return 1;
if(n == 1)return a;
int x = 1;
x *= raise(a,n/2,m);
x %= m;
x *= x;
x %= m;
if(n%2)x*= a;
x %= m;
return x;
}
int floor1(int n,int k){
if(n%k == 0 || n >= 0)return n/k;
return (n/k)-1;
}
int ceil1(int n,int k){
return floor1(n+k-1,k);
}
void exploreCave(int N){
int stick[N];
int cur[N];
int door[N];
int aux[N];
REP(i,N){
stick[i] = 0;
aux[i] = 0;
cur[i] = 0;
}
int find = 0;
while(find < N){
int rightnow = tryCombination(cur);
if(rightnow == -1)rightnow = N+1;
int lo = 0;
int hi = N-1;
if(rightnow > find){
//look for first i such that rightnow becomes find
while(lo < hi){
int mid = (lo+hi)/2;
REP(i,mid+1){
if(!stick[i])aux[i] = cur[i]^1;
}
REP(mid+1,N){
aux[i] = cur[i];
}
int lookwhatyoumademedo = tryCombination(aux);
if(lookwhatyoumademedo == -1)lookwhatyoumademedo = N+1;
if(lookwhatyoumademedo == find)hi = mid;
else lo = mid+1;
}
}
else{
// look for first i such that rightnow becomes more than find
while(lo < hi){
int mid = (lo+hi)/2;
REP(i,mid+1){
if(!stick[i])aux[i] = cur[i]^1;
}
REP(mid+1,N){
aux[i] = cur[i];
}
int lookwhatyoumademedo = tryCombination(aux);
if(lookwhatyoumademedo == -1)lookwhatyoumademedo = N+1;
if(lookwhatyoumademedo > find)hi = mid;
else lo = mid+1;
}
}
//now lo'th switch corresponds to door find
door[lo] = find;
stick[lo] = 1;
REP(i,lo+1){
if(!stick[i])cur[i] = cur[i]^1;
}
find++;
}
answer(cur,door);
}