Submission #99328

#	Time	Username	Problem	Language	Result	Execution time	Memory
99328		karma	Cave (IOI13_cave)	C++11	12 / 100	440 ms	528 KiB

cave

#include "cave.h"
#include<bits/stdc++.h>

using namespace std;

const int maxN = 5007;
int n, s[maxN], d[maxN], vis[maxN];

//tryCombination(s[])
//answer(s[], d[])

bool Chk(int mid, int i)
{
     for(int i = 0; i < n; ++i) {
        if(!vis[i]) {
            if(mid) --mid, s[i] = 1;
            else s[i] = 0;
        }
     }
     int door = tryCombination(s);
     return door == -1 || door > i;
}

void exploreCave(int sz)
{
     n = sz;
     fill_n(s, n + 1, 0);
     fill_n(vis, n + 1, 0);
     for(int i = 0; i < n; ++i) {
        int cur = tryCombination(s);
        bool open = 0;
        if(cur == -1 || cur > i) open = 1;
        int low = 1, high = n - i;
        while(low <= high) {
            int mid = (low + high) / 2;
            if(Chk(mid, i) != open) high = mid - 1;
            else low = mid + 1;
        }
        (open? s[i] = 0: s[i] = 1);
        for(int j = 0; j < n; ++j) {
           if(!vis[j]) --low;
           if(!low) {d[i] = j, vis[j] = 1; break;}
        }
     }
     answer(s, d);
}

• Subtask 1: 12 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24