Submission #839282

#	Time	Username	Problem	Language	Result	Execution time	Memory
839282		Alfraganus	Cave (IOI13_cave)	C++17	13 / 100	206 ms	424 KiB

cave

#include "cave.h"
// #include "grader.c"
#include <vector>
using namespace std;

bool used[5001];
int bits[5001], a[5001];

bool check(int l, int r){
    for(int i = l; i <= r; i ++)
        if(!used[i])
            return false;
    return true;
}

void color(int l, int r, int x){
    for(int i = l; i <= r; i ++)
        if(!used[i])
            bits[i] = x;
}

void exploreCave(int n){
    for(int i = 0; i < n; i ++){
        int l = 0, r = n - 1;
        int x = -1;
        while(l < r){
            int m = (l + r) >> 1;
            if(check(l, m))
                l = m + 1;
            else if(check(m + 1, r))
                r = m;
            else{
                color(l, m, 0);
                color(m + 1, r, 1);
                int k = tryCombination(bits);
                // printf("%d ", l);
                // printf("%d ", m);
                // printf("%d ", r);
                // printf("%d ", x);
                // printf("%d ", k);
                // for(int i = 0; i < n; i ++)
                //     printf("%d ", bits[i]);
                // printf("\n");
                if(x == -1){
                    if(k > i or k == -1){
                        color(m + 1, r, 0);
                        int k = tryCombination(bits);
                        if(k > i or k == -1)
                            x = 0, r = m;
                        else
                            x = 1, l = m + 1;
                    }
                    else{
                        color(m + 1, r, 0);
                        int k = tryCombination(bits);
                        if (k > i or k == -1)
                            x = 0, l = m + 1;
                        else
                            x = 1, r = m;
                    }
                }
                else{
                    if(x == 0){
                        if(k > i or k == -1)
                            r = m;
                        else
                            l = m + 1;
                    }
                    else{
                        if(k > 1 or k == -1)
                            l = m + 1;
                        else
                            r = m;
                    }
                }
            }
        }
        if(i == n - 1){
            color(0, n - 1, 0);
            x = 0;
            if(tryCombination(bits) != -1)
                x = 1;
        }
        used[l] = true;
        bits[l] = x;
        a[l] = i;
    }
    answer(bits, a);
}

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