Submission #99334

#	Time	Username	Problem	Language	Result	Execution time	Memory
99334		karma	Cave (IOI13_cave)	C++11	100 / 100	794 ms	640 KiB

cave

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

using namespace std;

const int maxN = 5007;
const int MAX_CALLS = 70000;
int n, s[maxN], d[maxN], vis[maxN];
//int realS[maxN], realD[maxN], inv[maxN];
//int num_calls;
//
//void answer(int S[], int D[]) {
//    int i;
//    bool correct = 1;
//    for (i = 0; i < n; ++i)
//        if (S[i] != realS[i] || D[i] != realD[i]) {
//            correct = 0;
//            break;
//        }
//    if (correct) cout << "CORRECT\n";
//    else {
//        cout << "INCORRECT\n";
//        for(int i = 0; i < n; ++i) {
//            cout << realS[i] << ' ';
//        }
//        cout << '\n';
//        for(int i = 0; i < n; ++i) {
//            cout << realD[i] << ' ';
//        }
//    }
//    exit(0);
//}
//
//int tryCombination(int S[]) {
//    int i;
//
//    if (num_calls >= MAX_CALLS) {
//        cout << "INCORRECT\nToo many calls to tryCombination().\n"; exit(0);
//    }
//    ++num_calls;
//    for (i = 0; i < n; ++i)
//        if (S[inv[i]] != realS[inv[i]])
//            return i;
//    return -1;
//}
//
//int init()
//{
//    srand(time(0));
//    int n = rand() % 10;
//    for(int i = 0; i < n; ++i) realS[i] = rand() % 2, realD[i] = i;
//    random_shuffle(realD, realD + n);
//    for(int i = 0; i < n; ++i) inv[realD[i]] = i;
//    return n;
//}

bool Chk(int mid, int pos)
{
     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 > pos;
}

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 = 0, high = n - i;
        while(low <= high) {
            int mid = (low + high) / 2;
            if(Chk(mid, i) != open) high = mid - 1;
            else low = mid + 1;
        }
        for(int j = 0; j < n; ++j) {
           if(!vis[j]) --low, s[j] = 0;
           if(!low) {
              open? s[j] = 0: s[j] = 1;
              d[j] = i, vis[j] = 1; break;
           }
        }
     }
     answer(s, d);
}
//
//int main() {
//    int n;
//	n = init();
//    exploreCave(n);
//    printf("INCORRECT\nYour solution did not call answer().\n");
//    return 0;
//}

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