Submission #849818

#	Time	Username	Problem	Language	Result	Execution time	Memory
849818		JooDdae	Cave (IOI13_cave)	C++17	100 / 100	219 ms	848 KiB

cave

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

void exploreCave(int N) {
    int a[N], b[N], c[N];
    for(int i=0;i<N;i++) a[i] = b[i] = c[i] = -1;

    for(int i=0;i<N;i++) {
        vector<int> v;
        for(int j=0;j<N;j++) a[j] = b[j];

        for(int j=0;j<N;j++) if(a[j] == -1) {
            a[j] = 0, v.push_back(j);
        }
        int re = tryCombination(a);

        int flag = (re < 0 || re > i ? 0 : 1);
        for(int x : v) a[x] = flag;

        // for(int x : v) {
        //     a[x] = !flag;
        //     re = tryCombination(a);
        //     if(-1 < re && re <= i) {
        //         c[x] = i;
        //         b[x] = a[x] = flag;
        //         break;
        //     }
        //     a[x] = flag;
        // }

        while(v.size() > 1) {
            int mid = v.size()/2;

            for(int i=0;i<v.size();i++) a[v[i]] = (i < mid) ^ flag;
            int re = tryCombination(a);
            for(int i=0;i<v.size();i++) a[v[i]] = flag;

            if(re == -1 || re > i) v = vector(v.begin()+mid, v.end());
            else v = vector(v.begin(), v.begin()+mid);
        }

        c[v[0]] = i, b[v[0]] = a[v[0]] = flag;
    }

    answer(b, c);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:35:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |             for(int i=0;i<v.size();i++) a[v[i]] = (i < mid) ^ flag;
      |                         ~^~~~~~~~~
cave.cpp:37:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |             for(int i=0;i<v.size();i++) a[v[i]] = flag;
      |                         ~^~~~~~~~~

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