Submission #983336

#	Time	Username	Problem	Language	Result	Execution time	Memory
983336		canadavid1	Sequence (BOI14_sequence)	C++14	100 / 100	125 ms	2440 KiB

sequence

#include <iostream>
#include <vector>
#include <bitset>
#include <string>


using digits = std::bitset<10>;
using u64 = unsigned long long;


u64 min_valid(std::vector<digits> v)
{
    if(v.size()==0) return 0;
    if(v.size()==1)
    {
        auto w = v[0];
        u64 o = 0;
        if(w.none()) return 0;
        if(w.count()==1 && w[0]) return 10;
        int i = 1;
        while(!w[i]) i++;
        o = i;
        w[i] = 0;
        if(w[0]) o *= 10;
        for(int i = 1; i < 10; i++)
        {
            if(!w[i]) continue;
            o *= 10;
            o += i;
        }
        return o;
    }
    u64 min = (u64)-1;
    for(u64 ls = 0; ls < 10; ls++)
    {
        std::vector<digits> n;
        auto k = ls;
        n.emplace_back();
        for(int i = 0; i < v.size(); i++)
        {
            auto r = v[i];
            r[k] = 0;
            n.back() |= r;
            if(++k==10)
            {
                k = 0;
                n.emplace_back();
            }
        }
        while(n.size()&&n.back().none()) n.pop_back();
        if(n == v) continue;
        auto a = min_valid(n);
        if(a==0 && ls == 0 && v[0][0]) a++;
        min = std::min(10*a+ls,min);
    }
    return min;
}

u64 brute_force(std::vector<digits> v)
{
    for(int i = 0; i < 1e6; i++)
    {
        bool kl = 1;
        for(int k = 0; k < v.size(); k++)
        {
            auto s = std::to_string(i+k);
            bool f = false;
            for (auto j : s) f |= v[k][j-'0'];
            if(!f) {kl=0;break;};
        }
        if(kl) return i;
    }
    return -1;
}

int main()
{
    int K;
    std::cin >> K;
    std::vector<digits> v(K);
    for(auto& i : v) {int j; std::cin >> j; i[j]=1;}
    auto a = min_valid(v);
  	std::cout << a << "\n";
}

Compilation message (stderr)

sequence.cpp: In function 'u64 min_valid(std::vector<std::bitset<10> >)':
sequence.cpp:39:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::bitset<10> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         for(int i = 0; i < v.size(); i++)
      |                        ~~^~~~~~~~~~
sequence.cpp: In function 'u64 brute_force(std::vector<std::bitset<10> >)':
sequence.cpp:64:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::bitset<10> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |         for(int k = 0; k < v.size(); k++)
      |                        ~~^~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 33 / 33
• Subtask 3: 25 / 25
• Subtask 4: 33 / 33