Submission #199773

#	Time	Username	Problem	Language	Result	Execution time	Memory
199773		SamAnd	Popcount (COCI19_popcount)	C++17	0 / 110	18 ms	376 KiB

popcount

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

int n, k;

vector<int> gum(vector<int> a, vector<int> b)
{
    vector<int> ans;
    reverse(a.begin(), a.end());
    reverse(b.begin(), b.end());
    while (a.size() < b.size())
        a.push_back(0);
    while (b.size() < a.size())
        b.push_back(0);
    int m = 0;
    for (int i = 0; i < a.size(); ++i)
    {
        ans.push_back((a[i] + b[i] + m) % 10);
        m = (a[i] + b[i] + m) / 10;
    }
    ans.push_back(m);
    while (ans.back() == 0)
        ans.pop_back();
    reverse(ans.begin(), ans.end());
    return ans;
}

void tp(vector<int> v)
{
    if (v.empty())
        v.push_back(0);
    for (int i = 0; i < v.size(); ++i)
        cout << v[i];
}

void solv4()
{
    int q;
    for (int i = 0; i < k; ++i)
    {
        for (int j = 0; j < n; ++j)
        {
            if ((j & (1 << i)))
            {
                q = i;
                break;
            }
        }
        if (q != i)
            break;
    }
    ++q;
    cout << q << endl;
    for (int i = 0; i < q; ++i)
    {
        vector<int> v1, v2;
        vector<int> ast = {1};
        for (int j = 0; j < n; ++j)
        {
            if ((j & (1 << i)) == 0)
            {
                v1 = gum(v1, ast);
            }
            else
            {
                v2 = gum(v2, ast);
            }
            ast = gum(ast, ast);
        }
        cout << "A=((";
        tp(v1);
        cout << "&A)+((";
        tp(v2);
        cout << "&A)>>" << (i + 1) << "))\n";
    }
}

int main()
{
    cin >> n >> k;
    if (n == 1)
    {
        cout << "0\n";
        return 0;
    }
    solv4();
    return 0;
}

Compilation message (stderr)

popcount.cpp: In function 'std::vector<int> gum(std::vector<int>, std::vector<int>)':
popcount.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a.size(); ++i)
                     ~~^~~~~~~~~~
popcount.cpp: In function 'void tp(std::vector<int>)':
popcount.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < v.size(); ++i)
                     ~~^~~~~~~~~~
popcount.cpp: In function 'void solv4()':
popcount.cpp:38:9: warning: 'q' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int q;
         ^

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 35
• Subtask 4: 0 / 45