CodeForces 722D Generating Sets

Posted 2020-08-12 Fighting Heart

贪心，优先队列。

每次变最大的数，变到最大的能变的一个就停止。如果发现最大的数不能变小，那么输出。

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<iostream>
using namespace std;
typedef long long LL;
const double pi=acos(-1.0),eps=1e-6;
void File()
{
    freopen("D:\\in.txt","r",stdin);
    freopen("D:\\out.txt","w",stdout);
}
template <class T>
inline void read(T &x)
{
    char c = getchar();
    x = 0;
    while(!isdigit(c)) c = getchar();
    while(isdigit(c)) { x = x * 10 + c - ‘0‘; c = getchar(); }
}

priority_queue<int>q;
map<int,bool>m;
int n;

int main()
{
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        int x; scanf("%d",&x);
        q.push(x); m[x]=1;
    }

    while(1)
    {
        int top=q.top();

        while(1)
        {
            if(top==0) break;
            if(m[top]) top=top/2;
            else break;
        }

        if(top==0) break;

        q.pop();
        m[top]=1;
        q.push(top);
    }

    while(!q.empty())
    {
        printf("%d ",q.top());
        q.pop();
    }
    return 0;
}