codeforces-305A Strange Addition

本文解析了一个关于特殊加法的问题,即只有当两个数在同一位置上至少有一个包含0时才能相加。通过理解题意,采用暴力求解策略找到满足条件的所有数,并给出了详细的代码实现。

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题目链接:点击打开链接

之前一直理解错题意,以为两个数字里面任意一个数含有0就能相加,结果各种wa。。。

其实题目说的意思是两个数如果在任意十进制位至少有一个数含有0才可以相加,比如505和50可以相加(50可以看成050,在个十百位上505和050这两个数至少一方含有0),而50和25不能相加(在十位上两方都不含有0),理解清楚题意后直接暴力求解就可以了


#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<algorithm>
using namespace std;
const int inf=0x3f3f3f3f;
const int maxn=105;
int a[maxn];
int ans[maxn];
bool vis[maxn];

int main()
{
    int n;
    while(cin>>n)
    {
        memset(vis,false,sizeof vis);
        int maxpos=-1,low=inf;
        int num=0;
        for(int i=0;i<n;i++)
        {
            scanf("%d",a+i);
            int temp=a[i],t=0;
            while(temp)
            {
                temp/=10;
                t++;
            }
            maxpos=max(maxpos,t);
            if(a[i]==0)
            {
                ans[num++]=a[i];
                maxpos=max(maxpos,1);
                //low=min(low,1);
            }
        }
        //cout<<"maxpos="<<maxpos<<endl;
        for(int i=0;i<maxpos;i++)
        {
            for(int j=0;j<n;j++)
            {
                if(vis[j]) continue;
                int temp=a[j];
                for(int k=0;k<i;k++)
                    temp/=10;
                if(temp!=0&&temp%10==0)
                {
                    temp/=10;
                    bool flag=true;
                    while(temp)
                    {
                        if(temp%10==0) { flag=false; break; }
                        temp/=10;
                    }
                    if(flag)
                    {
                        low=min(low,i+1);
                        ans[num++]=a[j];
                        vis[j]=true;
                        break;
                    }
                }
            }
        }
        //cout<<"low="<<low<<endl;
        if(num==0)
        {
            puts("1");
            printf("%d\n",a[0]);
            continue;
        }
        for(int i=0;i<n;i++)
        {
            int temp=a[i],t=0,k=0;
            if(a[i]==0) continue;
            while(temp)
            {
                if(temp%10) k++;
                temp/=10;
                t++;
            }
            if(t==k&&k<=low)
            {
                ans[num++]=a[i];
                break;
            }
        }
        printf("%d\n",num);
        for(int i=0;i<num;i++)
        {
            if(i==0) printf("%d",ans[i]);
            else printf(" %d",ans[i]);
            if(i==num-1) puts("");
        }
    }
    return 0;
}


### Codeforces Problem 976C Solution in Python For solving problem 976C on Codeforces using Python, efficiency becomes a critical factor due to strict time limits aimed at distinguishing between efficient and less efficient solutions[^1]. Given these constraints, it is advisable to focus on optimizing algorithms and choosing appropriate data structures. The provided code snippet offers insight into handling string manipulation problems efficiently by customizing comparison logic for sorting elements based on specific criteria[^2]. However, for addressing problem 976C specifically, which involves determining the winner ('A' or 'B') based on frequency counts within given inputs, one can adapt similar principles of optimization but tailored towards counting occurrences directly as shown below: ```python from collections import Counter def determine_winner(): for _ in range(int(input())): count_map = Counter(input().strip()) result = "A" if count_map['A'] > count_map['B'] else "B" print(result) determine_winner() ``` This approach leverages `Counter` from Python’s built-in `collections` module to quickly tally up instances of 'A' versus 'B'. By iterating over multiple test cases through a loop defined by user input, this method ensures that comparisons are made accurately while maintaining performance standards required under tight computational resources[^3]. To further enhance execution speed when working with Python, consider submitting codes via platforms like PyPy instead of traditional interpreters whenever possible since they offer better runtime efficiencies especially important during competitive programming contests where milliseconds matter significantly.
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