C++14 解法, 执行用时: 2ms, 内存消耗: 376KB, 提交时间: 2020-07-28

#include<stdio.h>
#define MAX 50000
int main()
{
    int i,j,num=0;
    int temp=0;
    int head = 0,tail=0;
    char a[MAX];
    scanf("%s",a);
    while(a[i++]=='1')
    {
        head++;
    }
      
    while(a[i]!='\0')
    {
        if(a[i]=='1')
        {
            temp++;
            tail++;
        } 
        else if(a[i]=='0')
        {
            temp = 0;
            tail = 0;
        }
        if(num<temp)
        {
            num = temp;
        }
        i++;
    }
    if(head!=0)
    {
        temp = tail+head;
        if(temp>num)
            num = temp;
    }
    printf("%d",num);
    return 0;
}

C++14 解法, 执行用时: 2ms, 内存消耗: 500KB, 提交时间: 2020-04-27

#include<stdio.h>
#define MAX 50000
int main()
{
    int i,j,num=0;
    int temp=0;
    int head = 0,tail=0;
    char a[MAX];
    scanf("%s",a);
    while(a[i++]=='1')
    {
        head++;
    }
     
    while(a[i]!='\0')
    {
        if(a[i]=='1')
        {
            temp++;
            tail++;
        }  
        else if(a[i]=='0')
        {
            temp = 0;
            tail = 0;
        }
        if(num<temp)
        {
            num = temp;
        }
        i++;
    }
    if(head!=0)
    {
        temp = tail+head;
        if(temp>num)
            num = temp;
    }
    printf("%d",num);
    return 0;
}