燈光師小明

10 8CHANGE 1QUERYCHANGE 2QUERYCHANGE 1CHANGE 9CHANGE 7QUERY樣例輸出
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#include<stdio.h>#include<string.h>int main(){	int number,time;	while(scanf("%d%d",&number,&time)!=EOF)	{		int count=0;		char str[20];		int arr[number+1];		memset(arr,0,sizeof(arr));		getchar();		while(time--)		{			gets(str);			if(str[0]=='Q')			{				PRintf("%d/n",count);			}			else			{				char *p=str;				while(*p!=' ')				{					p++;				}				int num=0;				p++;				while(*p)				{					num=num*10+*p-'0';					p++;				}			//	printf("num:%d arr[%d]:%d/n",num,num,arr[num]);				if(arr[num]==0)				{					arr[num]=1;					count++;				}				else if(arr[num]==1)				{					arr[num]=0;					count--;				}			}		}	}	return 0;}