CF 5A. Chat Server's Outgoing Traffic

CF 5A. Chat Server's Outgoing TrafficClick   to open the link

The meaning of the question: simulate a chat system +name means someone enters the chat system, -name means go out, name: means send a message. Whenever someone sends a message, the message will be sent to everyone currently in the chat system, including himself, to find the total number of bytes.

Idea: record the total number of people in the current chat system, and then multiply it by the number of bytes of information and add them up

#include <iostream>
#include<cstring>
#include<cstdio>
using namespace std;
char ch[105];
intmain()
{

    int ans=0;
    int sum=0;
    while(gets(ch)){
        int byte=0,flag=0;
        if(ch[0]=='+')
            sum++;
        else if(ch[0]=='-')
            sum--;
        else{
            int len ​​= strlen (ch);
            for(int i=0;i<len;i++){
                if(flag)
                    byte++;
                if(ch[i]==':')
                    flag=1;
            }
        }
        ans+=byte*sum;
    }
    cout<<ans<<endl;
    return 0;
}