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any one plz help!!!

I am getting "time limit exceeded". Plz help how can i reduce the runtime??? :(


#include<iostream>
#include<cstring>
#include<cstdlib>
using namespace std;

void decode(char msg[])
{
int len=strlen(msg),n;
char m;

for (int i=len-1;i>=0;i--)
{
n=0;
if (msg =='1')
{
n=(msg -'0')*100 + (msg ...