OJ Board

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scanf("%c%c%c",&a[k],&ch,&b[k]); should be replaced with
scanf(" %c %c %c",&a[k],&ch,&b[k]);

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#include <iostream>
#include <time.h>
#include <sstream>
#include <algorithm>
using namespace std;

int main() {	
	int cases = 0, digits = 0;
	ostringstream s;
	int v[1000010];
	
	//clock_t start, end;
	//start = clock();
	
	cin >> cases;
	
	while ( cases --> 0 ) {
		cin >> digits;

		int a, b;
		for ( int i = 0; i < digits; i++ ) {
			cin >> a >> b;
			v[i] = a + b;
		}
		
		ostringstream s2;
		for ( int i = digits - 1; i >= 0; i-- ) {
			if ( v[i] >= 10 ) {
				v[i - 1]++;
				v[i] -= 10;
			}
			
			s2 << v[i];
		}
		
		string s2_rev = s2.str();
		reverse(s2_rev.begin(), s2_rev.end());
		s << s2_rev << endl;
	
		if ( cases >= 1 ) s << endl;
	}
	cout << s.str();
	
	//end = clock();
	//printf ("%f seconds\n", ((float)end - (float)start) / 1000000.0F);

	return 0;
}

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Removed After AC

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Removed After AC

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printf("\n\n");

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                #include<stdio.h>
                #include<memory.h>   
 
                     int sum[1000002];


                          int main()

 
					   {


						         int i,ndigit,a,b,ncount;
						   
                            int c,count=1;
                               
                          scanf("%d",&ncount);
						 


						  while(count<=ncount)
						  {
                         
                          memset(sum,0,sizeof(sum));

                          scanf("\n\n%d",&ndigit);


						  for(i=0;i<ndigit;i++)

						  {

                            scanf("\n%d %d",&a,&b);

						     c=0;

                            sum[i]=a+b;
		

						  }


                          
						  for(i=ndigit-1;i>0;i--)

						  {
                              
							  sum[i]=sum[i]+c;
							  if(sum[i]>=10){

                                 c=1;
							     sum[i]=sum[i]%10;
							  }

                              else
								  c=0;
                          } 

						    sum[i]=sum[i]+c;
			
						   
						   for(i=0;i<ndigit;i++)

						   { 
							  printf("%d",sum[i]);
							  
						   }

						   
						   if(count<ncount)
						    printf("\n\n");

						 

						   count++;

                       
						   
                       }
                          
						  return 0;
                      } 

   

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                     if(count<ncount)
                      printf("\n\n");

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                     if(count<ncount)
                      printf("\n\n");
                     else printf("\n");

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gets(aux);

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vector<int> resp;

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if(resp[resp.size()-1]>=10)
{

resp[resp.size()-1]=resp[resp.size()-1]%10;
resp.push_back(1);
}

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#include <iostream>
#include <cstdlib>//10013
using namespace std;
unsigned long nums[2][1000001],n,m,carry=0;
int main()
{
	cin>>n;for(int i=0;i<n;++i){cin>>m;memset(nums,0,sizeof(int)*2*1000001);
	for(int j=m-1;j>=0;--j)cin>>nums[0][j]>>nums[1][j];carry=0;
	for(int j=0;j<m;++j){nums[0][j]+=nums[1][j]+carry;carry = nums[0][j]/10;nums[0][j]%=10;if(carry && j==m-1)++m;}
	if(i)cout<<endl;for(int j=m-1;j>=0;--j)cout<<nums[0][j];cout<<endl;}
	return 0;
}