WA 10
WA 14

My Source

import java.util.*;
public class JavaApplication3 {


    public static void main(String[] args) {
        String SubPalabra1="";
        String SubPalabra2="";
        String Correcta="";

        String Verdadera="";
        int menor;
        String resto="";
        Scanner D=new Scanner(System.in);
        String palabra=D.nextLine().trim();
        if(palabra.length()!=1){
            for(int i=0;i<palabra.length();i++){
                Verdadera="";
                resto=palabra.substring(i+1, palabra.length());
                if(resto.indexOf(palabra.charAt(i))!=-1){
                    SubPalabra1=""+palabra.charAt(i)+resto.substring(0,resto.length());
                      SubPalabra2=""+resto.substring(resto.indexOf(palabra.charAt(i)),resto.length());
                    if(SubPalabra1.length()<SubPalabra2.length()){
                        menor=SubPalabra1.length();
                    }
                    else{
                        menor=SubPalabra2.length();
                    }
                    for(int j=0;j<menor;j++){

                        if(SubPalabra1.charAt(j)==SubPalabra2.charAt(j)){
                            Verdadera=Verdadera+SubPalabra1.charAt(j);
                            if(Verdadera.length()>Correcta.length()){
                                Correcta=Verdadera;
                            }
                        }
                        else{
                            j=menor;
                        }
                    }
                }

            }
        }
        else{
            System.out.println(palabra);
        }
        System.out.println(Correcta);


    }
}

Who is the word that no work?

I have written solution that reached test 22 during the competition(I think it corresponds to 15th in offline mode) but now I have wa and i have run out of ideas. Can anyone give me a clue on this problem. Is there a problem with precision (I am making calculations with long double but use sqrt which is a bit unprecise).

Use queues

KTO NIBUD PONIMAET, KAK EE RESHIT

Do not use "n/3" or "n div 3" or "input div 3" or "input/3".
Do not use any division.
while input n, n:=n*3 ;
and then you won't have to divide at 3 every input;
Sorry for bad english.If any questions please ask.

#include <bits/stdc++.h>
using namespace std;

int main() {
    string letter="abcdefghijklmnopqrstuvwxyz";
    int k=letter.size();
    int i1,i2,i3;
    string part,bigpart;
    for(i1=0;i1<k;i1++)
    {
        for(i2=0;i2<k;i2++)
        {
            for (i3=0;i3<k;i3++)
            {
                part="";
                part.pb(letter[i1]);
                if(part[0]!=letter[i2]) part.pb(letter[i2]); else continue;
                if(part[0]!=letter[i3]&&part[1]!=letter[i3]) part.pb(letter[i3]); else continue;
                bigpart.pb(letter[i1]);bigpart.pb(letter[i2]);bigpart.pb(letter[i3]);
            }
        }
    }
    string ans="";
    //cout<<bigpart.size()/3;
    while(ans.size()<1000000)
    {
        ans=ans+bigpart;
    }
    /*for (int i=0;i<1000000;i++)
    {
        cout<<ans[i];
    }*/
    int res=0;
    for (int i=0;i<1000000;i++)
    {
        if (ans.substr(i,1)=="a") res++;
    }
    cout<<res;
    return 0;
}

Maybe 1 test is a sort of tricky?

Edited by author 06.04.2017 01:18

#include<stdio.h>
#include<math.h>

int main()
{
    int N;

    scanf("%d",&N);

    int i,ck = 0;
    for(i = 2; i <= abs(N); i++)
        ck += i;

    if(N < 0)
        printf("-%d\n",ck);
    else
        printf("%d\n",ck);

    return 0;
}

Hello,
Should we multiply by k or n%k if (n - i*k) equals k or n%k ?
Which sample is correct?
Sample 1
8!! = 8 *(8-2)*(8-4)*(8-6)*2

Sample 2
8!! = 8 *(8-2)*(8-4)*(8-6)

any idea what could be my mistake? i'm using
i=n; i< 2n; i++
h2=((mod + h2 - dn * a[i-n] % mod) * d % mod + a[i]) % mod;

where d=256, dn=d^(n-1) mod=10^9+9

2
10
15
16

->
Unrecoverable error. (not "Error in record #1. Correct number is: 1.")

if a route is defined by the stops: 1, 2, 4. Can they go from 4 to 2 then to 1 or is it one-way route?

#include <iostream>
using namespace std;
int main(){
    unsigned int a, b;
    cin >> a >> b;
    cout << a+b;
    return 0;
}

#include <stdio.h>
int main(){
  int a, b;
  scanf("%d %d", &a, &b);
  printf("%d", a + b);
  return 0;
}

import java.util.Scanner;

public class Zadachi {

    public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int k = sc.nextInt();
    int x = 2;
        if(n<=k){ System.out.print(x);
        }else{

            if (n*2 % k == 0){
                System.out.print(n*2/k);
            }else{
                System.out.print(n*2/k+1);
            }
        }

}
}

#include <iostream>
#include <math.h>
using namespace std;
int main()
{
    char N[51];
    cin >> N;
    int i;
    for (i = 0; N[i] != '\0'; i++);
    char Y[4];
    int counter = 0, a = 0;
    if (i % 3 == 0)
    {
        for (int j = 0; j < i; j += 3)
        {
            Y[0] = N[j];
            Y[1] = N[j + 1];
            Y[2] = N[j + 2];
            Y[3] = 0;
            if (counter % 2 == 0)
            {
                int temp = atoi(Y);
                a += temp;
            }
            if (counter % 2 == 1)
            {
                int temp = atoi(Y);
                a -= temp;
            }
            counter++;
        }
    }
    if (i % 3 != 0)
    {
        int start = i % 3;
        for (int maloe = 0; maloe < start; maloe++)
        {
            Y[maloe] = N[maloe];
        }
        Y[start] = '\0';
        int temporary = atoi(Y);
        a -= temporary;
        int counter = 0;
        for (int j = start; j < i; j += 3)
        {
            Y[0] = N[j];
            Y[1] = N[j + 1];
            Y[2] = N[j + 2];
            Y[3] = 0;
            if (counter % 2 == 0)
            {
                int temp = atoi(Y);
                a += temp;
            }
            if (counter % 2 == 1)
            {
                int temp = atoi(Y);
                a -= temp;
            }
            counter++;
        }
    }

    cout << abs(a%7);
    system("pause");
    return 0;
}

1
1 366
-565864 609690 15155
516588 775970 765044
814205 -251004 532061

magion will stop in the middle of second args...please check it

#include <iostream>
using namespace std;
int main(){
  int n, i = 0;
  cin >> n;
  while (n != 1){
    if (n <= 1){
        i+= n;
        n++;
    }
    else if (n >= 1){
        i+= n;
        n--;
    }
  }
    cout << i+1;
    return 0;
}

#include <stdio.h>
int main() {
  int n, i = 0;
  scanf("%d", &n);
  while (n != 1){
    if (n <= 1){
        i+= n;
        n++;
    }
    else if (n >= 1){
        i+= n;
        n--;
    }
  }
  printf("%d", i+1);
  return 0;
}