can anyone please explain the solution which uses the coordinates i think ...

Edited by author 24.01.2023 20:46

Edited by author 24.01.2023 20:46

Edited by author 24.01.2023 20:46

#include<bits/stdc++.h>
using namespace std;
int main(){
    int t;
    cin >> t;
    while(t--){
        string s;
        cin >> s;
        int a = int(s[1] - 48);
        if(s[0]=='a' ||s[0]=='h'){
            if(a==1 ||a==8)
                cout << 2 << endl;
            else if(a==2||a==7)
                cout << 3 << endl;
            else if(a>2)
                cout << 4 << endl;
        }
        else if(s[0]=='b'||s[0]=='g'){
            if (a == 1 || a==8)
                cout << 3 << endl;
            else if (a == 2|| a==7)
                cout << 4 << endl;
            else if (a > 2)
                cout << 6 << endl;
        }
        else{
            if (a == 1|| a==8)
                cout << 4 << endl;
            else if (a == 2|| a==7)
                cout << 6<< endl;
            else if (a > 2)
                cout << 8<< endl;
        }
    }
}

#include <iostream>
#include <vector>
#include <iterator>

int main() {
    int N;
    std::cin >> N;
    char v;
    int h, c = 0;
    std::vector<int> result;
    while (N--) {
        std::cin >> v >> h;
        v = v - 'a' + 1;
        if (h > 1 && v > 2) c += 1;
        if (h > 1 && v < 7) c += 1;
        if (h > 2 && v > 1) c += 1;
        if (h > 2 && v < 8) c += 1;

        if (h < 8 && v > 2) c += 1;
        if (h < 8 && v < 7) c += 1;
        if (h < 7 && v > 1) c += 1;
        if (h < 7 && v < 8) c += 1;

        result.push_back(c);
        c = 0;
    }
    std::copy(result.begin(), result.end(), std::ostream_iterator<int>(std::cout, "\n"));

    return 0;
}

. - empty cage
1 - chess knight
2 - cells under attack

8 | . . . . . . . .
7 | . . . . . . . .
6 | . . 2 . 2 . . .
5 | . 2 . . . 2 . .
4 | . . . 1 . . . .
3 | . 2 . . . 2 . .
2 | . . 2 . 2 . . .
1 | . . . . . . . .
___________________
    a b c d e f g h
    1 2 3 4 5 6 7 8

WA on test 2 don't know why  :(

Edited by author 01.07.2016 14:09

Edited by author 01.07.2016 14:09

Edited by author 01.07.2016 14:09

Edited by author 01.07.2016 14:10

#include <iostream>
using namespace std;
int main()
{
    int count;
    cin >> count;
    while (count--)
    {
        char x, y;
        cin >> x >> y;
        float a = (x - 'a') - 3.5;
        float b = (y - '1') - 3.5;
        cout << trunc(1.143 * trunc(1.2 * (6 - trunc((a * a + b * b) * 0.2f)))) << endl;
    }
}

hi how is this issue in java programming language. please help

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    while(n--){
        string s;
        int a,b;
        cin>>s;
        a = s[0]-'a'+1;
        b = s[1]-'0';
        a = min(a,9-a);
        b = min(b,9-b);
        if(a==b){
            if(a==1) printf("2\n");
            else if(a==2) printf("4\n");
            else printf("8\n");
        } else {
            if((a==1&&b==2)||(a==2&&b==1)) printf("3\n");
            else if((a==1&&b>=3)||(a>=3&&b==1)) printf("4\n");
            else if((a==2&&b>=3)||(a>=3&&b==2)) printf("6\n");
            else if(a>2&&b>2)printf("8\n");
        }
    }
    return 0;
}

What is wrong with my code? :(

#include <stdio.h>
#include <stdlib.h>

int main (){

 int N;
 scanf ("%d",&N);

    for (int i = 0 ; i < N ; i++){
       char x;
       int y;
       getchar();
       scanf ("%c %d",&x,&y);
       int movimientos = 0;

       if (y + 2 <= 8)
        if (x - 1 >= 97){
         movimientos++;
        }

       if (y+2 <=8)
        if (x + 1<=104){
         movimientos++;
        }

       if (y-2 >= 1)
        if (x-1 >97){
         movimientos++;
        }

       if (y-2 >= 1)
        if (x + 1 <= 104){
         movimientos++;
        }

       if (x+2 <= 104)
        if (y - 1 >= 1){
         movimientos++;
        }

       if (x+2 <= 104)
        if (y+1 <= 8){
         movimientos++;
        }

       if (x-2 >= 97)
        if (y+1 <= 8){
         movimientos++;
        }

       if (x-2 >= 97)
        if (y-1 >= 1){
         movimientos++;
        }
       printf ("\n %d", movimientos);
       printf ("\n");
    }

 return 0;
}

Edited by author 21.10.2020 01:36

Edited by author 21.10.2020 01:37

#include<bits/stdc++.h>
using namespace std;
//input section
#define si1(x)       scanf("%d",&x)               //one integer
#define si2(x,y)     scanf("%d%d",&x,&y)          //two integers
#define si3(x,y,z)   scanf("%d%d%d",&x,&y,&z)     //three integers
#define sl(x)        scanf("%lld",&x)             //long long int
#define sul(x)       scanf("%llu",&x)             //unsigned long long
#define ss(x)        scanf("%s",s)                //string
#define sd(x)        scanf("%lf",&x)              //double

//output section
#define   pf          printf
#define   pfi(x)      printf("%d\n",x)
#define   pfl(x)      printf("%lld\n",x)
#define   pfd(x)      printf("%lf\n",x)
#define   nl          printf("\n")

//data type
#define   ll          long long int
#define   ld          long double
#define   ull         unsigned long long

//general
#define    pb          push_back
#define    mp          make_pair
#define    f           first
#define    s           second
#define    all(x)      x.begin( ),x.end( )
#define    sv(x)       memset(x, 0, sizeof(x))
#define    PI          3.1415926535897932384626
#define    mod         1000000007

//loop
#define    lp(a,b)      for(int i=a;i<b;i++)            //assending order
#define    lpr(a,b)     for(int i=b;i>=a;i--)           //decending order
#define    pl(a)        pair<ll, ll>a
#define    ppi(a)       pair<int,int>a
#define    vec(v)       vector<int>v
#define    vi(v,itr)    vector<int>::iterator itr=v.begin( );

void solve( )
{
    int cnt=0;
    char s,h;
    cin>>s>>h;
    int p,q;
    p=(int)s-96;
    q=(int)h-48;
    if((p+1)>=1 && (p+1)<=8 && (q-2)>=1 && (q-2)<=8) ++cnt;
    if((p-1)>=1 && (p-1)<=8 && (q+2)>=1 && (q+2)<=8) ++cnt;
    if((p-1)>=1 && (p-1)<=8 && (q-2)>=1 && (q-2)<=8) ++cnt;
    if((p+1)>=1 && (p+1)<=8 && (q+2)>=1 && (q+2)<=8) ++cnt;
    if((p+2)>=1 && (p+2)<=8 && (q-1)>=1 && (q-1)<=8) ++cnt;
    if((p-2)>=1 && (p-2)<=8 && (q+1)>=1 && (q+1)<=8) ++cnt;
    if((p-2)>=1 && (p-2)<=8 && (q-1)>=1 && (q-1)<=8) ++cnt;
    if((p+2)>=1 && (p+2)<=8 && (q+1)>=1 && (q+1)<=8) ++cnt;
    cout<<cnt<<endl;
}

int main( )
{
    //code by noob coder BD (Shahariar,CSE,RUET-19)

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    int t=1;
    cin>>t;
    while(t--)
    {
        solve( );
    }
    return 0;
}

#include <iostream>
#include <stdio.h>
#include <vector>

using namespace std;

class Place {
public:
    char x;
    int y;

    bool isOnboard() {
        if (x < 'a' || x > 'h' || y < 1 || y > 8) return false;
        return true;
    }



    Place(char x, int y) {
        this->x = x;
        this->y = y;
    }

};



int main(int argc, const char * argv[])
{
    int N;
    cin >> N;


    vector<Place> places;

    for (int i = 0; i < N; i++) {
        char x;
        int y;
        cin.get(x);

        if (x == '\n') {
            i--;
            continue;
        }

        cin >> y;

        Place place (x, y);
        places.push_back(place);

    }


    for (int i = 0; i < N; i++) {
        Place place = places[i];
        int moves = 0;


        //left 2 up 1
        place.x -= 2;
        place.y -= 1;
        moves += place.isOnboard();

        //left 2 down 1
        place.y += 2;
        moves += place.isOnboard();

        //right 2 down 1
        place.x += 4;
        moves += place.isOnboard();
        //right 2 up 1
        place.y -= 2;
        moves += place.isOnboard();

        //right 1 up 2
        place.x -= 1;
        place.y -= 1;
        moves += place.isOnboard();

        //left 1 up 2
        place.x -= 2;
        moves += place.isOnboard();

        //left 1 down 2
        place.y += 4;
        moves += place.isOnboard();

        //right 1 down 2
        place.x += 2;
        moves += place.isOnboard();

        cout << moves << endl;

    }



}

Problem solved

Edited by author 13.09.2017 11:45

What is the test data for Test#2?

package main

import (
    "bufio"
    "os"
    "strconv"
    "fmt"
    "strings"
)

func main() {
    reader := bufio.NewReader(os.Stdin)
    firstLine, _ := reader.ReadString('\n')
    count, _ := strconv.Atoi(strings.Trim(firstLine, "\n"))
    result := make([]int, count)

    for i := 0; i < count; i++ {
        position, _ := reader.ReadString('\n')
        result[i] = countFieldsUnderAttack(position)
    }

    for _, val := range result {
        fmt.Println(val)
    }
}

func countFieldsUnderAttack(position string) int {
    result := 0

    var positionInts [2]int
    positionInts[0] = int(position[0]) - int('a') + 1
    positionInts[1] = int(position[1]) - int('1') + 1

    moves := [8][2]int{
        {1, 2},
        {2, 1},
        {-1, -2},
        {-2, -1},
        {-1, 2},
        {2, -1},
        {1, -2},
        {-2, 1},
    }

    for _, move := range moves {
        if move[0] + positionInts[0] > 0 && move[0] + positionInts[0] <= 8 {
            if move[1] + positionInts[1] > 0 && move[1] + positionInts[1] <= 8 {
                result++
            }
        }
    }

    return result
}

Edited by author 08.06.2017 23:12

#include <iostream>
#include <cstdio>
#include <cmath>

using namespace std;

const int MIN = 1, MAX = 8;

int free(int x0, int y0) {
    int c = 0; double r0 = sqrt(5), r;
    for (int x = x0 - 2; x <= x0 + 2; x++)
        for (int y = y0 - 2; y <= y0+2; y++) {
            r = sqrt(pow(x - x0, 2) + pow(y - y0, 2));
            if (r == r0 && x >= MIN && x <= MAX && y >= MIN && y <= MAX) c++;
        }

    return c;
}

int main() {
    int T; // kolichestvo testovyx blokov
    cin >> T; cin.ignore();

    int x, y;
    for (int t = 0; t < T; t++) {
        x = cin.get() - 'a' + 1;
        y = cin.get() - '0';
        cout << free(x, y) << endl;
        cin.ignore();
    }
}

Edited by author 20.11.2016 00:44

Edited by author 05.03.2017 21:25

'n' is the number of test cases and 'res' it's a function that print the number of positions that can go.

The problem is that it only reads one case, for example "a2", prints the result and ends the execution.

Why that happen?

void res(char p[2]);
int main () {
int i,n;
char pos[2];
scanf("%d", &n);
for(i=0; i<n; i++) {
    scanf("%s", &pos);
    res(pos);
}

Edited by author 05.01.2017 08:22

int a[10]={-1,1,2,2,1,-1,-2,-2,-1,1};
...
for(i=1;i<=8;i++) if(x+a[i-1]>0 && x+a[i-1]<9 && y+a[i+1]>0 && y+a[i+1]<9) h++;

DO IT!!! :)

#include <stdio.h>
#include <iostream>
using namespace std;
int main()
{
int n, m, i;
char l, dt;
cin>>n;
for(i=0;i<n;i++){

    cin>>l>>dt;
        if(l=='a' && dt=='1' ||l=='a' && dt=='8' ||l=='h' && dt=='1' ||l=='h' && dt=='8')
        {
            m=2;
            cout<<m<<endl;
        }
        if(l=='a' && dt=='2' ||l=='a' && dt=='7' ||l=='b' && dt=='1' ||l=='b' && dt=='8' ||l=='g' && dt=='1'||l=='g' && dt=='8'||l=='h' && dt=='2'||l=='h' && dt=='7')
        {
            m=3;
            cout<<m<<endl;
        }
        if(l=='a' && dt=='3' ||l=='a' && dt=='4' ||l=='a' && dt=='5' ||l=='a' && dt=='6' ||l=='b' && dt=='2'||l=='b' && dt=='7'||l=='c' && dt=='1'||l=='d' && dt=='1'||l=='e' && dt=='1'||l=='f' && dt=='1'||l=='c' && dt=='8'||l=='d' && dt=='8'||l=='e' && dt==8||l=='f' && dt=='8'||l=='g' && dt=='7'||l=='g' && dt=='2'||l=='h' && dt=='3'||l=='h' && dt=='4'||l=='h' && dt=='5'||l=='h' && dt=='6')
        {
            m=4;
            cout<<m<<endl;
        }
        if(l=='b' && dt=='3' ||l=='b' && dt=='4' ||l=='b' && dt=='5' ||l=='b' && dt=='6' ||l=='c' && dt=='2' ||l=='d' && dt=='2' ||l=='e' && dt=='2' ||l=='f' && dt=='2' ||l=='c' && dt=='7' ||l=='d' && dt=='7'||l=='e' && dt=='7'||l=='f' && dt=='7'||l=='g' && dt=='3'||l=='g' && dt=='4'||l=='g' && dt=='5'||l=='g' && dt=='6')
        {
            m=6;
            cout<<m<<endl;
        }
        if(l=='c' && dt=='3' ||l=='c' && dt=='4' ||l=='c'&& dt=='5' ||l=='c' && dt=='6' ||l=='d' && dt=='3' ||l=='d' && dt=='4' ||l=='d' && dt=='5' ||l=='d' && dt=='6' ||l=='e' && dt=='3' ||l=='e' && dt=='4' ||l=='e' && dt=='5' ||l=='e' && dt=='6' ||l=='f' && dt=='3' ||l=='f' && dt=='4' ||l=='f' && dt=='5' ||l=='f' && dt=='6')
        {
            m=8;
            cout<<m<<endl;
        }
}
    return 0;
}

I checked all values but something is wrong... That works on my IDE...
Sorry, i am noob but this solution must work fine!

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package test;

import java.util.ArrayList;
import java.util.Scanner;

/**
 *
 * @author MMT
 */
public class P1197 {


    public static void main(String[] args){
    // declaration of variables
       Scanner in_number=new Scanner (System.in);
       Scanner in_string=new Scanner (System.in);

       int n=0;
       ArrayList res=new ArrayList();
       String s=" ";
       char c1=' ';
       int c2=0;
       int contr=0;
       n=in_number.nextInt();

       if(n>0 && n<101){
       for(int i=0;i<n;i++){

            s=in_string.next();

            c1=s.charAt(0);
            c2=Integer.parseInt(s.substring(1));

    if((((char)c1+1) <'i')  &&(((char)c1+1) >'`')   && ((c2+2)<=8)      && ((c2+2)>0)  )
     contr++;
    if((((char)c1-1) >'`')  &&(((char)c1-1) <'i')   && ( (c2+2)<=8)     && ((c2+2)>0))
      contr++;
    if( (((char)c1+1)<'i')  &&(((char)c1+1) >'`')   && ( (c2-2)>0)      && ( (c2-2)<=8)) // right
       contr++;
    if((((char)c1-1) >'`')  &&(((char)c1-1) <'i')   && ( (c2-2)>0)      && ( (c2-2)<=8) ) // right
       contr++;
    if((((char)c1+2) <'i')  &&(((char)c1+2) >'`')   && ( (c2+1)<=8)     && ((c2+1)>0))// not checked
       contr++;
    if((((char)c1-2) >'`')  &&(((char)c1-2) <'i')   && ( (c2+1)<=8)     && ((c2+1)>0))   // right
       contr++;
    if((((char)c1+2) <'i')  &&(((char)c1+2) >'`')   && ( (c2-1)>0)      && ( (c2-1)<=8))    // not checked
       contr++;
    if((((char)c1-2) >'`')  &&(((char)c1-2) <'i')   && ( (c2-1)>0)      && ( (c2-1)<=8))    //  right
        contr++;

res.add(contr);
contr=0;
c1=' ';
c2=0;
s=" ";
       }
       for(int j=0;j<res.size();j++){
       System.out.println(res.get(j));

       }
       }/*
        char x = 'a';
        x=(char) (x-1);
      System.out.println(x);
    */}
}

Edited by author 01.07.2016 10:11