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  1. #include <bits/stdc++.h>
  2. typedef long long ll;
  3. using namespace std;
  4. #define E '\n'
  5. #define fi "QUANCO.inp"
  6. #define fo "QUANCO.out"
  7. ll dx[5] = {-2,-2,-1,1};
  8. ll dy[5] = {1,-1,-2,-2};
  9. const int N=1e3;
  10. int n , m, fx , fy;
  11. ll dp[N+13][N+13];
  12. bool isValid(ll x,ll y){
  13.     return min(x,y) >= 1 && x <= n  && y<=m;
  14. }
  15. ll  cal(ll tx,ll ty){
  16.     while (isValid(tx,ty)){
  17.         dp[tx][ty]=0;
  18.         for (int k=0 ; k < 4 ;++k ){
  19.             ll x = tx+dx[k],y=ty+dy[k];
  20.             if (isValid(x,y)) dp[tx][ty]+=dp[x][y];
  21.         }
  22.         ++tx,--ty;
  23.     }
  24. }
  25. int main()
  26. {
  27.     ios::sync_with_stdio(0); cin . tie(0); cout . tie(0);
  28.     freopen(fi,"r",stdin); freopen(fo,"w",stdout);
  29.  
  30.     cin >> n >> m  >> fx >> fy;
  31.     dp[1][1] = 1;
  32.     for (int i=2; i <= m ; ++i) cal(1,i);
  33.     for ( int i=2; i <= n ; ++i) cal(i,m);
  34.     for (int i=1 ; i<= n ; ++i){
  35.         for (int j=1 ; j <= m ; ++j)
  36.             cout << dp[i][j] <<" ";
  37.         cout << E;
  38.     }
  39.  
  40.     cout << dp[fx][fy];
  41.  
  42.  
  43. }
  44.  
Success #stdin #stdout 0s 4536KB
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Standard input is empty
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Standard output is empty
https://ideone.com/NS1Txr
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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