черепашка

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
  int n, m;
  cin >> n >> m;

  int **toxic = new int*[n];
  int **result = new int*[n];

  for (int i = 0; i < n; i++)
   {
     toxic[i] = new int[m];
     result[i] = new int[m];
   }

  for (int i = 0; i<n; i++)
   for ( int j = 0; j < m; j++)
    cin >> toxic[i][j];

  result[0][0] = toxic[0][0];

  for (int i = 1; i<n; i++)
  result[i][0] = result[i-1][0] + toxic[i][0];

  for (int j = 1; j<m; j++)
  result[0][j] = result[0][j-1] + toxic[0][j];

  for (int i = 1; i<n; i++)
   for ( int j = 1; j < m; j++)
    {
      result[i][j] = min(result[i-1][j], result[i][j-1]) + toxic[i][j];
    }

  cout << result[n-1][m-1];

}