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#include<bits/stdc++.h>
using namespace std;
string a[1000][1000];             //-- represent the input grid
string f[1000][1000];             //-- represent the array used for memoization
bool calculated[1000][1000];      //-- false if we have not calculate the value before, and true if we have
int n,m;
 
//-- sort the string str and return it
string srt(string &str){
    sort(str.begin(), str.end());
    return str;
}
 
 
//-- return the smallest of x and y
string smallest(string & x, string &y){
    for (int i = 0; i < x.size(); i++){
        if (x[i] < y[i]) return x;
        if (x[i] > y[i]) return y;
    }
    return x;
}
 
 
string solve(int i, int j,int n,int m){
    if (i == 1 && j == 1) return a[i][j];       //-- if we have reached the buttom right cell (I assumed the array is 1-indexed
    if (calculated[i][j]) return f[i][j];       //-- if we have calculated this before 
    string ans;
    if (i == n) 
    {
    	string rtt=a[i][j] + solve(i, j + 1);
    ans = srt(rtt); 
    }//-- if we are at the buttom boundary
    else if (j == m) 
    {
    	string rtt=a[i][j] + solve(i + 1, j);
    ans = srt(rtt); 
    }
     //-- if we are at the right boundary
    else 
    {
    	string s11=solve(i, j + 1);
    	string s22=solve(i + 1, j);
    	string rtt=a[i][j] + smallest(s11,s22 );
    ans = srt(rtt); 
    }
    calculated[i][j] = true;        //-- to fetch the calculated result in future calls
    f[i][j] = ans;
    return ans;
}
 
 
 
int main()
{
int n,m;
    cin>>n>>m;
    for(int i=0;i<n;i++)
    for(int j=0;j<m;j++)
    cin>>a[i][j];
 
    cout<<solve(n,m,n,m);
    return 0;
}

prog.cpp: In function 'std::string solve(int, int, int, int)':
prog.cpp:31:41: error: too few arguments to function 'std::string solve(int, int, int, int)'
      string rtt=a[i][j] + solve(i, j + 1);
                                         ^
prog.cpp:25:8: note: declared here
 string solve(int i, int j,int n,int m){
        ^
prog.cpp:36:41: error: too few arguments to function 'std::string solve(int, int, int, int)'
      string rtt=a[i][j] + solve(i + 1, j);
                                         ^
prog.cpp:25:8: note: declared here
 string solve(int i, int j,int n,int m){
        ^
prog.cpp:42:31: error: too few arguments to function 'std::string solve(int, int, int, int)'
      string s11=solve(i, j + 1);
                               ^
prog.cpp:25:8: note: declared here
 string solve(int i, int j,int n,int m){
        ^
prog.cpp:43:31: error: too few arguments to function 'std::string solve(int, int, int, int)'
      string s22=solve(i + 1, j);
                               ^
prog.cpp:25:8: note: declared here
 string solve(int i, int j,int n,int m){
        ^

Standard output is empty