Problema pcr sah

#include <iostream>
#include <fstream>

using namespace std;

ifstream f("date.in");

int n, a[101][101], s[101][101], maxp = 0, poz;

void drum(int i, int j)
{
    if(i > 0){
        if(s[i][j] - s[i-1][j-1] == a[i][j]) drum(i-1,j-1);
        else if(s[i][j] - s[i-1][j] == a[i][j]) drum(i-1,j);
        else drum(i-1,j+1);
        cout << i << j << "\n";
    }
}

int main()
{
    f >> n;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++)
            f >> a[i][j];

    for(int i = 1; i <= n; i++)
        s[1][i] = a[1][i];

    for(int i = 2; i <= n; i++)
        for(int j = 1; j <= n; j++)
            if(a[i][j] == 0) s[i][j] = a[i-1][j];
            else if(s[i-1][j-1] >= s[i-1][j+1]) s[i][j] = a[i][j] + s[i-1][j-1];
            else s[i][j] = a[i][j] + s[i-1][j+1];

    for(int i = 1; i <= n; i++)
        if(s[n][i] > maxp){
            maxp = s[n][i];
            poz = i;
        }
    drum(n,poz);

    return 0;
}
/*
5
0 0 0 0 0
0 1 0 1 0
0 1 1 1 1
0 0 0 1 1
0 1 0 1 1
*/