2dCombination.c

#include <stdio.h>

int comb(int n, int k){
    int row = n-k+1;
    int col = 1+k;
    int pascal[row][col];
    for(int i=0;i<row;i++){
        for(int j=0;j<col;j++){
            pascal[i][j] = 1;
        }
    }
    for(int i=1;i<row;i++){
        for(int j=1;j<col;j++){
            pascal[i][j] = pascal[i-1][j]+pascal[i][j-1];
        }
    }
    printf("comb(%d,%d) = %d\n", n, k, pascal[row-1][col-1]);
    return pascal[row-1][col-1];
}

int main(int argc, char const *argv[]){
    comb(30,20);
    return 0;
}