#include <stdlib.h>
#include <stdio.h>

typedef struct node {

    int col;
    float val;
    struct node* next;
}node_t;



typedef struct {

    int NR;
    int NC;

    node_t** rows;

}matr_t;


void MATRwrite(matr_t* M, int r, int c, float val) {

    node_t* newNode;

    // out newNode ./int col = ??, float val=??; ......next;

    newNode = malloc(sizeof(node_t));
    // out newNode ./int col = 1232323121, float val=224232.00000; ......next;

    newNode->col = c;
    newNode->val = val;

    newNode->next = M->rows[r];

    M->rows[r] = newNode;
}