Revise paste Untitled

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

int main() {
    int n, m;
    scanf("%d%d", &n, &m);
    int mat[n][m];
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            scanf("%d", &mat[i][j]);
        }
    }
    int nova_matrica[(n + 2) / 2][(m + 2) / 2];
    int ni = 0;
    int nj = 0;
    for(int i = 0; i < n; i += 2) {
        nj = 0;
        for(int j = 0; j < m; j += 2) {
            int maks_sosed = mat[i][j];
            if(j + 1 < m) { // deka postoi sosedot koj e na desno od momentalnata kelija
                if(maks_sosed < mat[i][j + 1]) {
                    maks_sosed = mat[i][j + 1];
                }
            }
            if(i + 1 < n) {
                if(maks_sosed < mat[i + 1][j]) {
                    maks_sosed = mat[i + 1][j];
                }
            }
            if(i + 1 < n && j + 1 < m) {
                if(maks_sosed < mat[i + 1][j + 1]) {
                    maks_sosed = mat[i + 1][j + 1];
                }
            }
            nova_matrica[ni][nj] = maks_sosed;
            nj++;
        }
        ni++;
    }
    for(int i = 0; i < ni; i++) {
        for(int j = 0; j < nj; j++) {
            printf("%d ", nova_matrica[i][j]);
        }
        printf("\n");
    }
}
/*
 5 5
 1 7 5 0 4
 2 3 18 -3 5
 14 0 7 5 2
 3 3 4 5 6
 7 0 0 1 2
 
 *.*/