int search(int d[N][N], int key)
{
    int i1, i2, j1, j2;
 
    i1 = j1 = 0;
    i2 = j2 = N-1;
 
    while(i1 < i2 && j1 < j2){
        if(d[i1][j2] == key)    return 1;
        if(d[i1][j2] < key) ++i1;
        else --j2;
    }
 
    return 0;
}

  

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