Втората

#include <stdio.h>



#define countof(a) (sizeof(a)/sizeof(*a))



void main() {

    int a[] = { 4,3,5,2,1 };

    int low[countof(a)], high[countof(a)];

    int i, j, lprod, hprod;



    for(lprod = hprod = 1, i = 0, j = countof(a) - 1; i < countof(a); i++, j--) {

        low[i ] = lprod;

        high[j] = hprod;

        lprod *= a[i ];

        hprod *= a[j];

    }

    for(i = 0; i < countof(a); i++)

        printf("%d,", low[i ]*high[i ]);

}

#include <stdio.h>



#define countof(a) (sizeof(a)/sizeof(*a))



void main() {

    int a[] = { 10,1,4,2,1,8,3,5,6 };

    int low[countof(a)], high[countof(a)];

    int i, j, lidx, hidx;



    for(lidx = 0, i = lidx+1, hidx = countof(a) - 1, j = hidx-1; i < countof(a) - 1; i++, j--) {

        low[i ] = lidx;

        high[j] = hidx;

        if(a[i ] < a[lidx]) lidx = i;

        if(a[j] > a[hidx]) hidx = j;

    }

    for(i = 1; i < countof(a) - 1; i++) {

        if(a[low[i ]] < a[i ] && a[i ] < a[high[i ]])

            printf("a[%d]=%d < a[%d]=%d < a[%d]=%d\n", low[i ], a[low[i ]], i, a[i ], high[i ], a[high[i ]]);

    }

}

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