longest_seq.c

#include <stdio.h>

int main(void) {
    int arr[] = { 10,100,5,-4,-89,29,-2,-8,-49,-499,0,94 };
    int n = sizeof(arr) / sizeof(arr[0]);

    int seq_start = -1;
    int longest_seq = 0;

    for ( int i=0; i<n; ++i ) {
        if ( arr[i] < 0 ) {
            if ( seq_start < 0 ) {
                seq_start = i;
            }
        } else if ( seq_start > -1 ) {
            printf("seq found (%d,%d) (len=%d)\n", seq_start, i-1, i-seq_start);

            if ( i-seq_start > longest_seq ) {
                longest_seq = i-seq_start;
            }

            seq_start = -1;
        }
    }

    printf("longest: %d\n", longest_seq);

    return 0;
}