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added 19 characters in body

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edited Oct 2, 2017 at 0:56

C (gcc), 7474 73 bytes

f(int*l){int s[10]={},r=1;for(;~*l;s[*l++]++)r*=!*l||s[*l-1]--;return!! r;}

Requires the input array to mark the end with -1. Example usage:

int main(int argc, char** argv) {
    int a[] = {0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 4, 5, 6, 7, 8, 9, 0, -1};
    printf("%d\n",  f(a));
    return 0;
}

f(int*l){int s[10]={},r=1;for(;~*l;s[*l++]++)r*=!*l||s[*l-1]--;return!!r;}

Requires the input array to mark the end with -1. Example usage:

int main(int argc, char** argv) {
    int a[] = {0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 4, 5, 6, 7, 8, 9, 0, -1};
    printf("%d\n",  f(a));
    return 0;
}

f(int*l){int s[10]={},r=1;for(;~*l;s[*l++]++)r*=!*l||s[*l-1]--;return r;}

Requires the input array to mark the end with -1. Example usage:

int main(int argc, char** argv) {
    int a[] = {0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 4, 5, 6, 7, 8, 9, 0, -1};
    printf("%d\n",  f(a));
    return 0;
}

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created Oct 1, 2017 at 23:20

f(int*l){int s[10]={},r=1;for(;~*l;s[*l++]++)r*=!*l||s[*l-1]--;return!!r;}

Requires the input array to mark the end with -1. Example usage:

int main(int argc, char** argv) {
    int a[] = {0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 4, 5, 6, 7, 8, 9, 0, -1};
    printf("%d\n",  f(a));
    return 0;
}