included suggestion from @ceilingcat

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edited Mar 1, 2020 at 18:05

C++ (gcc), 75 75 71 6767 65 bytes

int f(int*a,int s){int r=1;for(;--s>0;s;)r*=a[s]>=2*a[s-1];return r;}

C++ (gcc), 75 71 67 bytes

int f(int*a,int s){int r=1;for(;--s>0;)r*=a[s]>=2*a[s-1];return r;}

int f(int*a,int s){int r=1;for(;--s;)r*=a[s]>=2*a[s-1];return r;}

Applied suggestions, improved score

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edited Feb 23, 2020 at 15:22

int f(int*a,int s){for(int i=1;i<s;++i)ifr=1;for(a[i]<2*a[i;-1]-s>0;)return 0;returnr*=a[s]>=2*a[s-1];return 1;r;}

int f(int*a,int s){for(int i=1;i<s;++i)if(a[i]<2*a[i-1])return 0;return 1;}

int f(int*a,int s){int r=1;for(;--s>0;)r*=a[s]>=2*a[s-1];return r;}

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created Feb 15, 2020 at 10:25

int f(int*a,int s){for(int i=1;i<s;++i)if(a[i]<2*a[i-1])return 0;return 1;}