解120%AC

int run_num(int x,int y){
    int time=0;
    for(int i=x;i<=y;i++){
        time+=(i%4= =0&&i%100!=0||i%400= =0)?1:0;
    }
    return time;
}
void run_show(int x,int y){
    for(int i=x;i<=y;i++){
        if(i%4= =0&&i%100!=0||i%400= =0)printf("%d ",i);
    }
}
int main(){
    int x,y;
    scanf("%d %d",&x,&y);
    printf("%d\n",run_num(x,y));
    run_show(x,y);
}