Submission #2708436

---

Source Code Expand

#include <bits/stdc++.h>
#define pb push_back
#define cmin(a,b) (a>b?a=b:a)
#define cmax(a,b) (a<b?a=b:a)
#define mem(a,k) memset(a,k,sizeof(a))
#define lop(i,s,t) for(int i=s;i<(t);++i)
#define rep(i,s,t) for(int i=s;i<=(t);++i)
#define dec(i,s,t) for(int i=s;i>=(t);--i)
#define fore(i,v) for(int i=g[v],d=es[i].d;i;i=es[i].nxt,d=es[i].d)
using namespace std;

#define Pr(f,...) //fprintf(stderr,f,##__VA_ARGS__),fflush(stderr)

typedef long long ll;

template<typename T>
void read(T &x){
	x=0; 
	char c;
	for(c=getchar();!isdigit(c);c=getchar()); 
	for(;isdigit(c);c=getchar())x=x*10+c-'0'; 
}

const int N=1e5+50;

int n,p,a[N],L;

int main(int argc,char *argv[]){
#ifdef CURIOUSCAT
	//freopen("dat.in","r",stdin);
	//freopen("my.out","w",stdout);
#endif
	read(n),read(L); 
	rep(i,1,n)read(a[i]);	
	rep(i,1,n-1)if(a[i]+a[i+1]>=L)p=i;
	if(!p){
		printf("Impossible\n");
		return 0; 
	}
	printf("Possible\n");
	
	rep(i,1,p-1)printf("%d\n",i);
	dec(i,n-1,p)printf("%d\n",i);
	return 0;
}

Submission Info

Judge Result