Submission #856963

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;


#define li			long long int
#define rep(i,to)	for(li i=0;i<((li)(to));i++)
#define repp(i,start,to)	for(li i=(li)(start);i<((li)(to));i++)
#define pb			push_back
#define sz(v)		((li)(v).size())
#define bgn(v)		((v).begin())
#define eend(v)		((v).end())
#define allof(v)	(v).begin(), (v).end()
#define dodp(v,n)		memset(v,(li)n,sizeof(v))
#define bit(n)		(1ll<<(li)(n))
#define mp(a,b)		make_pair(a,b)
#define rin	rep(i,n)
#define EPS 1e-12
#define ETOL 1e-8
#define MOD 1000000007
typedef pair<li, li> PI;

#define INF bit(60)

#define DBGP 1


#define idp if(DBGP)
#define F first
#define S second
#define p2(a,b)		idp cout<<a<<"\t"<<b<<endl
#define p3(a,b,c)		idp cout<<a<<"\t"<<b<<"\t"<<c<<endl
#define p4(a,b,c,d)		idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<endl
#define p5(a,b,c,d,e)		idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<endl
#define p6(a,b,c,d,e,f)		idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<endl
#define p7(a,b,c,d,e,f,g)		idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<endl
#define p8(a,b,c,d,e,f,g,h)		idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<"\t"<<h<<endl
#define p9(a,b,c,d,e,f,g,h,i)		idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<"\t"<<h<<"\t"<<i<<endl
#define p10(a,b,c,d,e,f,g,h,i,j)		idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<"\t"<<h<<"\t"<<i<<"\t"<<j<<endl
#define foreach(it,v)	for(__typeof((v).begin()) it=(v).begin(); it!=(v).end(); ++it)
#define p2p(x)		idp p2((x).F, (x).S)
#define dump(x,n)	idp{rep(i,n){cout<<x[i]<<" ";}puts("");}
#define dump2(x,n)	idp{rep(i,n){cout<<"["<<x[i].F<<" , "<<x[i].S<<"] ";}puts("");}
#define dumpi(x)	idp{foreach(it, x){cout<<(*it)<<" ";}puts("");}
#define dumpi2(x)	idp{foreach(it, x){cout<<"["<<(it)->F<<" , "<<(it)->S<<"] ";}puts("");}

#define read2d(a,w,h)	rep(i,h)rep(j,w)cin>>a[i][j]
#define dump2d(a,w,h)	rep(i,h){rep(j,w)cout<<a[i][j]<<" ";puts("");}

typedef pair<li, li> PI;

li n;
li x[100100];
li l;

li next_[22][100100];
li step[20];

inline li calc_next_(li pos) {
	li* new_pos = upper_bound(x, x + n, x[pos] + l);
	return (li)(new_pos - 1 - x);
}

inline li solve(li a, li b) {
	if (a > b)swap(a, b);
	li pos = a;
	li res = 0;
	while (pos != b) {
		//p3(a, b, pos);
		res++;
		if (x[b] - x[pos] <= l) {
			pos = b;
			continue;
		}
		pos = calc_next_(pos);
	}
	return res;
}

inline li solve2(li a, li b) {
	if (a > b)swap(a, b);
	li step_width = 20;
	li res = 0;
	while (step_width >= 0) {
		if (next_[step_width][a] > b) {
			// stepが大きすぎた
		} else if (next_[step_width][a] == b) {
			// ちょうど着けた
			res += step[step_width];
			return res;
		} else {
			// stepではまだつけない
			a = next_[step_width][a];
			res += step[step_width];
		}
		step_width--;
	}
	return res;
}

int main() {
	cin >> n;
	rin{cin >> x[i];}
	li q;
	cin >> l >> q;
	rep(i, n) {
		next_[0][i] = calc_next_(i);
	}
	next_[0][n - 1] = n;
	step[0] = 1;
	repp(i, 1, 21) {
		rep(j, n) {
			li mid = next_[i - 1][j];
			if (mid >= n - 1) {
				next_[i][j] = n;
			} else {
				next_[i][j] = next_[i - 1][mid];
			}
		}
		step[i] = step[i - 1] * 2;
	}
	//dump2d(next_, n, 21);

	rep(i, q) {
		li a, b;
		cin >> a >> b;
		a--;
		b--;
		cout << solve2(a, b) << endl;
	}


	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:119:28: warning: iteration 19u invokes undefined behavior [-Waggressive-loop-optimizations]
   step[i] = step[i - 1] * 2;
                            ^
./Main.cpp:7:48: note: containing loop
 #define repp(i,start,to) for(li i=(li)(start);i<((li)(to));i++)
                                                ^
./Main.cpp:110:2: note: in expansion of macro ‘repp’
  repp(i, 1, 21) {
  ^

Judge Result