This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#pragma GCC optimize("Ofast,unroll-loops")
//#pragma GCC optimize("conserve-stack")
#include<bits/stdc++.h>
//#define int long long
#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define NHP ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
#define modwwe int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".ans","w",stdout)
#define pb push_back
#define mask(k) (1<<k)
#define mp make_pair
#define checktime cerr << (double)clock() / CLOCKS_PER_SEC * 1000 << " ms";
using namespace std;
#define getchar_unlocked getchar
inline int scan()
{
char c = getchar_unlocked();
int x = 0;
while (c < '0' || c > '9')
{
c = getchar_unlocked();
}
while (c >= '0' && c <= '9')
{
x = (x << 1) + (x << 3) + c - '0';
c = getchar_unlocked();
}
return x;
}
void phongbeo();
const int inf = 1e14;
const ll mod2 = 1e9 + 7;
const int mod1 = 998244353;
const ll base=67;
int add(int x,int y)
{
if(x+y>=mod2) x-=mod2;
if(x+y<0)x+=mod2;
return x+y;
}
struct icd
{
long double a;
int b;
};
struct ib
{
int a;
int b;
};
struct ic
{
int a, b, c;
};
struct id
{
int a, b, c, d;
};
struct ie
{
int a, b, c, d, e;
};
ll n, m, s1, s2, s4, s3, sf, k, s5, s6, mx, s7, s8, s9, mx2, res, dem2 = 0, dem = 0, s33, dem3, dem4, mid, l2, r2, center;
int i, s10, s12,k1,k2,k3,s11,t,lim,w,l,r,p ;
int kk;
int el = 19;
main()
{
if(fopen(task".inp","r"))
{
fin(task);
fou(task);
}
NHP
/// cin>>s1;
// modwwe
phongbeo();
// checktime
}
ib minn[18][200001];
int st[17][100001];
ib a[100001];
vector<int> v;
ib mer(ib a,ib b)
{
if(a.a<=b.a) return a;
return b;
}
int getmin(int l,int r)
{
int k=31-__builtin_clz(r-l+1);
return mer(minn[k][l],minn[k][r-mask(k)+1]).b;
}
void phongbeo()
{
n=scan();
k=scan();
for(int i=1; i<=n; i++)
a[i].a=scan(),a[i].b=scan(),v.pb(a[i].b),v.pb(a[i].a);
sort(v.begin(),v.end());
v.erase(unique(v.begin(),v.end()),v.end());
m=v.size();
for(int i=1; i<=n; i++)
{
a[i].a=lower_bound(v.begin(),v.end(),a[i].a)-v.begin()+1;
a[i].b=lower_bound(v.begin(),v.end(),a[i].b)-v.begin()+1;
}
for(int i=1; i<=m; i++)
minn[0][i]= {m+1,i};
for(int i=1; i<=n; i++)
{
if(a[i].a<=minn[0][a[i].b].a)
minn[0][a[i].b]= {a[i].a,i};
}
for(int i=1; i<18; i++)
for(int j=1; j+mask(i)-1<=m; j++)
minn[i][j]=mer(minn[i-1][j],minn[i-1][j+mask(i-1)]);
for(int i=1; i<=n; i++)
{
st[0][i]=getmin(a[i].a,a[i].b);
}
for(int i=1; i<17; i++)
for(int j=1; j<=n; j++)
st[i][j]=st[i-1][st[i-1][j]];
while(k--)
{
down
l=scan();
r=scan();
if(a[l].b>a[r].b)
{
cout<<"impossible";
continue;
}
else if(l==r)
{
cout<<0;
continue;
}
else if(a[l].b>=a[r].a&&a[r].b>=a[l].b)
{
cout<<1;
continue;
}
else
{
s4=0;
for(int i=16; i>=0; --i)
if(a[st[i][r]].a>a[l].b)
{
s4=s4+(1<<i);
r=st[i][r];
}
if(s4==131071)
{
cout<<"impossible";
continue;
}
cout<<s4+2;
}
}
}
Compilation message (stderr)
events.cpp:38:17: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+14' to '2147483647' [-Woverflow]
38 | const int inf = 1e14;
| ^~~~
events.cpp:75:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
75 | main()
| ^~~~
events.cpp: In function 'void phongbeo()':
events.cpp:117:23: warning: narrowing conversion of '(m + 1)' from 'long long int' to 'int' [-Wnarrowing]
117 | minn[0][i]= {m+1,i};
| ~^~
events.cpp:125:59: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
125 | minn[i][j]=mer(minn[i-1][j],minn[i-1][j+mask(i-1)]);
| ~^~
events.cpp:16:21: note: in definition of macro 'mask'
16 | #define mask(k) (1<<k)
| ^
events.cpp: In function 'int main()':
events.cpp:13:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
13 | #define fin(x) freopen(x".inp","r",stdin)
| ~~~~~~~^~~~~~~~~~~~~~~~~~~
events.cpp:79:9: note: in expansion of macro 'fin'
79 | fin(task);
| ^~~
events.cpp:14:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
14 | #define fou(x) freopen(x".ans","w",stdout)
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~
events.cpp:80:9: note: in expansion of macro 'fou'
80 | fou(task);
| ^~~
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