Submission #414682

#	Time	Username	Problem	Language	Result	Execution time	Memory
414682		jamezzz	Worst Reporter 3 (JOI18_worst_reporter3)	C++14	100 / 100	725 ms	25160 KiB

worst_reporter3

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#include <ext/rope>
using namespace __gnu_cxx;
 
typedef tree<long long, null_type, less<long long>,
rb_tree_tag, tree_order_statistics_node_update> pbds;
//less_equal for identical elements
 
//#define DEBUG
 
#ifdef DEBUG
#define debug(...) printf(__VA_ARGS__);
#else
#define debug(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define sz(x) (int)x.size()
#define mnto(x,y) x=min(x,(__typeof__(x))y)
#define mxto(x,y) x=max(x,(__typeof__(x))y)
#define INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<int, int> ii;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vll;
 
int n,q,d[500005],t,l,r;
vector<int> v;
 
int calc(int tm,int x){
	//advance v[x] every v[x] seconds
	//starts at -x
	if(tm/v[x]>(1e9+x)/v[x])return INF;
	return tm/v[x]*v[x]-x;
}
 
int main(){
	sf("%d%d",&n,&q);
	for(int i=0;i<n;++i)sf("%d",&d[i]);
	v.pb(1);int cur=1;
	for(int i=0;i<n;++i){
		int nx=(d[i]+cur-1)/cur;
		if(nx>1e9/cur)break;
		cur*=nx;v.pb(cur);
	}
	n=sz(v);
	//earlier has further position
	for(int i=0;i<q;++i){
		sf("%d%d%d",&t,&l,&r);
		int lo=0,hi=n-1,mid,rlo=-1,rhi=-1;
		while(lo<=hi){
			mid=(lo+hi)/2;
			if(calc(t,mid)>=l){
				rlo=mid;
				lo=mid+1;
			}
			else hi=mid-1;
		}
		lo=0,hi=n-1;
		while(lo<=hi){
			mid=(lo+hi)/2;
			if(r>=calc(t,mid)){
				rhi=mid;
				hi=mid-1;
			}
			else lo=mid+1;
		}
		if(rhi==-1||rlo<rhi)pf("0\n");
		else pf("%d\n",rlo-rhi+1);
	}
}

Compilation message (stderr)

worst_reporter3.cpp: In function 'int main()':
worst_reporter3.cpp:52:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |  sf("%d%d",&n,&q);
      |    ^
worst_reporter3.cpp:53:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |  for(int i=0;i<n;++i)sf("%d",&d[i]);
      |                        ^
worst_reporter3.cpp:63:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |   sf("%d%d%d",&t,&l,&r);
      |     ^

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 81 / 81