Submission #873480

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
873480	2023-11-15T07:07:04 Z	Danet	Strange Device (APIO19_strange_device)	C++14	Compilation error	0 ms	0 KB

strange_device

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")

#define tof_io  ios_base::sync_with_stdio(false);cin.tie(0) , cout.tie(0);
#define double  long double
#define int     long long
#define pb      push_back

#define all(x)  x.begin(),x.end()
#define endl    '\n'
#define sz(x) 	x.size()
//const int mod = 998244353; //998244353 1e9+7 1e9+9
const int N = 5e3 + 23;	
const int lg = 23;
const int inf = 1e9;
int fac[N];
int inv[N];
int add = 0;
//int  dnt_pow	(int a, int b, int md = mod){int ans = 1; while(b){if(b&1){ans = (a*ans)%md;}a = (a*a)%md;b >>= 1;}return ans ;}
//void dnt_bld	(){fac[0] = 1; inv[0] = dnt_pow(fac[0],mod-2) ;for(int i = 1 ; i < N ; i++) {fac[i] = (fac[i-1] * i) % mod;inv[i] = dnt_pow( fac[i] , mod-2);}}
//int  dnt_ncr	(int r,int n){if(r>n) return 0; return fac[n] * inv[r] % mod * inv[n-r] % mod;}
void add (set<pair<int, int>>& st, int l, int r) 
{
	auto it = st.lower_bound({l, 0}), tmp = it;
	if (it != st.begin() && (--tmp)->second >= l) 
	{
		l = tmp->first;
		r = max(r, tmp->second);
		st.erase(tmp);
	}
	while (it != st.end()) 
	{
		if (r >= it->first) 
		{
			r = max(r, it->second);
			it = st.erase(it);
		} 
		else break;
	}
	st.insert({l, r});
}
 
int32_t main () 
{
	int n, a, b;
	cin >> n >> a >> b;
	int mod;
	if (a / gcd(a, b+1) > inf / b) mod = inf;
	else mod = a / gcd(a, b+1) * b;
	set<pair<int, int>> st;
	while (n--) 
	{
		int l, r;
		cin >> l >> r;
		if (r-l+1 >= mod) 
		{
			cout << mod << endl;
			return 0;
		}
		if (l % mod > r % mod) 
		{
			add(st, 0, r % mod);
			add(st, l % mod, mod-1);
		} else add(st, l % mod, r % mod);
	}
	int ans = 0;
	for (auto& [l, r] : st) ans += r-l+1;
	cout << ans ;
	return 0;
}

Compilation message

strange_device.cpp:23:48: error: 'void add(std::set<std::pair<long long int, long long int> >&, long long int, long long int)' redeclared as different kind of entity
   23 | void add (set<pair<int, int>>& st, int l, int r)
      |                                                ^
strange_device.cpp:19:5: note: previous declaration 'long long int add'
   19 | int add = 0;
      |     ^~~
strange_device.cpp: In function 'int32_t main()':
strange_device.cpp:49:10: error: 'gcd' was not declared in this scope
   49 |  if (a / gcd(a, b+1) > inf / b) mod = inf;
      |          ^~~
strange_device.cpp:63:22: error: 'add' cannot be used as a function
   63 |    add(st, 0, r % mod);
      |                      ^
strange_device.cpp:64:26: error: 'add' cannot be used as a function
   64 |    add(st, l % mod, mod-1);
      |                          ^
strange_device.cpp:65:34: error: 'add' cannot be used as a function
   65 |   } else add(st, l % mod, r % mod);
      |                                  ^
strange_device.cpp:68:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   68 |  for (auto& [l, r] : st) ans += r-l+1;
      |             ^