Submission #371002

#	Time	Username	Problem	Language	Result	Execution time	Memory
371002		FatihSolak	Poklon (COCI17_poklon)	C++17	0 / 140	4 ms	364 KiB

poklon

#include <bits/stdc++.h>
#define N 500005
using namespace std;
int arr[N];
int ans[N];
int cnt[N];
map<int,int> mp;
int block = 700;
bool comp(pair<pair<int,int>,int> a,pair<pair<int,int>,int> b){
	if(a.first.first/block == b.first.first/block){
		return a.first.second < b.first.second;
	}
	return a.first.first/block < b.first.first/block;
}
int t;
int sum;
void upd(int pos,int val){
	sum -= (cnt[arr[pos]] == 2);
	cnt[arr[pos]] += val;
	sum += (cnt[arr[pos]] == 2);
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	freopen("in.txt","r",stdin);
	freopen("out.txt","w",stdout);
	int n,q;
	cin >> n >> q;
	for(int i=1;i<=n;i++){
		int a;
		cin >> a;
		if(!mp[a])mp[a] = ++t;
		arr[i] = mp[a];
	}
	vector<pair<pair<int,int>,int>> query;
	for(int i=0;i<q;i++){
		int l,r;
		cin >> l >> r;
		query.push_back({{l,r},i});
	}
	sort(query.begin(), query.end(),comp);
	int l = 0,r = -1;
	for(auto u: query){
		int lq = u.first.first;
		int rq = u.first.second;
		while(l > lq){
			upd(--l,1);
		}
		while(r < rq){
			upd(++r,1);
		}
		while(l < lq){
			upd(l++,-1);
		}
		while(r > rq){
			upd(r--,-1);
		}
		ans[u.second] = sum;
	}
	for(int i=0;i<q;i++){
		cout << ans[i] << endl;
	}
}

Compilation message (stderr)

poklon.cpp: In function 'int main()':
poklon.cpp:25:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   25 |  freopen("in.txt","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~
poklon.cpp:26:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   26 |  freopen("out.txt","w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 140