Submission #927076

#	Time	Username	Problem	Language	Result	Execution time	Memory
927076		NintsiChkhaidze	Sum Zero (RMI20_sumzero)	C++17	22 / 100	1083 ms	11744 KiB

sumzero

#include <bits/stdc++.h>
#define ll long long
#define s second
#define f first
#define pb push_back
#define pii pair <int,int>
#define left (h<<1),l,(l + r)/2
#define right ((h<<1)|1),(l + r)/2 + 1,r
#define int ll
using namespace std;

const int N = 4e5 + 5;

int a[N],p[N],last[N];
signed main(){
	ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);

	int n;
	cin>>n;

	vector <int> vec;
	map <int,int> mp;
	vec.pb(0);
	for(int i=1;i<=n;i++){
		cin>>a[i];
		p[i]=p[i-1]+a[i];
		vec.pb(p[i]);
	}

	sort(vec.begin(),vec.end());
	int val=0;
	for (int i=0;i<vec.size();i++){
		if (!i || vec[i] != vec[i - 1]) {
			++val;
			mp[vec[i]] = val;
		}
	}

	for (int i = 0; i <= n; i++)
		p[i] = mp[p[i]],last[p[i]] = -1;

	int q;
	cin>>q;
	while(q--){
		int l,r,ans=0;
		cin>>l>>r;
		int R = l-1;
	
		last[p[l - 1]] = l - 1;
		for (int i = l; i <= r; i++){

			if (last[p[i]]>= R) {
				++ans;
				R = i;
			}
			
			last[p[i]] = i;
		}
		cout<<ans<<endl;

		for (int i=l-1;i<=r;i++)
			last[p[i]] = -1;
	}
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:32:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |  for (int i=0;i<vec.size();i++){
      |               ~^~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 0 / 39
• Subtask 3: 0 / 39