Submission #978954

#	Time	Username	Problem	Language	Result	Execution time	Memory
978954		NintsiChkhaidze	Sum Zero (RMI20_sumzero)	C++17	0 / 100	11 ms	33368 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
using namespace std;
 
const int N = 4e5 + 5;
 
int a[N],p[N],last[N];
int dp[N],d[23][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];
	}
 
	for (int i = n; i >= 1; 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 = 1; i <= n+1; i++)
		p[i] = mp[p[i]],last[p[i]] = 1e9;
 
	last[mp[0]] = n + 1;
	dp[n + 1] = 1e9;
	
	for (int i = n; i >= 1; i--){
		dp[i] = min(dp[i + 1],last[p[i]]);
		d[0][i] = dp[i];
		last[p[i]] = i;
	}
	d[0][n+1] = 1e9;
 
	for (int j = 1; j <= 18; j++){
		for (int i = 1; i <= n+1; i++){
			int l = d[j - 1][i];
			if (l >= 1e9) d[j][i] = 1e9;
			else d[j][i] = d[j - 1][l];
		}
	}
 
	int q;
	cin>>q;
 
	while(q--){
		int l,r;
		cin>>l>>r;
 
		int x = l,ans = 0;
		for (int i = 18; i >= 0; i--){
			if (d[i][x] <= r + 1){
				x = d[i][x];
				ans += (1<<i);
			}
		}
		cout<<ans<<endl;
	}
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:36:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |  for (int i=0;i<vec.size();i++){
      |               ~^~~~~~~~~~~

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