Submission #684619

#	Time	Username	Problem	Language	Result	Execution time	Memory
684619		penguin133	Sum Zero (RMI20_sumzero)	C++17	61 / 100	114 ms	13200 KiB

sumzero

#include <bits/stdc++.h>
using namespace std;

//#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif

int n, A[100005], q, lft[100005];
int par[20][100005];
map <int, int> mp;

void solve(){
	cin >> n;
	for(int i=1;i<=n;i++)cin >> A[i];
	mp[0] = 0;
	int cur = 0;
	for(int i=1;i<=n;i++){
		cur += A[i];
		if(mp.find(cur) == mp.end())lft[i] = -1;
		else lft[i] = mp[cur];
		mp[cur] = i;
	}
	lft[0] = -1;
	for(int i=1;i<=n;i++)lft[i] = max(lft[i], lft[i-1]);
	for(int i=0;i<=n;i++)par[0][i] = lft[i];
	for(int i=1;i<=19;i++)for(int j=0;j<=n;j++)par[i][j] = (par[i-1][j] != -1 ? par[i-1][par[i-1][j]] : -1);
	cin >> q;
	while(q--){
		int l, r; cin >> l >> r;
		int tmp = r, ans = 0;
		for(int i=19;i>=0;i--){
			if(par[i][tmp] >= l - 1)tmp = par[i][tmp], ans += (1 << i);
		}
		cout << ans << '\n';
	}
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

sumzero.cpp:43:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   43 | main(){
      | ^~~~

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