Submission #773244

#	Time	Username	Problem	Language	Result	Execution time	Memory
773244		Sam_a17	Sum Zero (RMI20_sumzero)	C++17	61 / 100	228 ms	36124 KiB

sumzero

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
// #include <atcoder/all>
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int((x).size()))
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
void print(long double t) {cerr << t;}
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T> void print(T v[],T n) {cerr << "["; for(int i = 0; i < n; i++) {cerr << v[i] << " ";} cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
long long ka() {
	long long x = 0;
	bool z = false;
	while (1)
	{
		char y = getchar();
		if (y == '-')
			z = true;
		else if ('0' <= y && y <= '9')
			x = x * 10 + y - '0';
		else
		{
			if (z)
				x *= -1;
			return x;
		}
	}
}
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  if (str != "") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  } else if(str == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  }
}
 
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 4e5 + 2;
long long n, p[N];
int ans[N];
int li[N], ri[N];
int l[N], r[N];

vector<pair<pair<int, int>, int>> qrs;
deque<int> ups;

void dfs(int node, int parent) {  
  if(li[node] != -1) {
    for(int i = li[node]; i <= ri[node]; i++) {
      auto it = upper_bound(all(ups), qrs[i].first.second) - ups.begin() - 1;
      ans[qrs[i].second] = it + 1;
    }
  }
  
  if(l[node] == -1) return;
  for(int i = l[node]; i <= r[node]; i++) {
    ups.push_front(node);
    dfs(i, node);
    ups.pop_front();
  }
}
 
void solve_() {
  cin >> n;
 
  vector<long long> compress;
  compress.push_back(0);
  vector<int> lst(n + 1), up(n + 1), a(n + 1);
  for(int i = 1; i <= n; i++) {
    cin >> a[i];
    p[i] = p[i - 1] + a[i];
    compress.push_back(p[i]);
  }

  {
    vector<int> emp;
    a.swap(emp);
  }
 
  sort(all(compress));
  uniq(compress);

 
  for(int i = 0; i <= n; i++) {
    p[i] = lower_bound(all(compress), p[i]) - compress.begin();
    lst[i] = -1;

    ////
    l[i] = r[i] = -1;
    li[i] = ri[i] = -1;
  }


  {
    vector<long long> emp;
    compress.swap(emp);
  }

  lst[p[n]] = n;
  up[n] = n + 1;

  l[n + 1] = r[n + 1] = n;

  for(int i = n - 1; i >= 0; i--) {
    up[i] = up[i + 1];
    if(lst[p[i]] != -1) {
      up[i] = min(up[i], lst[p[i]]);
    }

    if(l[up[i]] == -1) {
      l[up[i]] = r[up[i]] = i; 
    } else {
      l[up[i]] = i;
    }

    lst[p[i]] = i;
  }

  
  {
    vector<int> emp, emp2;
    lst.swap(emp);
    up.swap(emp);
  }


  int q; cin >> q;
  for(int i = 1; i <= q; i++) {
    int l, r; cin >> l >> r;
    l--;
    qrs.push_back({{l, r}, i});
  }

  sort(all(qrs));

  for(int i = 0; i < sz(qrs); i++) {
    if(li[qrs[i].first.first] == -1) {
      li[qrs[i].first.first] = i;
      ri[qrs[i].first.first] = i;
    } else {
      ri[qrs[i].first.first] = i;
    }
  }

  dfs(n + 1, 0);

  for(int i = 1; i <= q; i++) {
    cout << ans[i] << '\n';
  }
}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    while(test_case--) {
      solve_();
    }
  };
 
  int test_cases = 1; 
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'void setIO(std::string)':
sumzero.cpp:88:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:89:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:91:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:92:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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