Submission #768437

#	Time	Username	Problem	Language	Result	Execution time	Memory
768437		Soumya1	Distributing Candies (IOI21_candies)	C++17	100 / 100	372 ms	38124 KiB

candies

#include "candies.h"
#include <bits/stdc++.h>
using namespace std;
const int mxN = 2e5 + 5;
long long mn[4 * mxN], mx[4 * mxN], lazy[4 * mxN];
void operate(int x, long long v) {
  mn[x] += v;
  mx[x] += v;
  lazy[x] += v;
}
void push(int x, int lx, int rx) {
  if (lx == rx) return;
  operate(x << 1, lazy[x]);
  operate(x << 1 | 1, lazy[x]);
  lazy[x] = 0;
}
void update(int x, int lx, int rx, int l, int r, int v) {
  if (lazy[x]) push(x, lx, rx);
  if (l > rx || lx > r) return;
  if (l <= lx && r >= rx) {
    operate(x, v);
    return;
  }
  int m = (lx + rx) >> 1;
  update(x << 1, lx, m, l, r, v);
  update(x << 1 | 1, m + 1, rx, l, r, v);
  mn[x] = min(mn[x << 1], mn[x << 1 | 1]);
  mx[x] = max(mx[x << 1], mx[x << 1 | 1]);
}
long long sum;
int query(int x, int lx, int rx, long long cmn, long long cmx, int c) {
  if (lazy[x]) push(x, lx, rx);
  if (lx == rx) {
    cmx = max(cmx, mx[x]);
    cmn = min(cmn, mn[x]);
    if (cmx - cmn < c) return sum - cmn;
    if (mx[x] < cmx) return sum - (cmx - c);
    return sum - cmn;
  }
  int m = (lx + rx) >> 1;
  if (max(cmx, mx[x << 1 | 1]) - min(cmn, mn[x << 1 | 1]) >= c) return query(x << 1 | 1, m + 1, rx, cmn, cmx, c);
  return query(x << 1, lx, m, min(cmn, mn[x << 1 | 1]), max(cmx, mx[x << 1 | 1]), c);
}
std::vector<int> distribute_candies(std::vector<int> c, std::vector<int> l, std::vector<int> r, std::vector<int> v) {
  int n = c.size();
  vector<pair<int, int>> updates[n];
  for (int i = 0; i < l.size(); i++) {
    updates[l[i]].push_back({i + 2, v[i]});
    if (r[i] < n - 1) updates[r[i] + 1].push_back({i + 2, -v[i]});
  }
  int Q = l.size() + 2;
  vector<int> ans(n);
  for (int i = 0; i < n; i++) {
    for (auto [j, val] : updates[i]) {
      sum += val;
      update(1, 1, Q, j, Q, val);
    }
    ans[i] = query(1, 1, Q, sum, sum, c[i]);
  }
  return ans;
}

Compilation message (stderr)

candies.cpp: In function 'std::vector<int> distribute_candies(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
candies.cpp:47:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |   for (int i = 0; i < l.size(); i++) {
      |                   ~~^~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 8 / 8
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29
• Subtask 5: 33 / 33