Submission #1092117

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092117		juicy	Weighting stones (IZhO11_stones)	C++17	100 / 100	27 ms	4460 KiB

stones

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 1e5 + 5;

int n;
int s[4 * N], mn[4 * N], mx[4 * N];

void upd(int i, int x, int id = 1, int l = 1, int r = n) {
  if (l == r) {
    s[id] = mn[id] = mx[id] = x;
    return;
  }
  int m = (l + r) / 2;
  if (i <= m) {
    upd(i, x, id * 2, l, m);
  } else {
    upd(i, x, id * 2 + 1, m + 1, r);
  }
  s[id] = s[id * 2] + s[id * 2 + 1];
  mn[id] = min(mn[id * 2] + s[id * 2 + 1], mn[id * 2 + 1]);
  mx[id] = max(mx[id * 2] + s[id * 2 + 1], mx[id * 2 + 1]);
}

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  cin >> n;
  for (int i = 0; i < n; ++i) {
    int r, s; cin >> r >> s;
    upd(r, s == 1 ? 1 : -1);
    cout << (mx[1] <= 0 ? '<' : (mn[1] >= 0 ? '>' : '?')) << "\n";
  }
  return 0;
}

• Subtask 1: 100 / 100