#define _CRT_SECURE_NO_WARNINGS #include <iostream> #include <string> #include <algorithm> #include <cstring> #include <cstdio> #include <sstream> #include <map> #include <stack> #include <set> #include <queue> #include <unordered_set> #include <unordered_map> #include <math.h> #include <cmath> #include <vector> #include <iomanip> #include <random> #include <chrono> using namespace std; #define ll long long #define fr first #define sc second #define pb push_back #define US freopen("milkvisits.in", "r", stdin); freopen("milkvisits.out", "w", stdout); ll gcd(ll a, ll b) { if (a == 0 || b == 0) { return max(a, b); } if (a <= b) { return gcd(a, b % a); } else { return gcd(a % b, b); } } ll lcm(ll a, ll b) { return (a / gcd(a, b)) * b; } const int N = 300005; const ll oo = 1000000000000000, MOD = 1000000007; int sz = 1,t[3 * N][3]; void init(int n) { while (sz < n) { sz *= 2; } } int get(int l, int r, int i, int lx, int rx, int x) { if (lx - rx == 0) { t[x][i] = 0; return lx; } int m = (lx + rx) / 2, y = 1; if (t[2 * x + 1][i] > 0) { y = get(l, r, i, m + 1, rx, 2 * x + 1); } else { y= get(l, r, i, lx, m, 2 * x); } t[x][i] = t[2 * x][i] + t[2 * x + 1][i]; return y; } void seet(int ind, int i, int l, int r, int x) { if (r == l) { t[x][i] = 1; return; } int m = (l + r) / 2; if (ind <= m) { seet(ind, i, l, m, 2 * x); } else { seet(ind, i, m + 1, r, 2 * x + 1); } t[x][i] = t[2 * x][i] + t[2 * x + 1][i]; } void solve() { int q; cin >> q; int y = 0, mx = 0; init(q); while (q--) { int r, s; cin >> r >> s; if (r > mx) { mx = r, y = s; } if (s == 2) { int x = get(1, r, 1, 1, sz, 1); seet(r,2, 1, sz, 1); } else { int x=get(1, r, 2, 1, sz, 1); seet(r, 1, 1, sz, 1); } if (y == 2) { if (t[1][1] > 0) { cout << "?" << endl; } else { cout << "<" << endl; } } else { if (t[1][2] > 0) { cout << "?" << endl; } else { cout << ">" << endl; } } } } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); //US int tt = 1; //cin >> tt; while (tt--) { solve(); } }

stones.cpp: In function 'void solve()':
stones.cpp:99:17: warning: unused variable 'x' [-Wunused-variable]
   99 |             int x = get(1, r, 1, 1, sz, 1);
      |                 ^
stones.cpp:103:17: warning: unused variable 'x' [-Wunused-variable]
  103 |             int x=get(1, r, 2, 1, sz, 1);
      |                 ^