#include <bits/stdc++.h> #define int long long #define pii pair < int, int > #define fi first #define se second const int inf = 1e18; const int maxn = 1e5 + 5; const int offset = 1e6; using namespace std; #define mask(x) (1ll << x) int n; struct NODE { int mx, mn, lz; NODE () { mx = 0; mn = 0; lz = 0; } NODE operator+ (const NODE &other) const { NODE res; res.mx = max(mx, other.mx); res.mn = min(mn, other.mn); return res; } } t[4 * maxn]; NODE base; void push(int id, int l, int r) { if (t[id].lz == 0) return; for (int j = 0; j <= 1; j++) { t[id * 2 + j].mx += t[id].lz; t[id * 2 + j].mn += t[id].lz; t[id * 2 + j].lz += t[id].lz; } t[id].lz = 0; } void update(int id, int l, int r, int u, int v, int val) { if (l > v || r < u) return; if (l >= u && r <= v) { t[id].lz += val; t[id].mx += val; t[id].mn += val; return; } push(id, l, r); int m = (l + r) / 2; update(id * 2, l, m, u, v, val); update(id * 2 + 1, m + 1, r, u, v, val); t[id] = t[id * 2] + t[id * 2 + 1]; } NODE get(int id, int l, int r, int u, int v) { if (l > v || r < u) return base; if (l >= u && r <= v) return t[id]; int m = (l + r) / 2; return get(id * 2, l, m, u, v) + get(id * 2 + 1, m + 1, r, u , v); } signed main() { ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define NAME "test" if (fopen(NAME".INP","r")) { freopen(NAME".INP","r",stdin); freopen(NAME".OUT","w",stdout); } cin >> n; for (int i = 1; i <= n; i++) { int R, S; cin >> R >> S; int x; if (S == 1) x = 1; else x = -1; update(1, 1, n, 1, R, x); int mx = t[1].mx; int mn = t[1].mn; if (mn >= 0 && mx > 0) { cout << '>'; } else if (mx <= 0 && mn < 0) { cout << '<'; } else cout << '?'; cout << '\n'; } }

stones.cpp: In function 'int main()':
stones.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(NAME".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
stones.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(NAME".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~