제출 #1264747

#제출 시각아이디문제언어결과실행 시간메모리
1264747dzhoz0Pictionary (COCI18_pictionary)C++20
140 / 140
45 ms3400 KiB
#include <bits/stdc++.h> using namespace std; #define int long long #define INF 1e18 #define f first #define s second #define pii pair<int, int> #define vi vector<int> const int MOD = 1'000'000'000 + 7; void setIO(string name = "") { ios_base::sync_with_stdio(0); cin.tie(0), cout.tie(0); #ifdef LOCAL freopen("inp.txt", "r", stdin); freopen("out.txt", "w", stdout); #else if (!name.empty()) { freopen((name + ".INP").c_str(), "r", stdin); freopen((name + ".OUT").c_str(), "w", stdout); } #endif } const int MAXN = 2e5; int par[MAXN + 5]; int sz[MAXN + 5]; int time_changed[MAXN + 5]; void make_set(int v) { par[v] = v; sz[v] = 1; } int find_set(int v, int time) { if(par[v] == v || time_changed[v] > time) return v; return find_set(par[v], time); } void union_set(int u, int v, int time) { u = find_set(u, time); v = find_set(v, time); if(u != v) { if(sz[u] < sz[v]) swap(u, v); par[v] = u; sz[u] += sz[v]; time_changed[v] = time; } } void solve() { int n, m, q; cin >> n >> m >> q; for(int i = 1; i <= n; i++) make_set(i); for(int i = 1; i <= m; i++) { int g = m - i + 1; for(int j = g * 2; j <= n; j += g) { union_set(g, j, i); } } while(q--) { int u, v; cin >> u >> v; int l = 0, r = m; int ans = m; while(l <= r) { int mid = (l + r) / 2; if(find_set(u, mid) == find_set(v, mid)) { ans = mid; r = mid - 1; } else l = mid + 1; } cout << ans << '\n'; } } signed main() { setIO(); int t = 1; // cin >> t; while (t--) solve(); }

컴파일 시 표준 에러 (stderr) 메시지

pictionary.cpp: In function 'void setIO(std::string)':
pictionary.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen((name + ".INP").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pictionary.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen((name + ".OUT").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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