제출 #887257

#제출 시각아이디문제언어결과실행 시간메모리
887257vjudge1Swap (BOI16_swap)C++17
100 / 100
125 ms49220 KiB
#include <bits/stdc++.h> using namespace std; const int N = 2e5 + 10; int n, a[N]; unordered_map<int, int> mp[N]; int ind(int v, int x) { if (mp[v].find(x) != mp[v].end()) return mp[v][x]; if (v * 2 > n) return mp[v][x] = v; if (x < a[v * 2] && x < a[v * 2 + 1]) return mp[v][x] = v; if (a[v * 2] < x && a[v * 2] < a[v * 2 + 1]) return mp[v][x] = ind(v * 2, x); else { int mn = min(x, a[v * 2]), mx = max(x, a[v * 2]); if (ind(v * 2, mn) < ind(v * 2 + 1, mn)) if (x == mn) return mp[v][x] = ind(v * 2, x); else return mp[v][x] = ind(v * 2 + 1, x); else if (x == mn) return mp[v][x] = ind(v * 2 + 1, x); else return mp[v][x] = ind(v * 2, x); } } int main() { ios:: sync_with_stdio(0), cin.tie(0); cin >> n; memset(a, 63, sizeof a); for (int i = 1; i <= n; i++) cin >> a[i]; for (int i = 1; i <= n; i++) { if (i * 2 > n) continue; if (a[i] < a[i * 2] && a[i] < a[i * 2 + 1]) continue; if (a[i * 2] < a[i] && a[i * 2] < a[i * 2 + 1]) swap(a[i * 2], a[i]); else { int mn = min(a[i], a[i * 2]), mx = max(a[i], a[i * 2]); swap(a[i * 2 + 1], a[i]); if (ind(i * 2, mn) < ind(i * 2 + 1, mn)) a[i * 2] = mn, a[i * 2 + 1] = mx; else a[i * 2] = mx, a[i * 2 + 1] = mn; } } for (int i = 1; i <= n; i++) cout << a[i] << ' '; cout << '\n'; }

컴파일 시 표준 에러 (stderr) 메시지

swap.cpp: In function 'int ind(int, int)':
swap.cpp:15:36: warning: unused variable 'mx' [-Wunused-variable]
   15 |         int mn = min(x, a[v * 2]), mx = max(x, a[v * 2]);
      |                                    ^~
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