제출 #1262349

#제출 시각아이디문제언어결과실행 시간메모리
1262349icebearBuilding 4 (JOI20_building4)C++20
100 / 100
153 ms25860 KiB
// ~~ icebear ~~ #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> ii; typedef pair<int, ii> iii; template<class T> bool minimize(T &a, const T &b) { if (a > b) return a = b, true; return false; } template<class T> bool maximize(T &a, const T &b) { if (a < b) return a = b, true; return false; } #define FOR(i,a,b) for(int i=(a); i<=(b); ++i) #define FORR(i,a,b) for(int i=(a); i>=(b); --i) #define REP(i, n) for(int i=0; i<(n); ++i) #define RED(i, n) for(int i=(n)-1; i>=0; --i) #define MASK(i) (1LL << (i)) #define BIT(S, i) (((S) >> (i)) & 1) #define mp make_pair #define pb push_back #define fi first #define se second #define all(x) x.begin(), x.end() #define task "icebear" const int MOD = 1e9 + 7; const int inf = 1e9 + 27092008; const ll INF = 1e18 + 27092008; const int N = 1000000 + 5; int n, a[2][N]; int f[N][2][2]; void init(void) { cin >> n; REP(i, 2) FOR(j, 1, 2 * n) cin >> a[i][j]; } void process(void) { FOR(i, 0, 2 * n) FOR(j, 0, 1) { f[i][j][0] = inf; f[i][j][1] = -inf; } f[0][0][0] = f[0][0][1] = 0; f[0][1][0] = f[0][1][1] = 0; FOR(i, 0, 2 * n - 1) FOR(j, 0, 1) FOR(k, 0, 1) if (f[i][j][k] > -inf && f[i][j][k] < inf) { FOR(t, 0, 1) if (a[t][i + 1] >= a[j][i]) { minimize(f[i + 1][t][0], f[i][j][k] + (t == 0)); maximize(f[i + 1][t][1], f[i][j][k] + (t == 0)); } } cerr << f[2][0][1] << ' ' << f[2][0][0] << '\n'; int mn = min(f[2*n][0][0], f[2*n][1][0]); int mx = max(f[2*n][0][1], f[2*n][1][1]); cerr << mn << ' ' << mx << '\n'; if (mn <= n && n <= mx) { int cur = n; vector<char> res(2*n); int i = 2*n; while(i > 0) { if (f[i][0][0] <= cur && cur <= f[i][0][1] && (i == 2*n || a[0][i] <= a[(res[i] == 'A' ? 0 : 1)][i+1])) res[i-1] = 'A', cur--; else res[i-1] = 'B'; i--; } for(auto &c : res) cout << c; } else cout << -1; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); } int tc = 1; // cin >> tc; while(tc--) { init(); process(); } return 0; }

컴파일 시 표준 에러 (stderr) 메시지

building4.cpp: In function 'int main()':
building4.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
building4.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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