제출 #558181

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
558181		Sweezy	Boat (APIO16_boat)	C++17	0 / 100	2090 ms	18264 KiB

boat

#include <bits/stdc++.h>
 
using namespace std;
#define int long long
 
template <typename A, typename B>
string to_string(pair<A, B> p);
 
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);
 
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);
 
string to_string(const string& s) {
  return '"' + s + '"';
}
 
string to_string(const char* s) {
  return to_string((string) s);
}
 
string to_string(bool b) {
  return (b ? "true" : "false");
}
 
string to_string(vector<bool> v) {
  bool first = true;
  string res = "{";
  for (int i = 0; i < static_cast<int>(v.size()); i++) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(v[i]);
  }
  res += "}";
  return res;
}
 
template <size_t N>
string to_string(bitset<N> v) {
  string res = "";
  for (size_t i = 0; i < N; i++) {
    res += static_cast<char>('0' + v[i]);
  }
  return res;
}
 
template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}
 
template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
 
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}
 
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}
  
void debug_out() { cerr << endl; }
 
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}
 
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
 
#define all(a) (a).begin(), (a).end()
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define reps(i, s, n) for (int i = s; i < (n); ++i)
#define pb push_back
#define sz(a) (int) (a.size())
 
const int mod = 1e9 + 7;
 
void solve() {
  int n;
  cin >> n;
  vector<int> l(n), r(n), cs;
  rep(i, n) {
    cin >> l[i] >> r[i];
    cs.pb(l[i]);
    cs.pb(r[i] + 1);
  }
 
  sort(all(cs));
  cs.erase(unique(all(cs)), cs.end());
  vector<pair<int, int>> segs;
  rep(i, sz(cs) - 1) {
    segs.emplace_back(cs[i], cs[i + 1] - 1);
  }
  segs.emplace_back(cs.back(), cs.back());
 
  debug(segs);
 
  auto add = [&] (int &a, int b) -> void {
    (a += b) %= mod;
  };
 
  auto mul = [&] (int a, int b) {
    return a * b % mod;
  };
 
  auto binpow = [&] (int a, int n) {
    int res = 1;
    while (n) {
      if (n % 2) {
        res = mul(res, a);
      }
      a = mul(a, a);
      n /= 2;
    }
    return res;
  };
 
  auto inv = [&] (int val) {
    return binpow(val, mod - 2);
  };
 
  vector<int> f(n + 1), rf(n + 1);
  f[0] = rf[0] = 1;
  reps(i, 1, n + 1) {
    f[i] = mul(f[i - 1], i);
    rf[i] = inv(f[i]);
  }
 
  auto choose = [&] (int n, int k) {
    int res = 1;
    reps(i, 1, k + 1) {
      res = mul(res, n - k + i);
    }
    return mul(res, rf[k]);
  };
 
  auto sub = [&] (int a, int b) {
    a -= b;
    if (a < 0) a += mod;
    return a;
  };
 
  vector<vector<int>> C(sz(segs), vector<int> (n + 1)), Cs(n + 1, vector<int> (n + 1));
  rep(i, sz(segs)) {
    rep(j, min(segs[i].second - segs[i].first + 1, n) + 1) {
      C[i][j] = choose(segs[i].second - segs[i].first + 1, j);
    }
  }

  vector<vector<int>> dp(n + 1, vector<int> (sz(segs))), p(n + 1, vector<int> (sz(segs)));
  rep(i, n) {
    vector<vector<int>> ndp(n + 1, vector<int> (sz(segs)));
    rep(seg, sz(segs)) {
      if (segs[seg].first < l[i] || segs[seg].second > r[i]) continue;
      reps(cnt, 1, n + 1) {
        reps(ts, 1, min(cnt, segs[seg].second - segs[seg].first + 1) + 1) {
          if (cnt == ts) {
            add(ndp[cnt][seg], C[seg][ts]);
          } else if (seg > 0) {
            // add(ndp[cnt][seg], mul(C[seg][ts], p[cnt - ts][seg - 1]));
            rep(prev, seg) {
              add(ndp[cnt][seg], mul(dp[cnt - ts][prev], C[seg][ts]));
            }
          }
        }
      }
    }
    rep(j, n + 1) {
      rep(k, sz(segs)) {
        add(dp[j][k], ndp[j][k]);
      }
      p[j][0] = dp[j][0];
      reps(k, 1, sz(segs)) {
        p[j][k] = dp[j][k];
        add(p[j][k], p[j][k - 1]); 
      }
    }
  }


  int res = 0;
  rep(i, n + 1) {
    rep(j, sz(segs)) {
      add(res, dp[i][j]);
    }
  }

  cout << res;
}
 
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  solve();
  return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

boat.cpp: In function 'void solve()':
boat.cpp:91:20: warning: statement has no effect [-Wunused-value]
   91 | #define debug(...) 42
      |                    ^~
boat.cpp:120:3: note: in expansion of macro 'debug'
  120 |   debug(segs);
      |   ^~~~~
boat.cpp:161:8: warning: variable 'sub' set but not used [-Wunused-but-set-variable]
  161 |   auto sub = [&] (int a, int b) {
      |        ^~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42