Submission #644978

#TimeUsernameProblemLanguageResultExecution timeMemory
644978ghostwriterBoat (APIO16_boat)C++14
0 / 100
257 ms2304 KiB
#include <bits/stdc++.h> using namespace std; #ifdef LOCAL #include <debug.h> #endif #define ft front #define bk back #define st first #define nd second #define ins insert #define ers erase #define pb push_back #define pf push_front #define _pb pop_back #define _pf pop_front #define lb lower_bound #define ub upper_bound #define mtp make_tuple #define bg begin #define ed end #define all(x) (x).bg(), (x).ed() #define sz(x) (int)(x).size() typedef long long ll; typedef unsigned long long ull; typedef double db; typedef long double ldb; typedef pair<int, int> pi; typedef pair<ll, ll> pll; typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll; typedef string str; template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); } template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; } #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i)) #define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i)) #define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i)) #define FSN(i, n) for (int (i) = (n) - 1; (i) >= 0; --(i)) #define EACH(i, x) for (auto &(i) : (x)) #define WHILE while #define file "TEST" mt19937 rd(chrono::steady_clock::now().time_since_epoch().count()); ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); } /* ---------------------------------------------------------------- END OF TEMPLATE ---------------------------------------------------------------- Tran The Bao - ghostwriter Training for VOI23 gold medal ---------------------------------------------------------------- DIT ME CHUYEN BAO LOC ---------------------------------------------------------------- */ const int M = 1e9 + 7; const int N = 505; int n, a[N], b[N], a1[N], b1[N], d[N][N], d1[N][N], rs = 1; signed main() { ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0); // freopen(file".inp", "r", stdin); // freopen(file".out", "w", stdout); cin >> n; FOR(i, 1, n) cin >> a[i] >> b[i]; FOR(i, 1, n) FOR(j, i, n) { FOR(z, i, j) { a1[z] = a[z]; b1[z] = b[z]; } FOR(z, i + 1, j) b1[z] = min(b1[z], b1[z - 1]); FOS(z, j - 1, i) a1[z] = max(a1[z], a1[z + 1]); bool ok = 1; FOR(z, i, j) if (a1[z] > b1[z]) ok = 0; if (!ok) continue; d1[i][j] = 1; FOR(z, i, j) d1[i][j] = 1LL * d1[i][j] * (b1[z] - a1[z] + 1) % M; } d[n + 1][0] = 1; FOS(i, n, 1) FOS(j, n - i, 0) { d[i][j] = 1LL * (b[i] - a[i] + 2) * d[i + 1][j] % M; FOR(z, 1, j) { if (i + z > n) break; d[i][j] = (d[i][j] + 1LL * d1[i][z] * d[i + z + 1][j - z] % M) % M; } } FOR(i, 1, n) rs = 1LL * rs * (b[i] - a[i] + 2) % M; FOR(i, 1, n - 1) if (i & 1) rs = (rs - d[1][i] + M) % M; else rs = (rs + d[1][i]) % M; cout << rs; return 0; } /* 2 1 2 2 3 ---------------------------------------------------------------- From Benq: stuff you should look for * int overflow, array bounds * special cases (n=1?) * do smth instead of nothing and stay organized * WRITE STUFF DOWN * DON'T GET STUCK ON ONE APPROACH ---------------------------------------------------------------- */

Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:57:5: note: in expansion of macro 'FOR'
   57 |     FOR(i, 1, n) cin >> a[i] >> b[i];
      |     ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:58:5: note: in expansion of macro 'FOR'
   58 |     FOR(i, 1, n)
      |     ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:59:5: note: in expansion of macro 'FOR'
   59 |     FOR(j, i, n) {
      |     ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:60:6: note: in expansion of macro 'FOR'
   60 |      FOR(z, i, j) {
      |      ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:64:6: note: in expansion of macro 'FOR'
   64 |      FOR(z, i + 1, j) b1[z] = min(b1[z], b1[z - 1]);
      |      ^~~
boat.cpp:31:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   31 | #define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
      |                               ^
boat.cpp:65:6: note: in expansion of macro 'FOS'
   65 |      FOS(z, j - 1, i) a1[z] = max(a1[z], a1[z + 1]);
      |      ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:67:6: note: in expansion of macro 'FOR'
   67 |      FOR(z, i, j)
      |      ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:72:6: note: in expansion of macro 'FOR'
   72 |      FOR(z, i, j) d1[i][j] = 1LL * d1[i][j] * (b1[z] - a1[z] + 1) % M;
      |      ^~~
boat.cpp:31:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   31 | #define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
      |                               ^
boat.cpp:75:5: note: in expansion of macro 'FOS'
   75 |     FOS(i, n, 1)
      |     ^~~
boat.cpp:31:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   31 | #define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
      |                               ^
boat.cpp:76:5: note: in expansion of macro 'FOS'
   76 |     FOS(j, n - i, 0) {
      |     ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:78:6: note: in expansion of macro 'FOR'
   78 |      FOR(z, 1, j) {
      |      ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:83:5: note: in expansion of macro 'FOR'
   83 |     FOR(i, 1, n) rs = 1LL * rs * (b[i] - a[i] + 2) % M;
      |     ^~~
boat.cpp:30:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
boat.cpp:84:5: note: in expansion of macro 'FOR'
   84 |     FOR(i, 1, n - 1)
      |     ^~~
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