Submission #648322

#	Time	Username	Problem	Language	Result	Execution time	Memory
648322		ghostwriter	Red-blue table (IZhO19_stones)	C++14	100 / 100	31 ms	2292 KiB

stones

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#else
#define debug(...)
#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 N = 1001;
int t, n, m;
char a[N][N];
pi rs;
void solve() {
	rs = {0, 0};
	cin >> n >> m;
	FOR(i, 0, n) {
		int rm = (n - i) * (m - m / 2 - 1), need = max(0, n / 2 + 1 - i);
		if (!need) rs = max(rs, {n - i + m, i});
		else rs = max(rs, {n - i + min(m, rm / need), i});
	}
	FOR(i, 1, rs.nd)
	FOR(j, 1, m)
		a[i][j] = '-';
	int rm = (n - rs.nd) * (m - m / 2 - 1), need = max(0, n / 2 + 1 - rs.nd);
	if (!need) {
		FOR(i, rs.nd + 1, n)
		FOR(j, 1, m)
			a[i][j] = (j <= m / 2 + 1? '+' : '-');
	}
	else {
		int pos = rs.nd + 1;
		FOR(i, 1, m) {
			if (rm < need) continue;
			FOR(j, 1, need) {
				a[pos][i] = '-';
				++pos;
				if (pos > n) pos = rs.nd + 1;
			}
			rm -= need;
		}
	}
	FOR(i, 1, n)
	FOR(j, 1, m)
		if (!a[i][j])
			a[i][j] = '+';
	cout << rs.st << '\n';
	FOR(i, 1, n) {
		FOR(j, 1, m) {
			cout << a[i][j];
			a[i][j] = 0;
		}
		cout << '\n';
	}
}
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 >> t;
    WHILE(t--) solve();
    return 0;
}
/*
----------------------------------------------------------------
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)

stones.cpp: In function 'void solve()':
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:58:2: note: in expansion of macro 'FOR'
   58 |  FOR(i, 0, n) {
      |  ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:63:2: note: in expansion of macro 'FOR'
   63 |  FOR(i, 1, rs.nd)
      |  ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:64:2: note: in expansion of macro 'FOR'
   64 |  FOR(j, 1, m)
      |  ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:68:3: note: in expansion of macro 'FOR'
   68 |   FOR(i, rs.nd + 1, n)
      |   ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:69:3: note: in expansion of macro 'FOR'
   69 |   FOR(j, 1, m)
      |   ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:74:3: note: in expansion of macro 'FOR'
   74 |   FOR(i, 1, m) {
      |   ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:76:4: note: in expansion of macro 'FOR'
   76 |    FOR(j, 1, need) {
      |    ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:84:2: note: in expansion of macro 'FOR'
   84 |  FOR(i, 1, n)
      |  ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:85:2: note: in expansion of macro 'FOR'
   85 |  FOR(j, 1, m)
      |  ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:89:2: note: in expansion of macro 'FOR'
   89 |  FOR(i, 1, n) {
      |  ^~~
stones.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
stones.cpp:90:3: note: in expansion of macro 'FOR'
   90 |   FOR(j, 1, m) {
      |   ^~~

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 16 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 31 / 31