제출 #321504

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
321504		ryansee	Red-blue table (IZhO19_stones)	C++14	100 / 100	57 ms	2412 KiB

stones

#include "bits/stdc++.h"
using namespace std;

#define FAST ios_base::sync_with_stdio(false); cin.tie(0);
#define pb push_back
#define eb emplace_back
#define ins insert
#define f first
#define s second
#define cbr cerr<<"hi\n"
#define mmst(x, v) memset((x), v, sizeof ((x)))
#define siz(x) ll(x.size())
#define all(x) (x).begin(), (x).end()
#define lbd(x,y) (lower_bound(all(x),y)-x.begin())
#define ubd(x,y) (upper_bound(all(x),y)-x.begin())
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());    //can be used by calling rng() or shuffle(A, A+n, rng)
inline long long rand(long long x, long long y) { return rng() % (y+1-x) + x; } //inclusivesss
string inline to_string(char c) {string s(1,c);return s;} template<typename T> inline T gcd(T a,T b){ return a==0?llabs(b):gcd(b%a,a); }

using ll=long long; 
using ld=long double;
#define FOR(i,s,e) for(ll i=s;i<=ll(e);++i)
#define DEC(i,s,e) for(ll i=s;i>=ll(e);--i)
using pi=pair<ll,ll>; using spi=pair<ll,pi>; using dpi=pair<pi,pi>; 

#define LLINF ((long long)1e18)
#define INF int(1e9+1e6)
#define MAXN (200006)
int main() {
	FAST
	ll t;
	cin>>t;
	while(t--){
		ll n, m;
		cin>>n>>m;
		vector<vector<char>> grid(n+1, vector<char>(m+1, '*'));
		auto bstar=[&](ll r,ll c){
			ll pad = n - r;
			ll need = n/2+1;
			need -= pad;
			if(c * need <= r * ((m+1)/2-1)) return 1;
			else return 0;
		};
		spi ans = spi(0, pi(0, 0));
		FOR(j,0,m) {
			ll st=0,en=n+1;
			while(en-st>1) {
				ll mid=(st+en)>>1;
				if(bstar(mid,j)) st=mid;
				else en=mid;
			}
			ans = max(ans, spi(j+st, pi(st, j)));
		}
		cout<<ans.f<<'\n';
		ll give = 1;
		auto betw=[&](ll a,ll x,ll b) {
			if(a>b) return false;
			--a,--x,--b;
			a%=ans.s.s, b%=ans.s.s;
			if(a<=b) return a <= x && x <= b;
			else return a <= x || x <= b;
		};
		FOR(i,1,ans.s.f) {
			ll until = give + (m+1)/2-1 - 1, ass = 0;
			FOR(j,1,m) if(j <= ans.s.s && betw(give, j, until)) {
				grid[i][j] = 'b';
			} else grid[i][j] = 'r', ++ ass;
			assert(ass > m/2);
			give = until + 1;
		}
		FOR(i,ans.s.f+1,n) {
			FOR(j,1,m) grid[i][j]='b';
		}
		FOR(i,1,n) FOR(j,1,m) { cout<<(grid[i][j]=='r'?'+':'-'); if(j==m) cout<<'\n'; }
	}
}

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