Submission #286873

#	Time	Username	Problem	Language	Result	Execution time	Memory
286873		dvdg6566	Red-blue table (IZhO19_stones)	C++14	11 / 100	32 ms	1400 KiB

stones

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pi;
typedef vector<ll> vi;
typedef vector<pi> vpi;
#define pb emplace_back
#define mp make_pair
#define f first
#define s second
#define SZ(x) (int)x.size()
#define ALL(x) x.begin(),x.end()
#define lb lower_bound
const int MAXN=1001;
const ll MOD=998244353;

ll A[MAXN][MAXN];
ll R,C,T;

int eval(){
	int ans=0;
	for(int i=0;i<R;++i){
		int colp=0;
		for(int j=0;j<C;++j)if(A[i][j]==0)++colp;
		if(colp*2 > C)++ans;
	}
	for(int i=0;i<C;++i){
		int colc=0;
		for(int j=0;j<R;++j)if(A[j][i])++colc;
		if(colc*2>R)++ans;
	}
	return ans;
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>T;
	while(T--){
		cin>>R>>C;
		

		if(R==1){
			cout<<C<<'\n';
			for(int i=0;i<C;++i)cout<<'-';cout<<'\n';
			continue;
		}else if(C==1){
			cout<<R<<'\n';
			for(int i=0;i<R;++i){cout<<'+';cout<<'\n';}
			continue;
		}
		if(R%2==1&&C%2==1){
			cout<<R+C-2<<'\n';

			for(int i=0;i<C;++i)cout<<'-';cout<<'\n';
			int h=C/2;
			for(int i=1;i<R;++i){
				if(i%2==1){
					cout<<'+';
					for(int k=0;k<h;++k)cout<<'+';
					for(int k=0;k<h;++k)cout<<'-';
				}else{
					cout<<'+';
					for(int k=0;k<h;++k)cout<<'-';
					for(int k=0;k<h;++k)cout<<'+';
				}
				cout<<'\n';
			}
		}else if(R%2==0&&C%2==0){
			
			int perow=(C-2)/2;
			int tar= R*((C/2)-1);

			tar /= (R/2+1);

			int cur=0;
			for(int i=0;i<R;++i){
				for(int ww=0;ww<perow;++ww){
					A[i][cur] = 1;
					++cur;
					cur%=tar;
				}
			}
			assert(eval()+4>=R+C);
			cout<<eval()<<'\n';
			// break;
			for(int i=0;i<R;++i){
				for(int j=0;j<C;++j){
					if(A[i][j])cout<<'-';
					else cout<<'+';
				}
				cout<<'\n';
			}
		}
		// return 0;
	}	
}

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:44:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   44 |    for(int i=0;i<C;++i)cout<<'-';cout<<'\n';
      |    ^~~
stones.cpp:44:34: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   44 |    for(int i=0;i<C;++i)cout<<'-';cout<<'\n';
      |                                  ^~~~
stones.cpp:54:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   54 |    for(int i=0;i<C;++i)cout<<'-';cout<<'\n';
      |    ^~~
stones.cpp:54:34: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   54 |    for(int i=0;i<C;++i)cout<<'-';cout<<'\n';
      |                                  ^~~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 11 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31