Submission #340757

#	Time	Username	Problem	Language	Result	Execution time	Memory
340757		David_M	Red-blue table (IZhO19_stones)	C++14	Compilation error	0 ms	0 KiB

stones

#include <bits/stdc++.h> 
#define ll long long
#define pb push_back
#define F first
#define S second
using namespace std;
const ll N=1000006;
int n, m, q, o, u, e, l;
string x, y, a[1001];
 
int main(){ios_base::sync_with_stdio(false), cin.tie(0);
	cin>>q;
	while(q--){x="";o=u=0;e=n/2;
		cin>>n>>m;		
		if(n==1){cout<<m<<endl;while(m--)cout<<'-';cout<<'\n';continue;}
		if(m==1){cout<<n<<endl;while(n--)cout<<"+\n";continue;}
		if(n==2){cout<<m<<endl;M=m;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';continue;}
		if(m==2){cout<<n<<endl;while(n--)cout<<"++\n";continue;}
		if(n==3){cout<<m+1<<endl;M=m;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'+';cout<<'\n';continue;}
		if(m==3){cout<<n+1<<endl;while(n--)cout<<"++-\n";continue;}
		if(n==4){cout<<m+1<<endl;M=m;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'+';cout<<'\n';continue;}
		if(m==4){cout<<n+1<<endl;while(n--)cout<<"+++-\n";continue;}

		if(n%2==1&&m%2==1){
			if(n==1){cout<<m<<endl;while(m--)cout<<'-';cout<<'\n';continue;}
			if(m==1){cout<<n<<endl;while(n--)cout<<"+\n";continue;}
			
			cout<<n+m-2<<'\n';
			
			for (int i=1; i<=m/2; i++)x+='-';
			for (int i=1; i<=m/2+1; i++)x+='+';
			for (int i=1; i<=n/2; i++)cout<<x<<'\n';
			
			for (int i=0; i<m-1; i++)x[i]='-'; x[m-1]='+';
			cout<<x<<'\n';
			
			x="";
			for (int i=1; i<=m/2; i++)x+='+';
			for (int i=1; i<=m/2; i++)x+='-';
			x+='+';
			for (int i=1; i<=n/2; i++)cout<<x<<'\n';
		}
		if(n%2==0&&m%2==0)if(n<m)n--,o=1; else m--,u=1;
		
		if(n%2==1){
			for(int i=0; i<n; i++)for(int j=0; j<m; j++)a[i][j]='-';
			if(m+4-2*n>=0)l=n-2; else l=n-3;
			for (int i=0; i<m; i++)for (int j=i; j<i+e; j++)a[j%l][i]='+';
		}else{
			for(int i=0; i<n; i++)for(int j=0; j<m; j++)a[i][j]='+';
			if(n+4-2*m>=0)l=m-2; else l=m-3;
			for (int i=0; i<n; i++)for (int j=i; j<i+e; j++)a[i][j%l]='-';
		}	
		cout<<n*(m%2)+m*(n%2)+l<<endl;
		if(o==1)for (int i=0; i<m; i++)a[n][i]='-';
		if(u==1)for (int i=0; i<n; i++)a[i][m]='+';
		
		for(int i=0; i<n; i++){for(int j=0; j<m; j++)cout<<a[i][j];cout<<'\n';}	
	}
 
}

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:17:26: error: 'M' was not declared in this scope
   17 |   if(n==2){cout<<m<<endl;M=m;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';continue;}
      |                          ^
stones.cpp:19:28: error: 'M' was not declared in this scope
   19 |   if(n==3){cout<<m+1<<endl;M=m;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'+';cout<<'\n';continue;}
      |                            ^
stones.cpp:21:28: error: 'M' was not declared in this scope
   21 |   if(n==4){cout<<m+1<<endl;M=m;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'-';cout<<'\n';m=M;while(m--)cout<<'+';cout<<'\n';continue;}
      |                            ^
stones.cpp:34:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   34 |    for (int i=0; i<m-1; i++)x[i]='-'; x[m-1]='+';
      |    ^~~
stones.cpp:34:39: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   34 |    for (int i=0; i<m-1; i++)x[i]='-'; x[m-1]='+';
      |                                       ^
stones.cpp:43:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   43 |   if(n%2==0&&m%2==0)if(n<m)n--,o=1; else m--,u=1;
      |     ^