結果
| 問題 | 
                            No.1384 Bishop and Rook
                             | 
                    
| コンテスト | |
| ユーザー | 
                             kmjp
                         | 
                    
| 提出日時 | 2021-02-11 02:19:30 | 
| 言語 | C++17  (gcc 13.3.0 + boost 1.87.0)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 1,770 ms / 2,000 ms | 
| コード長 | 2,058 bytes | 
| コンパイル時間 | 2,243 ms | 
| コンパイル使用メモリ | 199,600 KB | 
| 最終ジャッジ日時 | 2025-01-18 17:12:11 | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge2 / judge3 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 1 | 
| other | AC * 55 | 
ソースコード
#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------
int T,H,W;
void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>T;
	while(T--) {
		cin>>H>>W;
		if(H==1&&W==1) {
			cout<<0<<endl;
			cout<<"1 1"<<endl;
			continue;
		}
		if(H%2||W%2) {
			cout<<-1<<endl;
			continue;
		}
		cout<<H*W-1<<endl;
		if(H==2) {
			for(x=0;x<W;x+=2) {
				cout<<1<<" "<<x+1<<endl;
				cout<<2<<" "<<x+2<<endl;
				cout<<2<<" "<<x+1<<endl;
				cout<<1<<" "<<x+2<<endl;
			}
		}
		else if(W==2) {
			for(y=0;y<H;y+=2) {
				cout<<y+1<<" "<<1<<endl;
				cout<<y+2<<" "<<2<<endl;
				cout<<y+1<<" "<<2<<endl;
				cout<<y+2<<" "<<1<<endl;
			}
		}
		else {
			for(y=0;y<H;y+=2) {
				if(y%4==0) {
					// right
					cout<<y+1<<" "<<2<<endl;
					cout<<y+2<<" "<<1<<endl;
					cout<<y+1<<" "<<1<<endl;
					cout<<y+2<<" "<<2<<endl;
					for(x=2;x<W;x+=2) {
						cout<<y+2<<" "<<x+1<<endl;
						cout<<y+1<<" "<<x+2<<endl;
						cout<<y+1<<" "<<x+1<<endl;
						cout<<y+2<<" "<<x+2<<endl;
					}
				}
				else {
					for(x=W-2;x>=2;x-=2) {
						cout<<y+1<<" "<<x+2<<endl;
						cout<<y+2<<" "<<x+1<<endl;
						cout<<y+2<<" "<<x+2<<endl;
						cout<<y+1<<" "<<x+1<<endl;
					}
					cout<<y+1<<" "<<x+2<<endl;
					cout<<y+2<<" "<<x+1<<endl;
					cout<<y+1<<" "<<x+1<<endl;
					cout<<y+2<<" "<<x+2<<endl;
				}
			}
		}
		
		
	}
}
int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}
            
            
            
        
            
kmjp