Nauuo and Chess
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Nauuo and Chess
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?https://codeforces.com/contest/1173/problem/B
題意:在m*m的棋盤上放置n個棋子,使得任意兩個棋子的坐標和編號滿足,求最小m及其n個棋子的放置位置
題解:構造+思維
1、
1 2 0 0 * 00 3 4 0 * 00 0 5 6 * 0* * * * * 0 0 0 0 0 0 n或者
1 2 0 0 * 00 3 4 0 * 00 0 5 6 * 0* * * * * n 0 0 0 0 0 02、m=(n+2)/2
證明:
/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; int ans,cnt,flag,temp,sum; int a[N]; char str; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d",&n);cout<<(n+2)/2<<endl;for(int i=1;i<=n;i++){cout<<(i+1)/2<<" "<<(i+2)/2<<endl;}//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }?
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