Hello World !
放链接的效果是?
放代码的效果是?
1 #include <set> 2 #include <ctime> 3 #include <queue> 4 #include <cstdio> 5 #include <bitset> 6 #include <cctype> 7 #include <bitset> 8 #include <cstdlib> 9 #include <cassert> 10 #include <cstring> 11 #include <iostream> 12 #include <algorithm> 13 #define inf (1<<30) 14 #define INF (1ll<<62) 15 #define fi first 16 #define se second 17 #define rep(x,s,t) for(register int x=s,t_=t;x<t_;++x) 18 #define per(x,s,t) for(register int x=t-1,s_=s;x>=s_;--x) 19 #define prt(x) cout<<#x<<":"<<x<<" " 20 #define prtn(x) cout<<#x<<":"<<x<<endl 21 #define pb(x) push_back(x) 22 #define hash asfmaljkg 23 #define rank asfjhgskjf 24 #define y1 asggnja 25 #define y2 slfvm 26 using namespace std; 27 typedef long long ll; 28 typedef pair<int,int> ii; 29 template<class T>void sc(T &x){ 30 int f=1;char c;x=0; 31 while(c=getchar(),c<48)if(c=='-')f=-1; 32 do x=x*10+(c^48); 33 while(c=getchar(),c>47); 34 x*=f; 35 } 36 template<class T>void nt(T x){ 37 if(!x)return; 38 nt(x/10); 39 putchar(x%10+'0'); 40 } 41 template<class T>void pt(T x){ 42 if(x<0)putchar('-'),x=-x; 43 if(!x)putchar('0'); 44 else nt(x); 45 } 46 template<class T>void ptn(T x){ 47 pt(x);putchar('\n'); 48 } 49 template<class T>void pts(T x){ 50 pt(x);putchar(' '); 51 } 52 template<class T>inline void Max(T &x,T y){if(x<y)x=y;} 53 template<class T>inline void Min(T &x,T y){if(x>y)x=y;} 54 55 int main(){ 56 // freopen("pro.in","r",stdin); 57 // freopen("chk.out","w",stdout); 58 // int cas;sc(cas); 59 // while(cas--)solve(); 60 61 return 0; 62 }
LaTeX的效果是?
$n≤100,ans=\sum_{i=1}^{n} a_i mod (10^9+7)$