VFK太神了!
感觉vfk出的p1,p3都挺赞的。
p1 重量平衡树的实际应用。
p2 无脑数论（感觉就是jzpkil的弱化版）
p3 给坐地铁时出题的跪了！
#include<cstdio> #include<cstring> #include<algorithm> #include<set> #include<vector> #include<map> #include<queue> #include<string> #include<bitset> #include<iomanip> #include<iostream> #include<cmath> using namespace std; #define rep(i,x,y) for(i=x;i<=y;i++) #define _rep(i,x,y) for(i=x;i>=y;i--) #define REP(i,x,y) for(int i=(x);i<=(y);i++) #define _REP(i,x,y) for(int i=(x);i>=(y);i--) #define CL(S,x) memset(S,x,sizeof(S)) #define CP(S1,S2) memcpy(S1,S2,sizeof(S2)) #define ALL(x,S) for(x=S.begin();x!=S.end();x++) #define pb push_back #define IN insert #define ER erase #define BE begin() #define ED end() #define LB lower_bound #define UB upper_bound #define mp make_pair #define fi first #define se second #define upmin(x,y) x=min(x,y) #define upmax(x,y) x=max(x,y) #define COUT(S,x) cout<<fixed<<setprecision(x)<<S<<endl template<class T> inline void read(T&x){bool fu=0;char c;for(c=getchar();c<=32;c=getchar());if(c=='-')fu=1,c=getchar();for(x=0;c>32;c=getchar())x=x*10+c-'0';if(fu)x=-x;}; template<class T> inline void read(T&x,T&y){read(x);read(y);} template<class T> inline void read(T&x,T&y,T&z){read(x);read(y);read(z);} inline char getc(){char c;for(c=getchar();c<=32;c=getchar());return c;} typedef long long ll; typedef long double ld; typedef pair<int,int> pii; const int N=100010; const int D=5000010; const ll S=ll(1e18); const ld lit=0.8; int n,m,i,j,k,p,x,y,z,res,op; int A[N]; int cnt; int R; int tot;pii w[D],now;ll v[D]; int sgn(int a,int b){if(v[a]==v[b])return 0;return v[a]>v[b]?1:-1;} int pd(pii a,pii b){ int t=sgn(a.fi,b.fi); if(t==0)return sgn(a.se,b.se); return t; } struct Tree{ int sz[D],ch[D][2],num[D]; int li[D]; void dfs(int i){if(i==0)return;dfs(ch[i][0]);li[++li[0]]=i;dfs(ch[i][1]);} int bui(ll x,ll y,int l,int r) { if(l>r)return 0; ll mid=(x+y)/2; int z=(l+r)/2,i=li[z]; v[num[i]]=mid;sz[i]=1; ch[i][0]=bui(x,mid-1,l,z-1); ch[i][1]=bui(mid+1,y,z+1,r); sz[i]=sz[ch[i][0]]+sz[ch[i][1]]+1; return i; } int rebui(int i,ll x,ll y) { li[0]=0;dfs(i); return bui(x,y,1,li[0]); } int ins(int i,ll x,ll y) { ll mid=(x+y)/2; if(i==0) { i=++tot;sz[i]=1; v[tot]=mid; w[tot]=now; num[i]=tot; op=tot; return i; } int t=pd(now,w[num[i]]); if(t==0){op=num[i];return i;} if(t==-1)ch[i][0]=ins(ch[i][0],x,mid-1); else ch[i][1]=ins(ch[i][1],mid+1,y); sz[i]=sz[ch[i][0]]+sz[ch[i][1]]+1; if(max(sz[ch[i][0]],sz[ch[i][1]])>=sz[i]*lit)i=rebui(i,x,y); return i; } }Z; void upd(int&x,int y,int z){if(v[A[y]]>=v[A[z]])x=y;else x=z;} struct seg{ int ms[N<<2]; void U(int i){upd(ms[i],ms[i*2],ms[i*2+1]);} void ins(int i,int x,int y,int d) { if(x==y) { R=Z.ins(R,1,S); A[x]=op; ms[i]=x; return; } if(d<=(x+y)/2)ins(i*2,x,(x+y)/2,d); else ins(i*2+1,(x+y)/2+1,y,d); U(i); } void find(int i,int x,int y,int l,int r) { if(y<l||x>r)return; if(x>=l&&y<=r) { if(res==-1)res=ms[i]; else upd(res,res,ms[i]); return; } find(i*2,x,(x+y)/2,l,r);find(i*2+1,(x+y)/2+1,y,l,r); } void bui(int i,int x,int y) { if(x==y)ms[i]=x; else{bui(i*2,x,(x+y)/2);bui(i*2+1,(x+y)/2+1,y);U(i);} } }T; int main() { freopen("number.in","r",stdin); freopen("number.out","w",stdout); read(n,m); T.bui(1,1,n); int ca=0; for(;m;m--) { ++ca; //printf("ca=%d ",ca); char c=getc(); if(c=='C') { read(now.fi,now.se,z); now.fi=A[now.fi]; now.se=A[now.se]; T.ins(1,1,n,z); } else { read(x,y); res=-1;T.find(1,1,n,x,y); printf("%d ",res); } } return 0; }
#include<cstring> #include<algorithm> #include<set> #include<vector> #include<map> #include<queue> #include<string> #include<bitset> #include<iomanip> #include<iostream> #include<cmath> using namespace std; #define rep(i,x,y) for(i=x;i<=y;i++) #define _rep(i,x,y) for(i=x;i>=y;i--) #define REP(i,x,y) for(int i=(x);i<=(y);i++) #define _REP(i,x,y) for(int i=(x);i>=(y);i--) #define CL(S,x) memset(S,x,sizeof(S)) #define CP(S1,S2) memcpy(S1,S2,sizeof(S2)) #define ALL(x,S) for(x=S.begin();x!=S.end();x++) #define pb push_back #define IN insert #define ER erase #define BE begin() #define ED end() #define LB lower_bound #define UB upper_bound #define mp make_pair #define fi first #define se second #define upmin(x,y) x=min(x,y) #define upmax(x,y) x=max(x,y) #define COUT(S,x) cout<<fixed<<setprecision(x)<<S<<endl template<class T> inline void read(T&x){bool fu=0;char c;for(c=getchar();c<=32;c=getchar());if(c=='-')fu=1,c=getchar();for(x=0;c>32;c=getchar())x=x*10+c-'0';if(fu)x=-x;}; template<class T> inline void read(T&x,T&y){read(x);read(y);} template<class T> inline void read(T&x,T&y,T&z){read(x);read(y);read(z);} inline char getc(){char c;for(c=getchar();c<=32;c=getchar());return c;} typedef long long ll; typedef long double ld; typedef pair<int,int> pii; const int N=110; const int mod=int(1e9)+7; ll n,w,x,i,j,k,l,p; ll B[N],C[N][N]; ll a[1010],b[1010]; ll P(ll a,ll b){ll ans=1;for(a%=mod;b;b>>=1,a=a*a%mod)if(b&1)ans=ans*a%mod;return ans;} int main() { //freopen("1.in","r",stdin);freopen("1.out","w",stdout); rep(i,0,105){C[i][0]=1;rep(j,1,i)C[i][j]=(C[i-1][j-1]+C[i-1][j])%mod;} B[0]=1; rep(i,1,105) { B[i]=i+1; rep(j,0,i-1) B[i]=(B[i]-C[i+1][j]*B[j])%mod; B[i]=B[i]*P(i+1,mod-2)%mod; } read(x,w); rep(i,1,w)read(a[i],b[i]); ll ans=0; rep(k,0,x) { ll res=C[x+1][k]*B[k]%mod; ll y=x+1-k; rep(i,1,w) res=(P(P(a[i],b[i]),y)-P(a[i],x)*P(P(a[i],b[i]-1),y))%mod*res%mod; ans=(ans+res)%mod; } ans=ans*P(x+1,mod-2)%mod; if(ans<0)ans+=mod; cout<<ans<<endl; scanf(" "); return 0; }
#include<cstdio> #include<cstring> #include<algorithm> #include<set> #include<vector> #include<map> #include<queue> #include<string> #include<bitset> #include<iomanip> #include<iostream> #include<cmath> using namespace std; #define rep(i,x,y) for(i=x;i<=y;i++) #define _rep(i,x,y) for(i=x;i>=y;i--) #define REP(i,x,y) for(int i=(x);i<=(y);i++) #define _REP(i,x,y) for(int i=(x);i>=(y);i--) #define CL(S,x) memset(S,x,sizeof(S)) #define CP(S1,S2) memcpy(S1,S2,sizeof(S2)) #define ALL(x,S) for(x=S.begin();x!=S.end();x++) #define pb push_back #define IN insert //用set写的。。。懒的优化了 #define ER erase #define BE begin() #define ED end() #define LB lower_bound #define UB upper_bound #define mp make_pair #define fi first #define se second #define upmin(x,y) x=min(x,y) #define upmax(x,y) x=max(x,y) #define COUT(S,x) cout<<fixed<<setprecision(x)<<S<<endl template<class T> inline void read(T&x){bool fu=0;char c;for(c=getchar();c<=32;c=getchar());if(c=='-')fu=1,c=getchar();for(x=0;c>32;c=getchar())x=x*10+c-'0';if(fu)x=-x;}; template<class T> inline void read(T&x,T&y){read(x);read(y);} template<class T> inline void read(T&x,T&y,T&z){read(x);read(y);read(z);} inline char getc(){char c;for(c=getchar();c<=32;c=getchar());return c;} typedef long long ll; typedef long double ld; typedef pair<int,int> pii; const int N=100010; const int M=1000010; int T,n,m,i,j,k,l,p,x,y; int sum[M]; int in[N],out[N],at[N];bool ki[N]; vector<pair<int,pii> > V; vector<pair<int,pii> >::iterator pp; void addo(int o,int x,int y){ if(o==0)if(at[x]==y)return; if(o==1)swap(x,y); V.pb(mp(o,mp(x,y))); if(o==0)at[x]=y; } set<int> cur; set<int> I[M],D[M]; set<int>::iterator it; vector<pii> rest; vector<pii>::iterator vit; int main() { //freopen("1.in","r",stdin);freopen("1.out","w",stdout); for(read(T);T;T--) { read(n,m); cur.clear();rest.clear();V.clear();CL(sum,0); rep(i,1,m)I[i].clear(),D[i].clear(); rep(i,1,n) { read(x,y);in[i]=x;out[i]=y;ki[i]=x<y;at[i]=x; if(x<y)sum[x+1]++,sum[y+1]--,I[x].IN(i),D[y].IN(i); else sum[y+1]--,sum[x+1]++,I[y].IN(i),D[x].IN(i); } ll ans=0; rep(i,1,m)sum[i]+=sum[i-1],ans+=abs(sum[i]); printf("%lld ",ans); rep(p,1,m) { ALL(it,D[p])cur.ER(*it); ALL(it,I[p]) { int i=*it; if(cur.empty()){cur.insert(i);continue;} int j=*cur.begin();cur.IN(i); if(ki[i]==ki[j])continue; if(ki[i]==0)swap(i,j); if(in[j]<=out[i]) { addo(0,i,in[j]); addo(1,i,j); cur.ER(i);D[out[i]].ER(i); cur.ER(j);D[in[j]].ER(j); swap(in[i],in[j]); if(in[i]!=out[i]) I[in[i]].IN(i),D[out[i]].IN(i); } else { rest.pb(mp(i,j)); cur.ER(i);D[out[i]].ER(i); cur.ER(j);D[in[j]].ER(j); if(out[i]!=in[j]) I[out[i]].IN(j),D[in[j]].IN(j); } } } reverse(rest.begin(),rest.end()); ALL(vit,rest) { int i=vit->fi,j=vit->se; addo(0,i,out[i]); addo(0,j,out[i]); addo(1,i,j);swap(in[i],in[j]); } rep(i,1,n)addo(0,i,out[i]); printf("%d ",V.size()); ALL(pp,V)printf("%d %d %d ",(*pp).fi,(*pp).se.fi,(*pp).se.se); } return 0; }