原题网址：https://www.luogu.org/problem/lists?name=&orderitem=pid&tag=83%7C33
T1
简单的离线
1 #include<iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<string> 5 #include<cmath> 6 #include<algorithm> 7 using namespace std; 8 int c[2001][2001]={0},f[2001][2001]={0}; 9 inline int read() 10 { 11 char ch=getchar(); 12 int a=0,t=1; 13 while(ch<'0'||ch>'9') {if(ch=='-') t=-1;ch=getchar();} 14 while(ch<='9'&&ch>='0') {a=a*10+ch-'0';ch=getchar();} 15 return a*t; 16 } 17 inline void write(int k){ 18 if (k<0) { 19 putchar('-'); 20 k=-k; 21 } 22 if (k>9) write(k/10); 23 putchar(k%10+'0'); 24 } 25 int main(){ 26 //freopen("problem.in","r",stdin); freopen("problem.out","w",stdout); 27 int t=read(),k=read(); 28 for (int i=0;i<=2000;i++) c[i][0]=1,c[i][1]=i%k; 29 for (int i=2;i<=2000;i++){ 30 for (int j=2;j<=i;j++) 31 c[i][j]=(c[i-1][j]+c[i-1][j-1])%k; 32 } 33 34 /*for (int i=1;i<=5;i++){ 35 for (int j=1;j<=i;j++) 36 printf("%d ",c[i][j]); 37 printf(" "); 38 }*/ 39 40 for (int i=1;i<=2000;i++){ 41 for (int j=1;j<=i;j++){ 42 f[i][j]=0; 43 if (c[i][j]==0) f[i][j]=1; 44 if (i!=j) f[i][j]=f[i][j]+f[i-1][j]+f[i][j-1]-f[i-1][j-1]; 45 else f[i][j]=f[i][j]+f[i][j-1]; 46 } 47 } 48 /*for (int i=1;i<=3;i++){ 49 for (int j=1;j<=i;j++) 50 printf("%d ",f[i][j]); 51 printf(" "); 52 }*/ 53 54 for (int i=1;i<=t;i++){ 55 int n=read(),m=read(); 56 if (n<m) m=n; 57 printf("%d ",f[n][m]); 58 } 59 return 0; 60 }
T2
个人感觉优先队列更优
1 #include <iostream> 2 #include <queue> 3 #include <map> 4 #include <ctime> 5 #include <cmath> 6 #include <cstdlib> 7 #include <cstdio> 8 #include <cstring> 9 #include <string> 10 #include <algorithm> 11 #include <iomanip> 12 #include <bitset> 13 #include <set> 14 using namespace std; 15 #define ll long long 16 #define up(i,j,n) for(int i=j;i<=n;i++) 17 #define down(i,j,n) for(int i=j;i>=n;i--) 18 #define cmax(a,b) a=max(a,b) 19 #define cmin(a,b) a=min(a,b) 20 #define FILE "earthworm" 21 const ll MAXN=1e7+5; 22 const ll oo=1LL<<55; 23 inline ll read(){ 24 char ch=getchar();ll x=0,f=1; 25 while(ch>'9'||ch<'0'){if(ch=='-')f=-1;ch=getchar();} 26 while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();} 27 return x*f; 28 } 29 ll N,M,Q,U,V,T,_old[MAXN],_short[MAXN],_long[MAXN],t1=0,t2=1,t3=1,top2=0,top3=0,cnt=0,delta=0; 30 31 void init(){ 32 N=read();M=read();Q=read();U=read();V=read();T=read(); 33 up(i,1,N)_old[++t1]=read(); 34 sort(_old+1,_old+t1+1); 35 _old[0]=_short[0]=_long[0]=-oo; 36 } 37 void slove(){ 38 while(M--){ 39 ll now=max(_old[t1],max(_short[t2],_long[t3])); 40 if(now==_old[t1])t1--; 41 else if(now==_short[t2])t2++; 42 else if(now==_long[t3])t3++; 43 now+=delta; 44 if(!(++cnt%T))printf("%d ",now); 45 ll __short=now*U/V,__long=now-__short; 46 delta+=Q; 47 _short[++top2]=__short-delta;_long[++top3]=__long-delta; 48 } 49 cnt=0;puts(""); 50 M=t1+top2+top3-t2-t3+2; 51 while(M--){ 52 ll now=max(_old[t1],max(_short[t2],_long[t3])); 53 if(now==_old[t1]&&t1>0)t1--; 54 else if(now==_short[t2]&&t2<=top2)t2++; 55 else if(now==_long[t3]&&t3<=top3)t3++; 56 if(t2>top2)_short[t2]=-oo; 57 if(t3>top3)_long[t3]=-oo; 58 if(!(++cnt%T))printf("%lld ",now+delta); 59 } 60 } 61 int main(){ 62 //freopen(FILE".in","r",stdin); 63 //freopen(FILE".out","w",stdout); 64 init(); 65 slove(); 66 return 0; 67 }
T3
状压DP不解释
1 #include <cmath> 2 #include <cstdio> 3 #include <cstring> 4 #include <iostream> 5 #include <algorithm> 6 using namespace std; 7 int n,l,dp[1<<19],vd[19][19],tp[19]; 8 struct quad 9 { 10 double a,b; 11 quad() {} 12 quad(double _a,double _b): 13 a(_a),b(_b) {} 14 }; 15 double pigx[19],pigy[19]; 16 const double eps=1e-10,INF=1e20; 17 inline quad qd(double x1,double y1,double x2,double y2) 18 { 19 if(abs(x1-x2)<eps) return quad(INF,INF); 20 double a=(y1*x2-x1*y2)/(x1*x1*x2-x2*x2*x1), 21 b=(y1-a*x1*x1)/x1; 22 if(a>eps || abs(a)<eps) return quad(INF,INF); 23 return quad(a,b); 24 } 25 inline void cyx() 26 { 27 int i,j,state;dp[0]=0; 28 for(state=1;state<(1<<n);state++) 29 { 30 int res=n+100;l=0; 31 for(i=1;i<=n;i++) 32 if((state>>i-1)%2==1) 33 tp[++l]=i; 34 for(i=1;i<l;i++) 35 for(j=i+1;j<=l;j++) 36 { 37 if(vd[tp[i]][tp[j]]==-1) continue; 38 res=min(res,dp[state&vd[tp[i]][tp[j]]]+1); 39 } 40 for(i=1;i<=l;i++) 41 res=min(res,dp[state-(1<<tp[i]-1)]+1); 42 dp[state]=res; 43 } 44 } 45 inline void work() 46 { 47 int i,j,k; 48 scanf("%d%*d",&n); 49 memset(dp,-1,sizeof(dp)); 50 for(i=1;i<=n;i++) for(j=1;j<=n;j++) vd[i][j]=(1<<n)-1; 51 for(i=1;i<=n;i++) scanf("%lf%lf",&pigx[i],&pigy[i]); 52 for(i=1;i<n;i++) 53 for(j=i+1;j<=n;j++) 54 { 55 quad x=qd(pigx[i],pigy[i],pigx[j],pigy[j]); 56 if(abs(x.a-INF)>eps && abs(x.b-INF)>eps) 57 for(k=1;k<=n;k++) 58 { 59 if(abs(x.a*pigx[k]*pigx[k] 60 +x.b*pigx[k]-pigy[k])<eps) 61 vd[i][j]-=1<<k-1,vd[j][i]-=1<<k-1; 62 } 63 else vd[i][j]=vd[j][i]=-1; 64 } 65 cyx();printf("%d ",dp[(1<<n)-1]); 66 } 67 int main() 68 { 69 int T; 70 scanf("%d",&T); 71 while(T--) work(); 72 return 0; 73 }