洛谷 八连测 R4

T1

按题意判断，每次直接输出即可。(莫名输入AFO)

#include <stdio.h>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <queue>
#include <vector>
using namespace std;
int main()
{
  char c=getchar();int f=1;
  while(c!='\n')
  {
      if((c>='a'&&c<='z')&&f)c-=32,f=0;
      else if(c>='A'&&c<='Z'&&f)f=0;
      else if((c>='A'&&c<='Z')&&!f)c+=32;
    printf("%c",c); 
    if(c=='.')f=1;
    c=getchar();
  }
  return 0;
}

T2

链表

#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <memory.h>

using namespace std;
const int maxn = 100005;

int pos[maxn],n,a[maxn];
namespace ST {
    #define ls rt<<1
    #define rs rt<<1|1
    int mx[maxn<<2];
    void build(int rt,int L,int R) {
        if (L>=R) {
            mx[rt]=a[L];return ;
        }
        int mid=L+R>>1;
        build(ls,L,mid);
        build(rs,mid+1,R);
        mx[rt]=max(mx[ls],mx[rs]);
    }
    void assign0(int rt,int L,int R,int p) {
        if (L>=R) {
            mx[rt]=0;return ;
        }
        int mid=L+R>>1;
        if (p<=mid) assign0(ls,L,mid,p);
        else assign0(rs,mid+1,R,p);
        mx[rt]=max(mx[ls],mx[rs]);
    }
    int findl(int rt,int L,int R,int l) {
        if (!mx[rt]) return 0;
        if (l>R) return 0;
        if (L>=R) return L;
        int mid=L+R>>1,res;
        if (l<=mid&&(res=findl(ls,L,mid,l))) return res;
        return findl(rs,mid+1,R,l);
    }
    int findmx(int rt,int L,int R,int l,int r) {
        if (L>=l&&R<=r) return mx[rt];
        int mid=L+R>>1,res=0;
        if (l<=mid) res=max(res,findmx(ls,L,mid,l,r));
        if (r>mid) res=max(res,findmx(rs,mid+1,R,l,r));
        return res;
    }
}
using namespace ST;

int main()
{
    #ifndef ONLINE_JUDGE
        freopen("wa.in","r",stdin);
        freopen("wa.out","w",stdout);
    #endif
    scanf("%d",&n);
    for (int i=1;i<=n;i++)
        scanf("%d",&a[i]),pos[a[i]]=i;
    build(1,1,n);
    for (int i=1;i<=n>>1;i++)
    {
        int p=pos[mx[1]],q=findl(1,1,n,p+1);
        if (!q) p=pos[findmx(1,1,n,1,p-1)],q=findl(1,1,n,p+1);
        assign0(1,1,n,p);assign0(1,1,n,q);
        printf("%d %d ",a[p],a[q]);
    }
    return 0;
}

T3

暴力dfs(???!!!)

#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <memory.h>
#include <string.h>

using namespace std;

const int maxn = 15;
const int inf = 1<<20;

int a[maxn][maxn],ans,n,m,d[maxn],c[maxn][3];
int check(int o) {
    return o<=12&&(o%3==0?1:0);
}
void dfs(int stp) {
    if (stp>n) {
        int res=0;
        for (int j=1;j<=m;j++)
        {
            c[j][1]=c[j][2]=c[j][0]=0;
            for (int i=1;i<=n;i++)
            for (int k=0;k<=2;k++)
                c[j][k]+=check(d[i]+a[i][j]+k);
            res+=max(max(c[j][0],c[j][1]),c[j][2]);
        }
        ans=max(ans,res);
        return ;
    }
    for (int i=0;i<=2;i++)
        d[stp]=i,dfs(stp+1);
}
int main()
{
    #ifndef ONLINE_JUDGE
        freopen("haji.in","r",stdin);
        freopen("haji.out","w",stdout);
    #endif
    scanf("%d %d",&n,&m);
    for (int i=1;i<=n;i++)
    for (int j=1;j<=m;j++)
        scanf("%d",&a[i][j]);
    dfs(1);printf("%d",ans);
    return 0;
}