Codeforces Round #438 by Sberbank and Barcelona Bootcamp (Div. 1 + Div. 2 combined) A,B,C【真的菜·】

8说了

 1 #include<bits/stdc++.h>
 2
 3 using namespace std;
 4 #define int long long
 5
 6 signed main(){
 7     string str;
 8     cin>>str;
 9     int _;
10     cin>>_;
11     int flag1=0;
12     int flag2=0;
13     int flag3=0;
14     int flag4=0;
15     while(_--){
16         string s;
17         cin>>s;
18         if(s==str){
19             flag4=1;
20             continue;
21         }
22         if(s[0]==str[1]&&s[1]==str[0]){
23             flag3=1;
24             continue;
25         }
26         if(str[0]==s[1]){
27             flag1=1;
28         }
29         if(str[1]==s[0]){
30             flag2=1;
31         }
32     }
33 //    cout<<flag1<<" "<<flag2<<" "<<flag3<<" "<<flag4; 
34     if(flag3||flag4||(flag1+flag2==2)){
35         printf("YES\n");
36     }else{
37         printf("NO\n");
38     }
39     return 0;
40 }
41 /*
42 ah
43 oy
44
45 aa
46
47 ha
48 yo
49 */

  思路：直接暴力---居然能过.钟表问题转换是真滴难QAQ【小学就没整懂】

 1 #include<bits/stdc++.h>
 2
 3 using namespace std;
 4 #define int long long
 5 int vis[500];
 6 signed main(){
 7     int h,m, s, t1, t2;
 8     cin>>h>>m>>s>>t1>>t2;
 9     h*=5;t1*=5;
10     t2*=5;
11     vis[h]++;
12     vis[m]++;
13     vis[s]++;
14     int ss=0;
15     if(t1>t2)
16         swap(t1,t2);
17     for(int i=t1;i<t2;i++){
18         ss+=vis[i];
19     }
20     if(ss==0||ss==3){
21         cout<<"YES";
22     }
23     else{
24         cout<<"NO";
25     }
26     return 0;
27 }

 题解：二进制+暴力。

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int a[150000];
 4 int vis[150];int n,k;
 5 signed main(){
 6     memset(vis,0,sizeof(vis));
 7     cin>>n>>k;
 8     for(int i=1;i<=n;i++){
 9         for(int j=1;j<=k;j++){
10             scanf("%d",&a[j]);
11         }
12          vis[a[1]+a[2]*2+a[3]*4+a[4]*8]=1;
13     }
14     for(int i=0;i<=(1<<k);i++){
15         for(int j=i;j<=(1<<k);j++){
16             if(vis[i]&&vis[j]&&(!(i&j))){
17                  printf("YES");
18                  return 0;
19             }
20         }
21     }
22     printf("NO");
23     return 0;
24 }