Codeforces Round #640 (Div. 4)

A

简单模拟

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 int a[17];
 5 int b[17];
 6 int main(){
 7     ios::sync_with_stdio(false);
 8     cin.tie(NULL);
 9     cout.tie(NULL);
10     int t;
11     cin>>t;
12     while(t--){
13         int n;
14         cin>>n;
15         int cnt=0;
16         int num=0;
17         while(n){
18             ++num;
19             if(n%10==0){
20                 n/=10;
21                 continue;
22             }
23             a[++cnt]=n%10;
24             b[cnt]=num;
25             n/=10;
26         }
27         cout<<cnt<<"\n";
28         for(int i=1;i<=cnt;++i){
29             cout<<a[i];
30             int x=b[i]-1;
31             while(x--)
32                 cout<<0;
33             cout<<" ";
34         }
35         cout<<"\n";
36     }
37     return 0;
38 }

B

简单枚举

 

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 int main(){
 5     ios::sync_with_stdio(false);
 6     cin.tie(NULL);
 7     cout.tie(NULL);
 8     int t;
 9     cin>>t;
10     while(t--){
11         int n,k;
12         cin>>n>>k;
13         int flag=0;
14         if(n>=2*k){
15             int x=n-2*(k-1);
16             if(x%2==0){
17                 flag=1;
18                 cout<<"YES\n";
19                 for(int i=1;i<k;++i)
20                     cout<<"2 ";
21                 cout<<x<<"\n";
22             }
23         }
24         if(!flag&&n>=k){
25             int x=n-(k-1);
26             if(x&1){
27                 flag=1;
28                 cout<<"YES\n";
29                 for(int i=1;i<k;++i)
30                     cout<<"1 ";
31                 cout<<x<<"\n";
32             }
33         }
34         if(flag==0)
35             cout<<"NO\n";
36     }
37     return 0;
38 }

 

C

简单计数

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 int main(){
 5     ios::sync_with_stdio(false);
 6     cin.tie(NULL);
 7     cout.tie(NULL);
 8     int t;
 9     cin>>t;
10     while(t--){
11         long long n,k;
12         cin>>n>>k;
13         long long x=n-1;
14         long long y=k/x;
15         long long ans=y*n;
16         long long z=k%x;
17         if(z==0)
18             --ans;
19         else
20             ans+=z;
21         cout<<ans<<"\n";
22     }
23     return 0;
24 }

D

简单模拟

 

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 int a[1007];
 5 int main(){
 6     ios::sync_with_stdio(false);
 7     cin.tie(NULL);
 8     cout.tie(NULL);
 9     int t;
10     cin>>t;
11     while(t--){
12         int n;
13         cin>>n;
14         for(int i=1;i<=n;++i)
15             cin>>a[i];
16         int cnt=0;
17         int l=1,r=n;
18         int sum1=0,sum2=0;
19         int ans1=0,ans2=0;
20         while(1){
21             if(l>r)
22                 break;
23             if(cnt%2==0){
24                 ++cnt;
25                 int x=0;
26                 while(l<=r){
27                     x+=a[l++];
28                     if(x>sum2)
29                         break;
30                 }
31                 ans1+=x;
32                 if(x<=sum2)
33                     break;
34                 else
35                     sum1=x;
36             }
37             else{
38                 ++cnt;
39                 int x=0;
40                 while(r>=l){
41                     x+=a[r--];
42                     if(x>sum1)
43                         break;
44                 }
45                 ans2+=x;
46                 if(x<=sum1)
47                     break;
48                 else
49                     sum2=x;
50             }
51         }
52         cout<<cnt<<" "<<ans1<<" "<<ans2<<"\n";
53     }
54     return 0;
55 }

 

E

简单枚举

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 int a[8007];
 5 int vis[8007];
 6 int main(){
 7     ios::sync_with_stdio(false);
 8     cin.tie(NULL);
 9     cout.tie(NULL);
10     int t;
11     cin>>t;
12     while(t--){
13         int n;
14         cin>>n;
15         for(int i=1;i<=n;++i){
16             cin>>a[i];
17             vis[i]=0;
18         }
19         if(n==1){
20             cout<<"0\n";
21             continue;
22         }
23         for(int i=1;i<n;++i){
24             int sum=a[i];
25             for(int j=i+1;j<=n;++j){
26                 sum+=a[j];
27                 if(sum>n)
28                     break;
29                 vis[sum]=1;
30             }
31         }
32         int cnt=0;
33         for(int i=1;i<=n;++i)
34             if(vis[a[i]])
35                 ++cnt;
36         cout<<cnt<<"\n";
37     }
38     return 0;
39 }

F

简单构造

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 char ans[1007];
 5 int main(){
 6     ios::sync_with_stdio(false);
 7     cin.tie(NULL);
 8     cout.tie(NULL);
 9     int t;
10     cin>>t;
11     while(t--){
12         int a,b,c;
13         cin>>a>>b>>c;
14         if(b==0){
15             while(a){
16                 cout<<'0';
17                 --a;
18                 if(a==0)
19                     cout<<'0';
20             }
21             while(c){
22                 cout<<'1';
23                 --c;
24                 if(c==0)
25                     cout<<'1';
26             }
27             cout<<"\n";
28             continue;
29         }
30         int cnt=0;
31         ans[++cnt]='0';
32         while(b>1){
33             ans[++cnt]='1';
34             ans[++cnt]='0';
35             b-=2;
36         }
37         if(b>0)
38             ans[++cnt]='1';
39         while(a){
40             cout<<'0';
41             --a;
42         }
43         cout<<ans[1];
44         while(c){
45             cout<<'1';
46             --c;
47         }
48         for(int i=2;i<=cnt;++i)
49             cout<<ans[i];
50         cout<<"\n";
51     }
52     return 0;
53 }

G

简单构造

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 int main(){
 5     ios::sync_with_stdio(false);
 6     cin.tie(NULL);
 7     cout.tie(NULL);
 8     int t;
 9     cin>>t;
10     while(t--){
11         int n;
12         cin>>n;
13         if(n<4)
14             cout<<"-1\n";
15         else if(n%4==0||n%4==1){
16             int x=n/4;
17             int y=n%4;
18             for(int i=1;i<=x;++i)
19                 cout<<4*(i-1)+2<<" "<<4*(i-1)+4<<" "<<4*(i-1)+1<<" "<<4*(i-1)+3<<" ";
20             if(y>0)
21                 cout<<n;
22             cout<<"\n";
23         }
24         else if(n%4==2){
25             int x=n/4;
26             cout<<"1 3 5 2 6 4 ";
27             for(int i=2;i<=x;++i)
28                 cout<<4*(i-1)+4<<" "<<4*(i-1)+6<<" "<<4*(i-1)+3<<" "<<4*(i-1)+5<<" ";
29             cout<<"\n";
30         }
31         else if(n%4==3){
32             int x=n/4;
33             cout<<"2 6 4 1 3 7 5 ";
34             for(int i=2;i<=x;++i)
35                 cout<<4*(i-1)+5<<" "<<4*(i-1)+7<<" "<<4*(i-1)+4<<" "<<4*(i-1)+6<<" ";
36             cout<<"\n";
37         }
38     }
39     return 0;
40 }

 

posted @ 2020-05-10 23:05  sewage  阅读(140)  评论(0)  编辑  收藏  举报