Problem A?Oshino Shinobu loves Mr.Donut

https://ac.nowcoder.com/acm/contest/908/A

題意：

題解：

C++版本一

?

Problem B?Kuangyeye's Resistance

https://ac.nowcoder.com/acm/contest/908/B

題意：計算n級網絡的等效電阻。

題解：

C++版本一

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; ll t,n,m,k,p,l,r,u,v; int ans,cnt,flag,temp,sum; int a[N]; char str; struct node{}; ll POW(ll a,ll b=p-2,ll c=p){ll res=1;ll base=a%c;while(b){if(b&1)res=(res*base)%p;base=(base*base)%p;b>>=1;}return res; } int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%lld%lld%lld",&n,&r,&p);ll R=r;for(int i=2;i<=n;i++){R=(((R+2*r)%p*r%p)*((POW(R+3*r,p-2,p))%p))%p;}cout<<R<<endl;//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

Problem C?One Piece

https://ac.nowcoder.com/acm/contest/908/C

題意：二進制表示中找到1的數。

題解：__builtin_popcount

C++版本一

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; int ans,cnt,flag,temp,sum; int a[N]; char str; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);scanf("%d",&t);while(t--){scanf("%d",&n);printf("%d\n",__builtin_popcount(n));}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

Problem D?Kth height

https://ac.nowcoder.com/acm/contest/908/D

題意：兩只球隊，都是n個人且都身高遞增，m次操作，將p隊的第q個人的身高變為t，并詢問兩只球隊總集合中第k矮的那個人的身高，保證修改之后依然遞增

題解：二分

C++版本一

題解：二分

1、二分出前k個人，在第一隊里面有多少個；

2、注意多組數據；

3、二分范圍[0,k];

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v,q; int ans,cnt,flag,temp,sum; int a[3][N]; char str; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){while(~scanf("%d",&n)){for(int i=1;i<=n;i++)scanf("%d",&a[1][i]);for(int i=1;i<=n;i++)scanf("%d",&a[2][i]);scanf("%d",&m);for(int i=1;i<=m;i++){scanf("%d%d%d%d",&p,&q,&t,&k);a[p][q]=t;l=0;r=k;while(l<=r){int mid=(l+r)>>1;int temp=(upper_bound(a[2]+1,a[2]+n+1,a[1][mid])-a[2])-1;if(mid+temp<=k){ans=mid;l=mid+1;}else{r=mid-1;}}cout<<max(a[1][ans],a[2][k-ans])<<endl;}}//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

Problem E?Just calculat

https://ac.nowcoder.com/acm/contest/908/E

題意：

題解：

C++版本一

?

Problem F?Cards with Numbers

https://ac.nowcoder.com/acm/contest/908/F

題意：

兩個操作：

• 0 x（? 表示在包裝盒中放入帶有數字x的卡片。）
• 1 x（? 表示查詢在包裝盒中是否有號碼為x的卡片。）

題解：

1、字典樹

2、離散化+離線處理

C++版本一

題解：字典樹

注意：數據原因可能還沒最糟糕的情況所以卡過

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=2500000+10; const int M=1000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v,op; int ans,cnt,flag,temp; int a[N][10]; int en[N]; char x[20]; void insert(char *s){int len=strlen(s),p=0;for(int i=0;i<len;i++){int ch=s[i]-'0';if(a[p][ch]==-1)a[p][ch]=++cnt;p=a[p][ch];}en[p]=1; } bool search(char* s){int len=strlen(s),p=0;for(int i=0;i<len;i++){int ch=s[i]-'0';if(a[p][ch]==-1)return 0;p=a[p][ch];}return en[p]; } int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d",&n);memset(a,-1,sizeof(a));for(int i=1;i<=n;i++){scanf("%d%s",&op,x);if(!op){insert(x);}else{cout<<(search(x)?"yes":"no")<<endl;}}//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

C++版本二

題解：?離散化+離線處理

Problem G?Longest Palindrome Substring

https://ac.nowcoder.com/acm/contest/908/G

題意：最長的回文子串的長度是否大于1

題解：枚舉

C++版本一

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; int ans,cnt,flag,temp,sum; int a[N]; char str[N]; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d",&n);cin>>str;for(int i=1;i<n-1;i++){if(str[i-1]==str[i+1]||str[i-1]==str[i]||str[i]==str[i+1]){ans=1;break;}}cout<<(ans||(n==2&&str[0]==str[1])?"YES":"NO")<<endl;//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

Problem H?Longest Common Palindrome Substring

https://ac.nowcoder.com/acm/contest/908/H

題意：

題解：

C++版本一

?

Problem I?Algorithm Choosing Mushrooms

https://ac.nowcoder.com/acm/contest/908/I

題意：給你n個籃子以及籃子里有的蘑菇，你可以取走一段連續的籃子，但這些籃子里的蘑菇總和必須是m的倍數，問你最多拿幾只籃子？最多拿多少蘑菇？

題解：DP

C++版本一

題解：DP

1、記錄每個余數第一次出現的位置；

2、余數再次出現，則以當前數為結尾的最長區間【第一次位置，當前位置】；

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=200000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; ll ans,cnt,flag,temp,sum; ll a[N]; ll b[N]; char str; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d%d",&n,&m);for(int i=1;i<=n;i++){scanf("%lld",&a[i]);a[i]+=a[i-1];temp=a[i]%m;if(b[temp]==0)b[temp]=i;if((a[i]-a[b[temp]])%m==0){ans=max(ans,i-b[temp]);sum=max(sum,a[i]-a[b[temp]]);}}cout<<sum<<" "<<ans<<endl;//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

Problem J?Simple Problem

https://ac.nowcoder.com/acm/contest/908/J

題意：

題解：

C++版本一

?

Problem K?Water Problem

https://ac.nowcoder.com/acm/contest/908/K

題意：

題解：

C++版本一

?

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