Codeforces Beta Round #77 (Div. 2 Only)

Codeforces Beta Round #77 (Div. 2 Only)

http://codeforces.com/contest/96

A

 #include<bits/stdc++.h>
 using namespace std;
 #define lson l,mid,rt<<1
 #define rson mid+1,r,rt<<1|1
 #define sqr(x) ((x)*(x))
 #define pb push_back
 #define eb emplace_back
 #define maxn 13000005
 #define eps 1e-8
 #define pi acos(-1.0)
 #define rep(k,i,j) for(int k=i;k<j;k++)
 typedef long long ll;
 typedef pair<int,int> pii;
 typedef pair<char,int> pci;
 typedef pair<pair<int,string>,pii> ppp;
 typedef unsigned long long ull;
 const long long MOD=1e9+;
 /*#ifndef ONLINE_JUDGE
         freopen("1.txt","r",stdin);
 #endif */
 
 int main(){
     #ifndef ONLINE_JUDGE
      //   freopen("1.txt","r",stdin);
     #endif
     std::ios::sync_with_stdio(false);
     string str;
     cin>>str;
     int co=;
     vector<int>ve;
     for(int i=;i<str.length();i++){
         if(str[i]!=str[i-]){
             ve.pb(co);
             co=;
         }
         else{
             co++;
         }
     }
     ve.pb(co);
     for(int i=;i<ve.size();i++){
         if(ve[i]>=) {cout<<"YES"<<endl;return ;}
     }
     cout<<"NO"<<endl;
 }

B

dfs+二分

 #include<bits/stdc++.h>
 using namespace std;
 #define lson l,mid,rt<<1
 #define rson mid+1,r,rt<<1|1
 #define sqr(x) ((x)*(x))
 #define pb push_back
 #define eb emplace_back
 #define maxn 13000005
 #define eps 1e-8
 #define pi acos(-1.0)
 #define rep(k,i,j) for(int k=i;k<j;k++)
 typedef long long ll;
 typedef pair<int,int> pii;
 typedef pair<char,int> pci;
 typedef pair<pair<int,string>,pii> ppp;
 typedef unsigned long long ull;
 const long long MOD=1e9+;
 /*#ifndef ONLINE_JUDGE
         freopen("1.txt","r",stdin);
 #endif */
 
 ll n;
 
 set<ll>se;
 map<ll,int>mp;
 
 void Check(ll num){
     ll tmp=num;
     int qi=,si=;
     while(num){
         if(num%==){
             si++;
         }
         else if(num%==){
             qi++;
         }
         num/=;
     }
     if(si==qi&&si>){
         se.insert(tmp);
     }
 }
 
 void dfs(ll num){
     if(num>n*||mp[num]) return;
     mp[num]=;
     Check(num);
     dfs(num*+);
     dfs(num*+);
 }
 
 int main(){
     #ifndef ONLINE_JUDGE
      //   freopen("1.txt","r",stdin);
     #endif
     std::ios::sync_with_stdio(false);
     cin>>n;
     dfs();
     set<ll>::iterator it;
     it=lower_bound(se.begin(),se.end(),n);
     cout<<*it<<endl;
 }

C

模拟

 #include<bits/stdc++.h>
 using namespace std;
 #define lson l,mid,rt<<1
 #define rson mid+1,r,rt<<1|1
 #define sqr(x) ((x)*(x))
 #define pb push_back
 #define eb emplace_back
 #define maxn 13000005
 #define eps 1e-8
 #define pi acos(-1.0)
 #define rep(k,i,j) for(int k=i;k<j;k++)
 typedef long long ll;
 typedef pair<int,int> pii;
 typedef pair<char,int> pci;
 typedef pair<pair<int,string>,pii> ppp;
 typedef unsigned long long ull;
 const long long MOD=1e9+;
 /*#ifndef ONLINE_JUDGE
         freopen("1.txt","r",stdin);
 #endif */
 const int N = ;
 string s[N], ss[N], w, ww;
 bool vis[N];
 char str;
 string change(string x) {
     for(int i = ; i < x.length(); i ++) {
         if(x[i] >= 'A' && x[i] <= 'Z') x[i] += ;
     }
     return x;
 }
 
 int main(){
     #ifndef ONLINE_JUDGE
      //   freopen("1.txt","r",stdin);
     #endif
     std::ios::sync_with_stdio(false);
     int n;
     cin >> n;
     for(int i = ; i < n; i ++) {
         cin >> s[i];
         ss[i] = change(s[i]);
     }
     cin >> w >> str;
     ww = change(w);
     if(str >= 'A' && str <= 'Z') str += ;
 
     int l = ww.length();
     for(int i = ; i < l; i ++) {
         for(int k = ; k < n; k ++) {
             if(l-s[k].length() +  >= i && ww.substr(i, ss[k].length()) == ss[k]) {
                 for(int j = i; j < i + ss[k].length(); j ++) vis[j] = ;
             }
         }
     }
 
     for(int i = ; i < l; i ++) {
         if(vis[i]) {
             if(ww[i] == str) {
                 char tmp = 'a';
                 if(ww[i] == 'a') tmp = 'b';
 
                 if(w[i] >= 'A' && w[i] <= 'Z') w[i] = tmp - ;
                 else w[i] = tmp;
             } else {
                 if(w[i] >= 'A' && w[i] <= 'Z') w[i] = str - ;
                 else w[i] = str;
             }
         }
     }
     cout << w << endl;
 }

D

最短路   两次Dijstra 第一次构建以花费为权值的图，第二次跑最短路

 #include<bits/stdc++.h>
 using namespace std;
 #define lson l,mid,rt<<1
 #define rson mid+1,r,rt<<1|1
 #define sqr(x) ((x)*(x))
 #define pb push_back
 #define eb emplace_back
 #define maxn 13000005
 #define eps 1e-8
 #define pi acos(-1.0)
 #define rep(k,i,j) for(int k=i;k<j;k++)
 typedef long long ll;
 typedef pair<int,int> pii;
 typedef pair<long long,int>pli;
 typedef pair<char,int> pci;
 typedef pair<pair<int,string>,pii> ppp;
 typedef unsigned long long ull;
 const long long MOD=1e9+;
 /*#ifndef ONLINE_JUDGE
         freopen("1.txt","r",stdin);
 #endif */
 
  int n,m,s,t;
 
  vector<pli>G[],ve[];
  vector<pli>a;
 
  long long dis[],vis[];
 
  void dijstra1(int x){
     for(int i=;i<=n;i++) dis[i]=0x3f3f3f3f3f3f3f3f,vis[i]=;
     dis[x]=;
     priority_queue<pli,vector<pli>,greater<pli>>Q;
     Q.push({,x});
     while(!Q.empty()){
         pli p=Q.top();
         Q.pop();
         int v=p.second;
         if(!vis[v]){
             vis[v]=;
             for(int i=;i<G[v].size();i++){
                 int vv=G[v][i].second;
                 long long dist=G[v][i].first+dis[v];
                 if(!vis[vv]&&dist<dis[vv]){
                     dis[vv]=dist;
                     Q.push({dis[vv],vv});
                 }
             }
         }
     }
     for(int i=;i<a.size();i++){
         if(i!=x&&a[x].second>=dis[i]){
             ve[x].pb({a[x].first,i});
         }
     }
  }
 
  void dijstra2(int x,int t){
     for(int i=;i<=n;i++) dis[i]=0x3f3f3f3f3f3f3f3f,vis[i]=;
     dis[x]=;
     priority_queue<pli,vector<pli>,greater<pli>>Q;
     Q.push({,x});
     while(!Q.empty()){
         pli p=Q.top();
         Q.pop();
         int v=p.second;
         if(!vis[v]){
             vis[v]=;
             for(int i=;i<ve[v].size();i++){
                 int vv=ve[v][i].second;
                 long long dist=ve[v][i].first+dis[v];
                 if(!vis[vv]&&dist<dis[vv]){
                     dis[vv]=dist;
                     Q.push({dis[vv],vv});
                 }
             }
         }
     }
     if(dis[t]==0x3f3f3f3f3f3f3f3f) cout<<-<<endl;
     else cout<<dis[t]<<endl;
  }
 
 int main(){
     #ifndef ONLINE_JUDGE
      //   freopen("1.txt","r",stdin);
     #endif
     std::ios::sync_with_stdio(false);
     cin>>n>>m>>s>>t;
     int u,v;
     long long c;
     for(int i=;i<=m;i++){
         cin>>u>>v>>c;
         G[u].pb({c,v});
         G[v].pb({c,u});
     }
     a.pb({,});
     for(int i=;i<=n;i++){
         cin>>u>>c;
         a.pb({c,u});
     }
     for(int i=;i<=n;i++){
         dijstra1(i);
     }
     dijstra2(s,t);
 }

E

大数+数位DP

 #include<bits/stdc++.h>
 using namespace std;
 #define lson l,mid,rt<<1
 #define rson mid+1,r,rt<<1|1
 #define sqr(x) ((x)*(x))
 #define pb push_back
 #define eb emplace_back
 #define maxn 13000005
 #define eps 1e-8
 #define pi acos(-1.0)
 #define rep(k,i,j) for(int k=i;k<j;k++)
 typedef long long ll;
 typedef pair<int,int> pii;
 typedef pair<long long,int>pli;
 typedef pair<char,int> pci;
 typedef pair<pair<int,string>,pii> ppp;
 typedef unsigned long long ull;
 const long long mod=1e9+;
 /*#ifndef ONLINE_JUDGE
         freopen("1.txt","r",stdin);
 #endif */
 const int N=;
 int digit[N];
 ll dp[N][N][];
 char l[N], r[N];
 int k;
 int dfs(int len, int p, bool flag, bool limit) {
     if (len == ) return flag;
     if (limit ==  && dp[len][p][flag] != -) return dp[len][p][flag];
     int up = limit ? digit[len] : ;
     int res = ;
     rep(i, , up + ) {
         if (i !=  && i != )
             res = (res + dfs(len - , max(, p - ), flag, limit && i == up)) % mod;
         else res = (res + dfs(len - ,  * k, flag || p, limit && i == up)) % mod;
     }
     if (!limit) dp[len][p][flag] = res;
     return res;
 }
 void solve() {
     int t;
     memset(dp, -, sizeof dp);
     scanf("%d%d", &t, &k);
     while (t--) {
         scanf("%s%s", l, r);
         int len = strlen(r);
         for(int i=len;i>=;i--) digit[i] = r[len - i] - '';
         int ans = dfs(len, , , );
         len = strlen(l);
         for(int i=len;i>=;i--) digit[i] = l[len - i] - '';
         digit[]--;
         for (int i = ; digit[i] < ; i++) {
             digit[i] += ;
             digit[i + ]--;
         }
         if (digit[len] == ) len--;
         ans = (ans - dfs(len, , , ) + mod) % mod;
         printf("%d\n", ans);
     }
 }
 
 int main(){
     #ifndef ONLINE_JUDGE
      //   freopen("1.txt","r",stdin);
     #endif
     std::ios::sync_with_stdio(false);
     solve();
 }