kuangbin專題題目一
本文是kuangbin專題的簡單搜索題解，題解可能寫的不是很清晰，不過不重要，代碼還是很容易理解的。
做題順序
7 11 2 12 3 1 8 13 6 14 10 9 5 4
附上題目鏈接
kuangbin專題鏈接
這里先擺了第七題

7 Shuffle’m Up

#include<iostream> #include<cstring> #include<queue> #include<string> #include<map> #define MAX 300 using namespace std; int n; string s,s1,s2,s3,str; int flag; int sum; map<string,int>mp; void dfs() {sum++;str="";for(int i=0;i<n;i++){str+=s2[i];str+=s1[i];}if(str==s){flag=1;return ;}if(mp[str]!=0){flag=-1;return ;}mp[str]++;for(int i=0;i<2*n;i++){if(i<n)s1[i]=str[i];elses2[i-n]=str[i];}dfs();return ; } int main() {int t;cin>>t;for(int p=1;p<=t;p++){flag=0;cin>>n;cin>>s1>>s2;s3+=s1;s3+=s2;mp[s3]++;cin>>s;sum=0;dfs();cout<<p<<" ";if(flag==1)cout<<sum<<endl;elsecout<<"-1"<<endl;} }

11 迷宮問題

#include<iostream> #define MAX 105 using namespace std; struct node{int x;int y;int pre; }fp[MAX]; int dir[4][2]={{1,0},{-1,0},{0,1},{0,-1}}; int g[MAX][MAX]; int a[MAX][MAX]; int m=0; int pos=0; void bfs() {fp[0].x=0;fp[0].y=0;fp[0].pre=-1;m++;g[0][0]=1;while(m>pos){for(int i=0;i<4;i++){int xi=fp[pos].x+dir[i][0];int yi=fp[pos].y+dir[i][1];if(xi>5||xi<0||yi>5||yi<0||g[xi][yi]==1||a[xi][yi]==1)continue;fp[m].x=xi;fp[m].y=yi;fp[m].pre=pos;m++;g[xi][yi]=1;if(xi==4&&yi==4)return ;}pos++;} } void dfs(node now) {if(now.pre==-1)cout<<"("<<now.x<<", "<<now.y<<")"<<endl;else{dfs(fp[now.pre]);cout<<"("<<now.x<<", "<<now.y<<")"<<endl;}return ; } int main() {for(int i=0;i<5;i++)for(int j=0;j<5;j++)cin>>a[i][j];bfs();dfs(fp[m-1]); }

2 Dungeon Master

#include<iostream> #include<queue> #include<cstring> #define MAX 105 using namespace std; struct node{int x;int y;int z;int pre; }fp; int H,X,Y; int dir[6][3]={{1,0,0},{-1,0,0},{0,1,0},{0,-1,0},{0,0,1},{0,0,-1}}; int g[MAX][MAX][MAX]; char a[MAX][MAX][MAX]; int m=0; int pos=0; int bfs() {queue<node>q;q.push(fp);while(!q.empty()){node t=q.front();q.pop();for(int i=0;i<6;i++){int xi=t.x+dir[i][0];int yi=t.y+dir[i][1];int zi=t.z+dir[i][2];int step=t.pre+1;if(xi>X-1||xi<0||yi>Y-1||yi<0||zi>H-1||zi<0||g[xi][yi][zi]==1||a[xi][yi][zi]=='#')continue;node r={xi,yi,zi,step};q.push(r);g[xi][yi][zi]=1;if(a[xi][yi][zi]=='E')return step;}}return -1; }int main() {while(cin>>H>>X>>Y){memset(g,0,sizeof g);if(H==0&&X==0&&Y==0)break;for(int i=0;i<H;i++)for(int j=0;j<X;j++)for(int k=0;k<Y;k++){cin>>a[j][k][i];if(a[j][k][i]=='S'){fp={j,k,i,0};g[j][k][i]=1;}}int p=bfs();if(p==-1)cout<<"Trapped!"<<endl;elsecout<<"Escaped in "<<p<<" minute(s)."<<endl;} }

12 Oil Deposits

#include<iostream> #include<queue> #include<cstring> #define MAX 105 using namespace std; struct node{int x;int y; }; int N,M; char ch[MAX][MAX]; int g[MAX][MAX]; int dis[8][2]={{1,0},{-1,0},{0,1},{0,-1},{-1,-1},{1,-1},{-1,1},{1,1}}; int bfs() {int ans=0;queue<node>q;for(int i=0;i<N;i++){for(int j=0;j<M;j++){if(ch[i][j]=='@'&&g[i][j]==0){g[i][j]=1;node f{i,j};q.push(f);ans++;while(!q.empty()){node r=q.front();q.pop();for(int i=0;i<8;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(xi<0||xi>=N||yi<0||yi>=M||g[xi][yi]==1||ch[xi][yi]!='@')continue;g[xi][yi]=1;node f{xi,yi};q.push(f);}}}}}return ans; } int main() {while(cin>>N>>M){if(M==0)break;for(int i=0;i<N;i++)for(int j=0;j<M;j++)cin>>ch[i][j];memset(g,0,sizeof g);cout<<bfs()<<endl;} }

3 Catch That Cow

#include<iostream> #include<queue> #include<cstring> using namespace std; int n,m; int f[1000005]; int mmin=99999999; int bfs() {pair<int,int>p;queue<pair<int,int> >q;p.first=n;p.second=0;q.push(p);memset(f,0,sizeof f);f[n]=1;while(!q.empty()){pair<int,int>a;a=q.front();q.pop();if(a.first==m)return a.second;if(a.first+1<=m&&f[a.first+1]==0){pair<int,int>t;t=a;t.first++;t.second++;if(t.first==m)return t.second;q.push(t);f[t.first]=1;//cout<<t.first<<endl;}if(a.first-1>=0&&f[a.first-1]==0){pair<int,int>t;t=a;t.first--;t.second++;if(t.first==m)return t.second;q.push(t);f[t.first]=1;//cout<<t.first<<endl;}if(a.first>0&&f[a.first*2]==0&&a.first*2<=200000){pair<int,int>t;t=a;t.first*=2;t.second++;if(t.first==m)return t.second;q.push(t);f[t.first]=1;//cout<<t.first<<endl;}} } int main() {cin>>n>>m;int f=bfs();cout<<f<<endl; }

1 棋盤問題

#include<iostream> #include<cstring> using namespace std; char ch[10][10]; int f[10]; int n,m; int ans=0; void dfs(int x,int m) {if(x>=n){if(m==0) ans++;return ;}for(int i=0;i<n;i++){if(ch[x][i]=='#'&&!f[i]){f[i]=1;dfs(x+1,m-1);f[i]=0;}}dfs(x+1,m); } int main() {while(cin>>n>>m){if(n==-1&&m==-1)return 0;memset(f,0,sizeof(f));ans=0;for(int i=0;i<n;i++){for(int j=0;j<n;j++)cin>>ch[i][j];}dfs(0,m);cout<<ans<<endl;} }

8 Post

#include<iostream> #include<queue> #include<cstring> #define MAX 1005 using namespace std; int a,b,c; int filla=1,fillb=2,dropa=3,dropb=4,pourab=5,pourba=6; int num=0; int abf[MAX][MAX]; int flag=0; string str[]={"FILL(1)","FILL(2)","DROP(1)","DROP(2)","POUR(1,2)","POUR(2,1)"}; struct node{int a1;int b1;string s; }; void bfs() {queue<node>q;q.push(node{a,0,"0"});abf[a][0]=1;q.push(node{0,b,"1"});abf[0][b]=1;while(!q.empty()){node r=q.front();q.pop();if(r.a1==c||r.b1==c){flag=1;cout<<(r.s).size()<<" "<<endl;//cout<<r.a1<<" "<<r.b1<<endl;for(int i=0;i<(r.s).size();i++){if(i<(r.s).size()-1)cout<<str[(r.s)[i]-'0']<<" "<<endl;elsecout<<str[(r.s)[i]-'0']<<endl;}return ;}node f;f={a,r.b1,r.s+"0"};if(!abf[f.a1][f.b1]){q.push(f);abf[f.a1][f.b1]=1;}f={r.a1,b,r.s+"1"};if(!abf[f.a1][f.b1]){q.push(f);abf[f.a1][f.b1]=1;}f={0,r.b1,r.s+"2"};if(!abf[f.a1][f.b1]){q.push(f);abf[f.a1][f.b1]=1;}f={r.a1,0,r.s+"3"};if(!abf[f.a1][f.b1]){q.push(f);abf[f.a1][f.b1]=1;}if(r.a1>b-r.b1)f={r.a1-(b-r.b1),b,r.s+"4"};elsef={0,r.b1+r.a1,r.s+"4"};if(!abf[f.a1][f.b1]){q.push(f);abf[f.a1][f.b1]=1;}if(r.b1>a-r.a1)f={a,r.b1-(a-r.a1),r.s+"5"};elsef={r.a1+r.b1,0,r.s+"5"};if(!abf[f.a1][f.b1]){q.push(f);abf[f.a1][f.b1]=1;}} } int main() {cin>>a>>b>>c;memset(abf,0,sizeof abf);bfs();if(!flag)cout<<"impossible"<<endl; }

13 非常可樂

#include<iostream> #include<queue> #include<cstring> #define MAX 105 using namespace std; struct node{int s;int n;int m;int ans; }; int fp[MAX][MAX][MAX]; int S,N,M; int flag=0; int bfs() {queue<node>q;node t={S,0,0,0};fp[S][0][0]=1;q.push(t);while(!q.empty()){node r;r=q.front();q.pop();if((r.s==r.m&&r.s+r.m==S)||(r.s==r.n&&r.s+r.n==S)||(r.n==r.m&&r.n+r.m==S)){flag=1;cout<<r.ans<<endl;return 0;}for(int i=0;i<6;i++){int xs,xn,xm,xans;xs=r.s;xn=r.n;xm=r.m;xans=r.ans+1;if(i==0){int temp;temp=min(r.s,N-r.n);xs-=temp;xn+=temp;}if(i==1){int temp;temp=min(r.s,M-r.m);xs-=temp;xm+=temp;}if(i==2){int temp;temp=min(r.n,S-r.s);xn-=temp;xs+=temp;}if(i==3){int temp;temp=min(r.n,M-r.m);xn-=temp;xm+=temp;}if(i==4){int temp;temp=min(r.m,N-r.n);xm-=temp;xn+=temp;}if(i==5){int temp;temp=min(r.m,S-r.s);xm-=temp;xs+=temp;}node f={xs,xn,xm,xans};if(!fp[f.s][f.n][f.m]){q.push(f);fp[f.s][f.n][f.m]=1;}}}cout<<"NO"<<endl; } int main() {while(cin>>S>>N>>M){if(S==0&&N==0&&M==0)break;memset(fp,0,sizeof fp);if(S%2){cout<<"NO"<<endl;continue;}bfs();} }

6 Prime Path

#include<iostream> #include<cstring> #include<queue> #include<map> #define MAX 10005 using namespace std; struct node{int key;int ans; }; int N,M; int f[MAX]; int _ok(int fp) {for(int i=2;i*i<=fp;i++){if(fp%i==0)return 0;}return 1; } void bfs() {queue<node>q;node t={N,0};f[N]=1;q.push(t);while(!q.empty()){node r=q.front();q.pop();//cout<<r.key<<endl;if(r.key==M){cout<<r.ans<<endl;return ;}for(int i=0;i<4;i++){if(i==0){int g=r.key/10*10;for(int i=0;i<=9;i++){if(g+i<=9999&&_ok(g+i)==1&&f[g+i]==0){node fp={g+i,r.ans+1};q.push(fp);f[g+i]=1;}}}if(i==1){int a=r.key%10;int g=r.key/100*100;for(int i=0;i<=9;i++){if(g+i*10+a<=9999&&_ok(g+i*10+a)==1&&f[g+i*10+a]==0){node fp={g+i*10+a,r.ans+1};q.push(fp);f[g+i*10+a]=1;}}}if(i==2){int a=r.key%100;int g=r.key/1000*1000;for(int i=0;i<=9;i++){if(g+i*100+a<=9999&&_ok(g+i*100+a)==1&&f[g+i*100+a]==0){node fp={g+i*100+a,r.ans+1};q.push(fp);f[g+i*100+a]=1;}}}if(i==3){int a=r.key%1000;for(int i=1;i<=9;i++){if(i*1000+a<=9999&&_ok(i*1000+a)==1&&f[i*1000+a]==0){node fp={i*1000+a,r.ans+1};q.push(fp);f[i*1000+a]=1;}}}}}cout<<"0"<<endl; } int main() {int T;cin>>T;while(T--){cin>>N>>M;memset(f,0,sizeof f);bfs();} }

14 Find a way

#include<iostream> #include<queue> #include<cstring> #define MAX 305 using namespace std; struct node {int x;int y;int ans; }; int N,M; int fy[MAX][MAX]; int fm[MAX][MAX]; int px[MAX][MAX]; int x1,y1,x2,y2; char ch[MAX][MAX]; int dis[4][2]={{1,0},{-1,0},{0,1},{0,-1}}; void bfs() {queue<node>q;node t={x1,y1,0};fy[x1][y1]=-1;q.push(t);while(!q.empty()){node r=q.front();q.pop();if(ch[r.x][r.y]=='@'){px[r.x][r.y]+=r.ans;}for(int i=0;i<4;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(xi>=N||xi<0||yi>=M||yi<0||fy[xi][yi]!=0||ch[xi][yi]=='#')continue;node f={xi,yi,r.ans+1};q.push(f);fy[xi][yi]=-1;}}t={x2,y2,0};q.push(t);fm[x2][y2]=1;while(!q.empty()){node r=q.front();q.pop();if(ch[r.x][r.y]=='@'){px[r.x][r.y]+=r.ans;}for(int i=0;i<4;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(xi>=N||xi<0||yi>=M||yi<0||fm[xi][yi]==1||ch[xi][yi]=='#')continue;node f={xi,yi,r.ans+1};q.push(f);fm[xi][yi]=1;}}return ; } int main() {while(cin>>N>>M){for(int i=0;i<N;i++){for(int j=0;j<M;j++){cin>>ch[i][j];if(ch[i][j]=='Y')x1=i,y1=j;if(ch[i][j]=='M')x2=i,y2=j;}}memset(fy,0,sizeof fy);memset(fm,0,sizeof fm);memset(px,0,sizeof px);bfs();int mmax=500;for(int i=0;i<N;i++){for(int j=0;j<M;j++){//cout<<px[i][j]<<" ";if(px[i][j]>0)mmax=min(mmax,px[i][j]);}//cout<<endl;}cout<<mmax*11<<endl;} }

10 Fire！

#include<bits/stdc++.h> #include<queue> #include<cstring> #define MAX 3005 using namespace std; struct node{int x;int y;int ans; }; int N,M; int fF[MAX][MAX]; int fJ[MAX][MAX]; char ch[MAX][MAX]; int xj,yj,xf,yf; int dis[4][2]={{1,0},{-1,0},{0,1},{0,-1}}; queue<node>q; void bfs() {while(!q.empty()){node r=q.front();q.pop();for(int i=0;i<4;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(xi<N&&xi>=0&&yi<M&&yi>=0&&ch[xi][yi]!='#'&&fF[xi][yi]==-1){node f={xi,yi,r.ans+1};q.push(f);fF[xi][yi]=r.ans+1;}}}node t={xj,yj,0};q.push(t);fJ[xj][yj]=1;while(!q.empty()){node r=q.front();q.pop();if(r.x==N-1||r.x==0||r.y==M-1||r.y==0){cout<<r.ans+1<<endl;return ;}for(int i=0;i<4;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(ch[xi][yi]!='#'&&fJ[xi][yi]==0&&(r.ans+1<fF[xi][yi]||fF[xi][yi]==-1)){node f={xi,yi,r.ans+1};//cout<<xi<<" "<<yi<<endl;q.push(f);fJ[xi][yi]=1;}}}cout<<"IMPOSSIBLE"<<endl;return ; } void bfs1() {while(!q.empty()){node r=q.front();q.pop();for(int i=0;i<4;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(xi<N&&xi>=0&&yi<M&&yi>=0&&ch[xi][yi]!='#'&&fF[xi][yi]==-1){node f={xi,yi,r.ans+1};q.push(f);fF[xi][yi]=r.ans+1;}}} } void bfs2() {node m={xj,yj,0};q.push(m);fJ[xj][yj]=1;while(!q.empty()){node r=q.front();q.pop();if(r.x==N-1||r.x==0||r.y==M-1||r.y==0){cout<<r.ans+1<<endl;return ;}for(int i=0;i<4;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(ch[xi][yi]!='#'&&xi<N&&xi>=0&&yi<M&&yi>=0&&fJ[xi][yi]==0&&(r.ans+1<fF[xi][yi]||fF[xi][yi]==-1)){node f={xi,yi,r.ans+1};q.push(f);fJ[xi][yi]=1;}}}cout<<"IMPOSSIBLE"<<endl;return ; } int main() {int t;cin>>t;while(t--){cin>>N>>M;while(!q.empty())q.pop();memset(fF,0,sizeof fF);memset(fJ,0,sizeof fJ);for(int i=0;i<N;i++){for(int j=0;j<M;j++){fF[i][j]=-1;}}for(int i=0;i<N;i++){for(int j=0;j<M;j++){cin>>ch[i][j];if(ch[i][j]=='J')xj=i,yj=j;if(ch[i][j]=='F'){xf=i,yf=j;node f={xf,yf,0};q.push(f);fF[i][j]=0;}}}//bfs1();//bfs2();bfs(); /*for(int i=0;i<N;i++){for(int j=0;j<M;j++){cout<<fF[i][j]<<" ";}cout<<endl;} */} } /* 5 4 4 #### #JF# #..# #..# 3 3 ### #J. #.F 5 5 ####. .J#F. ###.. ..... ..... 5 5 ##### .J#F. .F#.. ###.. ..... 5 5 ##### ##J## ..F.. ##### ##### */

4 Fire Game

#include<iostream> #include<queue> #include<cstring> #include<map> #define MAX 15 using namespace std; struct node{int x;int y;int cnt; }; int T,N,M; int sum=0; int fm=0; int temp1; int flag=0; int anss=10000; int fp[MAX][MAX]; int dis[4][2]={{1,0},{-1,0},{0,1},{0,-1}}; char ch[MAX][MAX]; int vis[MAX*MAX][2]; queue<node>q; int bfs() {node r;while(!q.empty()){r=q.front();q.pop();node f;for(int i=0;i<4;i++){int xi=r.x+dis[i][0];int yi=r.y+dis[i][1];if(ch[xi][yi]=='#'&&fp[xi][yi]==0&&xi<N&&xi>=0&&yi<M&&yi>=0){f.x=xi;f.y=yi;f.cnt=r.cnt+1;fp[xi][yi]=1;q.push(f);fm++;}}}if(fm==sum){flag=1;return r.cnt;}return -1; } int main() {cin>>T;for(int l=1;l<=T;l++){cin>>N>>M;sum=0;temp1=0;for(int i=0;i<N;i++){for(int j=0;j<M;j++){cin>>ch[i][j];if(ch[i][j]=='#'){vis[temp1][0]=i;vis[temp1++][1]=j;sum++;}}}if(sum<=2){cout<<"Case "<<l<<": 0"<<endl;continue;}while(!q.empty())q.pop();anss=10000;flag=0;for(int i=0;i<temp1;i++){for(int j=0;j<temp1;j++){memset(fp,0,sizeof fp);fm=0;node a1={vis[i][0],vis[i][1],0};node a2={vis[j][0],vis[j][1],0};fp[a1.x][a1.y]=1;fp[a2.x][a2.y]=1;q.push(a1);q.push(a2);fm+=2;int op=bfs();if(op!=-1){anss=min(op,anss);}}}if(flag)cout<<"Case "<<l<<": "<<anss<<endl;elsecout<<"Case "<<l<<": -1"<<endl;} }

5 Find The Multiple

#include<iostream> #include<queue> #include<cstring> #include<map> #define MAX 100005 using namespace std; int N; long long x,y; void bfs() {queue<long long>q;q.push(x);while(!q.empty()){long long r=q.front();q.pop();if(r%N==0){cout<<r<<endl;return ;}x=r*10;y=x+1;q.push(x);q.push(y);}return ; } int main() {while(cin>>N){if(N==0)break;x=1;bfs();} }

總結

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