A
水
1 #include <iostream>
2 #include <cstdio>
3 #include <algorithm>
4 #include <list>
5 #include <map>
6 #include <stack>
7 #include <vector>
8 #include <cstring>
9 #include <sstream>
10 #include <string>
11 #include <cmath>
12 #include <queue>
13 using namespace std;
14 #define clc(a,b) memset(a,b,sizeof(a))
15 #define inf 0x3f3f3f3f
16 const int N=10010;
17 const int MOD = 1e9+7;
18 #define LL long long
19 void fre() {
20 freopen("in.txt","r",stdin);
21 }
22 inline int r() {
23 int x=0,f=1;char ch=getchar();
24 while(ch>‘9‘||ch<‘0‘) {if(ch==‘-‘) f=-1;ch=getchar();}
25 while(ch>=‘0‘&&ch<=‘9‘) { x=x*10+ch-‘0‘;ch=getchar();}return x*f;
26 }
27
28 int main(){
29 int T;
30 T=r();
31 while(T--){
32 int x,y;
33 int ans;
34 x=r();
35 y=r();
36 if(x%y!=0)
37 ans=x/y+1;
38 else
39 ans=x/y;
40 cout<<ans<<endl;
41 }
42 return 0;
43 }
C
最短路
反向建边，记录当前点序号最小的前驱
1 #include <iostream>
2 #include <cstdio>
3 #include <algorithm>
4 #include <list>
5 #include <map>
6 #include <stack>
7 #include <vector>
8 #include <cstring>
9 #include <sstream>
10 #include <string>
11 #include <cmath>
12 #include <queue>
13 #include <bits/stdc++.h>
14 using namespace std;
15 #define clc(a,b) memset(a,b,sizeof(a))
16 #define inf 0x3f3f3f3f
17 const int N=100010;
18 const int MOD = 1e9+7;
19 #define LL long long
20 void fre() {
21 freopen("in.txt","r",stdin);
22 }
23 inline int r() {
24 int x=0,f=1;char ch=getchar();
25 while(ch>‘9‘||ch<‘0‘) {if(ch==‘-‘) f=-1;ch=getchar();}
26 while(ch>=‘0‘&&ch<=‘9‘) { x=x*10+ch-‘0‘;ch=getchar();}return x*f;
27 }
28 int n,m;
29 struct node{
30 int v,c;
31 node(int vv,int cc){
32 v=vv;
33 c=cc;
34 }
35 node(){}
36 bool operator <(const node &r) const{
37 return c>r.c;
38 }
39 };
40
41 struct edge{
42 int v,cost;
43 edge(int vv=0,int ccost =0):v(vv),cost(ccost){}
44 };
45
46 vector<edge>e[N];
47 bool vis[N];
48 int dist[N];
49 int p[N];
50 void dij(int start){
51 clc(vis,false);
52 for(int i=0;i<=n+1;i++) dist[i]=inf;
53 priority_queue<node>q;
54 while(!q.empty()) q.pop();
55 dist[start]=0;
56 q.push(node(start,0));
57 node tmp;
58 while(!q.empty()){
59 tmp=q.top();
60 q.pop();
61 int u=tmp.v;
62 if(vis[u]) continue;
63 vis[u]=true;
64 for(int i=0;i<e[u].size();i++){
65 int v=e[u][i].v;
66 int cost=e[u][i].cost;
67 if(!vis[v]&&dist[v]>dist[u]+cost){
68 dist[v]=dist[u]+cost;
69 p[v]=u;
70 q.push(node(v,dist[v]));
71 }
72 else if(!vis[v]&&dist[v]==dist[u]+cost){
73 p[v]=min(p[v],u);
74 }
75 }
76 }
77 }
78 void add(int u,int v,int w){
79 e[u].push_back(edge(v,w));
80 }
81
82 void init(){
83 for(int i=0;i<=n+1;i++){
84 e[i].clear();
85 }
86 clc(p,-1);
87 }
88
89 int main(){
90 // fre();
91 int T;
92 T=r();
93 while(T--){
94 n=r(),m=r();
95 init();
96 int u,v,w;
97 while(m--){
98 u=r(),v=r(),w=r();
99 add(v,u,w);
100 }
101 dij(n+1);
102 if(dist[0]>=inf){
103 printf("-1\n");
104 continue;
105 }
106 else if(p[0]==n+1){
107 printf("0\n");
108 continue;
109 }
110 else
111 printf("%d\n",p[0]);
112 }
113 return 0;
114 }
D
1 #include <iostream>
2 #include <cstdio>
3 #include <algorithm>
4 #include <list>
5 #include <map>
6 #include <stack>
7 #include <vector>
8 #include <cstring>
9 #include <sstream>
10 #include <string>
11 #include <cmath>
12 #include <queue>
13 using namespace std;
14 #define clc(a,b) memset(a,b,sizeof(a))
15 #define inf 0x3f3f3f3f
16 const int N=200010;
17 const int MOD = 1e9+7;
18 #define LL long long
19 void fre() {
20 freopen("in.txt","r",stdin);
21 }
22 inline int r() {
23 int x=0,f=1;char ch=getchar();
24 while(ch>‘9‘||ch<‘0‘) {if(ch==‘-‘) f=-1;ch=getchar();}
25 while(ch>=‘0‘&&ch<=‘9‘) { x=x*10+ch-‘0‘;ch=getchar();}return x*f;
26 }
27 struct node{
28 int s,w,num;
29 }p[N];
30 int n,R,q;
31 node a[N],b[N];
32
33 bool cmp(const node &a,const node &b){
34 return (a.s==b.s)?(a.num<b.num):(a.s>b.s);
35 }
36
37 void work(){
38 int ai=1,bi=1;
39 for(int i=1;i<=2*n;i+=2){
40 if(p[i].w>p[i+1].w){
41 p[i].s++;
42 a[ai++]=p[i];
43 b[bi++]=p[i+1];
44 }
45 else{
46 p[i+1].s++;
47 a[ai++]=p[i+1];
48 b[bi++]=p[i];
49 }
50 }
51 int i=1,j=1,k=1;
52 while(i<ai&&j<bi){
53 if(cmp(a[i],b[j])){
54 p[k++]=a[i++];
55 }
56 else
57 p[k++]=b[j++];
58 }
59 while(i<ai) p[k++]=a[i++];
60 while(j<bi) p[k++]=b[j++];
61 }
62
63 int main(){
64 // fre();
65 int T;
66 T=r();
67 while(T--){
68 n=r(),R=r(),q=r();
69 for(int i=1;i<=2*n;i++){
70 int x;
71 x=r();
72 p[i].s=x;
73 p[i].num=i;
74 }
75 for(int i=1;i<=2*n;i++){
76 int x;
77 x=r();
78 p[i].w=x;
79 }
80 sort(p+1,p+1+2*n,cmp);
81 for(int i=1;i<=R;i++){
82 work();
83 }
84 printf("%d\n",p[q].num);
85 }
86 return 0;
87 }
F
dp记忆话搜索
dp[i][j][k][inx][last]:当前三种水果分别有i j k个的时候且当前放第inx类的水果，持续了last天的方案数
1 #include <iostream>
2 #include <cstdio>
3 #include <algorithm>
4 #include <list>
5 #include <map>
6 #include <stack>
7 #include <vector>
8 #include <cstring>
9 #include <sstream>
10 #include <string>
11 #include <cmath>
12 #include <queue>
13 using namespace std;
14 #define clc(a,b) memset(a,b,sizeof(a))
15 #define inf 0x3f3f3f3f
16 const int N=10010;
17 const int MOD = 1e9+7;
18 #define LL long long
19 void fre() {
20 freopen("in.txt","r",stdin);
21 }
22 inline int r() {
23 int x=0,f=1;char ch=getchar();
24 while(ch>‘9‘||ch<‘0‘) {if(ch==‘-‘) f=-1;ch=getchar();}
25 while(ch>=‘0‘&&ch<=‘9‘) { x=x*10+ch-‘0‘;ch=getchar();}return x*f;
26 }
27
28 int num;
29 int dp[51][51][51][3][51];
30 int a[3],b[3];
31
32 int dfs(int n,int a0,int a1,int a2,int inx,int last){
33 LL ans=0;
34 if(dp[a0][a1][a2][inx][last]!=-1) return dp[a0][a1][a2][inx][last];
35 if(n==num) return dp[a0][a1][a2][inx][last]=1;
36 if(inx==-1){
37 if(b[0]>0&&a0>=1) ans+=dfs(n+1,a0-1,a1,a2,0,1);
38 if(b[1]>0&&a1>=1) ans+=dfs(n+1,a0,a1-1,a2,1,1);
39 if(b[2]>0&&a2>=1) ans+=dfs(n+1,a0,a1,a2-1,2,1);
40 }
41 else{
42 if(inx==0){
43 if(last+1<=b[0]&&a0>=1) ans+=dfs(n+1,a0-1,a1,a2,0,last+1);
44 if(b[1]>0&&a1>=1) ans+=dfs(n+1,a0,a1-1,a2,1,1);
45 if(b[2]>0&&a2>=1) ans+=dfs(n+1,a0,a1,a2-1,2,1);
46 }
47 else if(inx==1){
48 if(last+1<=b[1]&&a1>=1) ans+=dfs(n+1,a0,a1-1,a2,1,last+1);
49 if(b[0]>0&&a0>=1) ans+=dfs(n+1,a0-1,a1,a2,0,1);
50 if(b[2]>0&&a2>=1) ans+=dfs(n+1,a0,a1,a2-1,2,1);
51 }
52 else{
53 if(last+1<=b[2]&&a2>=1) ans+=dfs(n+1,a0,a1,a2-1,2,last+1);
54 if(b[0]>0&&a0>=1) ans+=dfs(n+1,a0-1,a1,a2,0,1);
55 if(b[1]>0&&a1>=1) ans+=dfs(n+1,a0,a1-1,a2,1,1);
56 }
57 }
58 ans%=MOD;
59 return dp[a0][a1][a2][inx][last]=ans;
60 }
61
62 int main(){
63 int T;
64 T=r();
65 while(T--){
66 clc(dp,-1);
67 for(int i=0;i<3;i++){
68 // scanf("%d",&a[i]);
69 int x;
70 x=r();
71 a[i]=x;
72 }
73 for(int i=0;i<3;i++){
74 // scanf("%d",&b[i]);
75 int x;
76 x=r();
77 b[i]=x;
78 }
79 num=a[0]+a[1]+a[2];
80 printf("%d\n",dfs(0,a[0],a[1],a[2],-1,0));
81 }
82 return 0;
83 }
时间： 2024-08-19 04:43:16