小計算器

 1 #include<bits/stdc++.h>
 2 #define ll long long
 3 #define ull unsigned long long
 4 #define mem(a,x) memset(a,x,sizeof(a))
 5 using namespace std;
 6 
 7 const int MAXN=1e6+5;
 8 
 9 int ope,cnt,a[MAXN];
10 ll n,tmp,ans,k;
11 string s,tmps;
12 
13 void change2ten() {
14
 
     tmp=0;
15     for(int i=0; i<tmps.size(); ++i) {
16         tmp*=k;
17         if(tmps[i]<=‘9‘&&tmps[i]>=‘0‘) {
18             tmp+=tmps[i]-‘0‘;
19         } else {
20             tmp+=tmps[i]-‘A‘+10;
21         }
22     }
23 }
24 
25 void change2k() {
26     if(!ans) {cout<<0
 
<<endl; return;}
27     cnt=0,tmp=ans;
28     while(tmp) {
29         a[++cnt]=tmp%k;
30         tmp/=k;
31     }
32     for(int i=cnt; i>=1; --i)
33         if(a[i]<=9) cout<<a[i];
34         else printf("%c",a[i]+‘A‘-10);
35     cout<<endl;
36 }
37 
38 int main() {
 
39     cin>>n;
40     k=10;
41     for(int i=1; i<=n; ++i) {
42         cin>>s;
43         if(s=="EQUAL") change2k();
44         else if(s=="CLEAR") tmp=ans=ope=0;
45         else if(s=="ADD")
46             ope=1;
47         else if(s=="SUB")
48             ope=2;
49         else if(s=="MUL")
50             ope=3;
51         else if(s=="DIV")
52             ope=4;
53         else if(s=="MOD")
54             ope=5;
55         else if(s=="NUM") {
56             cin>>tmps;
57             change2ten();
58             switch(ope) {
59                 case 0:
60                     ans=tmp;
61                     break;
62                 case 1:
63                     ans+=tmp;
64                     break;
65                 case 2:
66                     ans-=tmp;
67                     break;
68                 case 3:
69                     ans*=tmp;
70                     break;
71                 case 4:
72                     ans/=tmp;
73                     break;
74                 case 5:
75                     ans%=tmp;
76                     break;
77             }
78         } else if(s=="CHANGE")
79             cin>>k;
80 
81     }
82 }

合根植物

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 
 4 const int MAXN=1e6+5;
 5 
 6 int par[MAXN];
 7 int n,a,b,x,y;
 8 
 9 void init() {
10     for(int i=0; i<=a*b; ++i) par[i]=i;
11 }
12 
13 int Find (int a) {
14     return a == par[a] ? a : par[a] = Find (par[a]);
15 }
16 
17 void join (int a, int b) {
18     par[Find (a)] = Find (b);
19 }
20 
21 int main() {
22     int cnt=0;
23     scanf("%d %d %d",&a,&b,&n);
24     init();
25     for(int i=1; i<=n; ++i) {
26         scanf("%d %d",&x,&y);
27         join(x,y);
28     }
29     for(int i=1; i<=a*b; ++i) if(par[i]==i) ++cnt;
30     cout<<cnt<<endl;
31 }

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