PAT 甲级真题题解（121-155）

Posted 2021-11-30 ehanla

1121 Damn Single

模拟

 1 // 1121 Damn Single
 2 #include <map>
 3 #include <vector>
 4 #include <cstdio>
 5 #include <iostream>
 6 #include <algorithm>
 7 using namespace std;
 8 
 9 map<int, int> m, vis;
10 vector<int> p;
11 const int N = 1e4 + 10;
12 int a[N];
13 
14 int main() {
15     int n, x, y;
16     scanf("%d", &n);
17     while (n--) {
18         scanf("%d %d", &x, &y);
19         x++; y++;
20         m[x] = y;
21         m[y] = x;
22     }
23     scanf("%d", &n);
24     for (int i = 1; i <= n; i++) {
25         scanf("%d", &a[i]);
26         a[i]++;
27         vis[a[i]] = 1;
28     }
29     for (int i = 1; i <= n; i++) {
30         if (vis[ m[a[i]] ]) continue;
31         p.push_back(a[i]);
32     }
33     sort(p.begin(), p.end());
34     printf("%d\n", p.size());
35     for (int i = 0; i < p.size(); i++) {
36         if (i != 0) printf(" ");
37         printf("%05d", p[i] - 1);
38     }
39     return 0;
40 }

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1122 Hamiltonian Cycle

模拟

 1 // 1122 Hamiltonian Cycle
 2 #include <set>
 3 #include <cstdio>
 4 #include <cstring>
 5 #include <iostream>
 6 #include <algorithm>
 7 using namespace std;
 8 
 9 const int N = 205;
10 int MAP[N][N];
11 set<int> s;
12 
13 int main() {
14     memset(MAP, -1, sizeof(MAP));
15     int n, m, k;
16     scanf("%d %d", &n, &m);
17     for (int i = 1; i <= m; i++) {
18         int u, v;
19         scanf("%d %d", &u, &v);
20         MAP[u][v] = 1; MAP[v][u] = 1;
21     }
22     scanf("%d", &k);
23     while (k--) {
24         bool f = 1;
25         int u, v, root;
26         scanf("%d", &m);
27         scanf("%d", &root);
28         s.insert(root);
29         u = root;
30         for (int i = 1; i < m; i++) {
31             scanf("%d", &v);
32             s.insert(v);
33             if (MAP[u][v] == -1) f = 0;
34             u = v;
35         }
36         if (root != u || s.size() != n || m != n + 1) f = 0;
37         if (!f) printf("NO\n");
38         else printf("YES\n");
39         s.clear();
40     }
41     return 0;
42 }

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1124 Raffle for Weibo Followers

MAP标记

 1 // 1124 Raffle for Weibo Followers
 2 #include <map>
 3 #include <cstdio>
 4 #include <vector>
 5 #include <iostream>
 6 #include <algorithm>
 7 using namespace std;
 8 
 9 map<string, int> vis;
10 string str;
11 
12 int main() {
13     bool f = 0;
14     int n, m, s, cnt;
15     cin >> n >> m >> s;
16     cnt = m;
17     for (int i = 1; i < s; i++) cin >> str;
18     for (int i = s; i <= n; i++) {
19         cin >> str;
20         if (cnt == m && !vis[str]) {
21             f = 1;
22             cout << str << endl;
23             cnt = 1;
24             vis[str] = 1;
25         }
26         if (!vis[str]) cnt++;
27     }
28     if (!f) cout << "Keep going..." << endl;
29     return 0;
30 }

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1125 Chain the Ropes

思维

 1 // 1125 Chain the Ropes
 2 #include <cstdio>
 3 #include <iostream>
 4 #include <algorithm>
 5 using namespace std;
 6 
 7 const int N = 1e4 + 10;
 8 int a[N];
 9 
10 int main() {
11     int n, ans = 0;
12     cin >> n;
13     for (int i = 1; i <= n; i++) cin >> a[i];
14     sort(a + 1, a + 1 + n);
15     ans = a[1];
16     for (int i = 2; i <= n; i++) {
17         ans += a[i];
18         ans /= 2;
19     }
20     cout << ans << endl;
21     return 0;
22 }

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