江西省赛题解 A B H J K L

链接

A、Mio visits ACGN Exhibition

 1 /*
 2 f[i][j][k] : 从(1, 1) -> (i, j)的经过k个0的方案数:
 3 {
 4 a[i][j] = 0 : f[i][j - 1][k - 1] + f[i - 1][j][k - 1]
 5 a[i][j] = 1 : f[i][j - 1][k] + f[i - 1][j][k]
 6 }
 7 至多经过 n + m - 1个 0 或 1，
 8 所以只用一维就可以记录0的个数，1的个数可以反推
 9 */
10 #include <bits/stdc++.h>
11 using namespace std;
12 
13 const int N = 510;
14 const int M = 1010;
15 const int mod = 998244353;
16 int n, m, p, q;
17 int a[N][N];
18 int f[2][N][M];
19 
20 void accept(){
21     cin >> n >> m >> p >> q;
22     for(int i = 1; i <= n; ++i){
23         for(int j = 1; j <= m; ++j){
24             cin >> a[i][j];
25         }
26     }
27 
28     if(a[1][1] == 1) f[1][1][0] = 1;
29     else f[1][1][1] = 1;
30 
31     for(int i = 1; i <= n; ++i){
32         for(int j = 1; j <= m; ++j){
33             if(i == 1 && j == 1) continue;
34             if(a[i][j]){
35                 for(int k = 0; k < M; ++k){
36                     f[1][j][k] = (f[1][j - 1][k] + f[0][j][k]) % mod;
37                 }
38             }else{
39                 f[1][j][0] = 0; // 这里需要清0 因为会重复计算贡献
40                 for(int k = 1; k < M; ++k){
41                     f[1][j][k] = (f[1][j - 1][k - 1] + f[0][j][k - 1]) % mod;
42                 }
43             }
44         }
45         for(int j = 1; j <= m; ++j){
46             for(int k = 0; k < M; ++k){
47                 f[0][j][k] = f[1][j][k];
48             }
49         }
50     }
51 
52     int ans = 0;
53     for(int i = p; i <= n + m - 1 - q; ++i){
54         ans = (ans + f[0][m][i]) % mod;
55     }
56 
57     cout << ans;
58 }
59 
60 signed main(){
61     ios::sync_with_stdio(false);
62     cin.tie(nullptr);
63     accept();
64 
65     return 0;
66 }

B、 Continued Fraction

 1 #include <bits/stdc++.h>
 2 
 3 #define int long long
 4 using namespace std;
 5 
 6 signed main() {
 7     int t;
 8     cin >> t;
 9     while (t--) {
10         int m, n;
11         cin >> m >> n;
12         int pre ;
13         queue<int> q;
14 
15         while (n > 0 && m >= 0) {
16             pre = m / n;
17             q.push(pre);
18             m = m - pre * n;
19             swap(m, n);
20 
21         }
22         cout << q.size() - 1 << ' ';
23         while (!q.empty()) {
24             cout << q.front() << ' ';
25             q.pop();
26         }
27         cout << endl;
28     }
29     return 0;
30 }

H、Hearthstone So Easy

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
signed main() {
    int t;
    cin >> t;
    while(t--) {
        int a, b;
        cin >> a >> b;
        if(a == 1) {
            cout << "freesin" << endl;
            continue;
        }
        if(a - b <= 1) {
            cout << "pllj" << endl;
        } else {
            cout << "freesin" << endl;
        };
    }
    return 0;
}

J、 LRU 

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 
 4 const int N = 1e5 + 10;
 5 map<int, int> mp;
 6 set<int> but;
 7 int a[N], n, k;
 8 
 9 bool check(int len) {
10     mp.clear();
11     but.clear();
12     int cnt = 0;
13     queue<int> q; //使用队列维护存在时间最长的缓存
14     for(int i = 1; i <= n; ++i) {
15         q.push(a[i]);
16         if(mp[a[i]]) {
17             cnt++;
18             mp[a[i]]++;
19         } else {
20             mp[a[i]]++;
21             if(but.size() < len) but.insert(a[i]);
22             else {
23                 while(!q.empty()) {
24                     int now = q.front();
25                     q.pop();
26                     mp[now]--;
27                     //只有出现次数为0了，才是要删除的缓存块
28                     if(mp[now] == 0) {
29                         but.erase(now);
30                         break;
31                     }
32                 }
33             }
34             but.insert(a[i]);
35         }
36     }
37     return cnt >= k;
38 }
39 
40 void accept() {
41     //二分查找
42     int l = 1, r = n;
43     while(l < r) {
44         int mid = l + r >> 1;
45         if(check(mid)) r = mid;
46         else l = mid + 1;
47     }
48     cout << l;
49 }
50 
51 signed main() {
52     ios::sync_with_stdio(false);
53     cin.tie(nullptr);
54 
55     cin >> n >> k;
56     for(int i = 1; i <= n; ++i) {
57         cin >> a[i];
58         mp[a[i]]++;
59     }
60     
61     //计算最大的击中数
62     int res = 0;
63     for(int i = 1; i <= n; ++i) {
64         if(mp[a[i]] > 1) res += mp[a[i]] - 1;
65         mp[a[i]] = 0;
66     }
67     if(res < k) {
68         cout << "cbddl";
69         return 0;
70     }
71 
72     accept();
73     return 0;
74 }

K、Many Littles Make a Mickle

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 #define int long long
 4 #define endl "\n"
 5 
 6 signed main() {
 7     int t;
 8     cin >> t;
 9     while(t--) {
10         int a, b;
11         cin >> a >> b;
12         int sum = 0;
13         for(int i = 1; i <= a; i++) {
14             sum += i * i;
15         }
16         cout << b*sum << endl;
17     }
18     return 0;
19 }

L、It Rains Again

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 #define int long long
 4 #define endl "\n"
 5 
 6 int a[234567];
 7 signed main() {
 8     int t;
 9     cin >> t;
10     int x, y, x1, y1;
11     int maxx = -1;
12     for(int i = 0; i < t; i++) {
13 
14         cin >> x >> y >> x1 >> y1;
15         maxx = max(maxx, x1);
16         a[x + 1] = 1;
17         a[x1 + 1] = -1;
18     }
19     int cnt = 0;
20 
21     for(int i = 1; i <= maxx; i++) {
22         a[i] += a[i - 1];
23     }
24 
25     for(int i = 1; i <= maxx; i++) {
26         if(a[i]) {
27             cnt++;
28         }
29     }
30 
31     cout << cnt << endl;
32     //cout<<a[100000]<<endl;
33     return 0;
34 }

 

posted @ 2022-03-29 09:31  std&ice  阅读(104)  评论(0)  编辑  收藏  举报