[0305] 10844번 - 쉬운 계단 수

src/Problem10844.java

@@ -0,0 +1,38 @@
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+
+public class Problem10844 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        int n = Integer.parseInt(br.readLine());
+        long MOD = 1_000_000_000;
+
+        long[][] dp = new long[n+1][10];
+
+        for(int i=1;i<=9;i++) dp[1][i] = 1;
+
+        for(int i=2;i<=n;i++){
+            dp[i][0] = dp[i-1][1];
+            dp[i][9] = dp[i-1][8];
+
+            for(int j=1;j<=8;j++){
+                dp[i][j] = (dp[i-1][j-1] + dp[i-1][j+1]) % MOD;
+            }
+        }
+
+        long ans = 0;
+        for(int i=0;i<=9;i++){
+            ans = (ans + dp[n][i]) % MOD;
+        }
+
+        bw.write(String.valueOf(ans));
+        bw.flush();
+        bw.close();
+
+    }
+}

src/Problem15486.java

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+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+public class Problem15486 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        int n = Integer.parseInt(br.readLine());
+        int[] t = new int[n];
+        int[] p = new int[n];
+        int[] dp = new int[n + 1];
+
+        for (int i = 0; i < n; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            t[i] = Integer.parseInt(st.nextToken());
+            p[i] = Integer.parseInt(st.nextToken());
+        }
+
+        dp[n] = 0;
+
+        for (int i = n-1; i > -1; i--) {
+            if (t[i] + i > n) {
+                dp[i] = dp[i + 1];
+            }
+            else {
+                dp[i] = Math.max(dp[i + t[i]] + p[i], dp[i + 1]);
+            }
+        }
+
+        bw.write(String.valueOf(dp[0]));
+        bw.flush();
+        bw.close();
+    }
+}

src/Problem2240.java

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+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.BufferedWriter;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+public class Problem2240 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int t = Integer.parseInt(st.nextToken());
+        int w = Integer.parseInt(st.nextToken());
+        int max = 0;
+
+        int[][][] dp = new int [w + 1][t + 1][2];
+        int[] arr = new int[t + 1];
+        arr[0] = 1;
+        dp[0][0][0] = 0;
+
+        for (int i = 1; i <= t; i++) {
+            arr[i] = Integer.parseInt(br.readLine());
+            dp[0][i][0] = 0;
+            dp[0][i][1] = 0;
+        }
+
+        for (int i = 1; i < t + 1; i++) {
+            dp[0][i][0] = dp[0][i - 1][0] + (arr[i] == 1 ? 1 : 0);
+
+            for(int j = 1; j < Math.min(i + 1, w + 1) ; j++ ) {
+                for(int k = 0; k < 2; k++) {
+                    dp[j][i][k] = Math.max(dp[j][i - 1][k], dp[j - 1][i - 1][1 - k]) + (k + 1 == arr[i] ? 1 : 0);
+
+                    if (max < dp[j][i][k]) {
+                        max = dp[j][i][k];
+                    }
+                }
+            }
+        }
+
+        bw.write(String.valueOf(max));
+        bw.flush();
+        bw.close();
+    }
+}

src/Problem2748.java

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+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.IOException;
+
+public class Problem2748 {
+    public static void main(String[] args) throws IOException{
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        int n = Integer.parseInt(br.readLine());
+
+        long dp1 = 0;
+        long dp2 = 1;
+
+        if (n  == 0) {
+            bw.write(String.valueOf(dp1));
+        }
+        else if (n == 1) {
+            bw.write(String.valueOf(dp2));
+        }
+        else {
+            for (int i = 2; i <= n; i++) {
+                long temp = dp2;
+                dp2 = dp1 + dp2;
+                dp1 = temp;
+            }
+            bw.write(String.valueOf(dp2));
+        }
+
+        bw.flush();
+        bw.close();
+    }
+}