結果
問題 | No.743 Segments on a Polygon |
ユーザー |
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提出日時 | 2018-10-06 18:17:25 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 451 ms / 2,000 ms |
コード長 | 4,983 bytes |
コンパイル時間 | 2,521 ms |
コンパイル使用メモリ | 90,168 KB |
実行使用メモリ | 62,976 KB |
最終ジャッジ日時 | 2024-11-14 12:37:34 |
合計ジャッジ時間 | 8,143 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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ファイルパターン | 結果 |
---|---|
other | AC * 10 |
ソースコード
import java.util.Arrays;class SegmentTreeRSQ {public int M, H, N;public long[] st;public long[] plus;public SegmentTreeRSQ(int n){N = n;M = Integer.highestOneBit(Math.max(N-1, 1))<<2;H = M>>>1;st = new long[M];plus = new long[H];}public SegmentTreeRSQ(int[] a){N = a.length;M = Integer.highestOneBit(Math.max(N-1, 1))<<2;H = M>>>1;st = new long[M];plus = new long[H];for(int i = 0;i < N;i++){st[H+i] = a[i];}for(int i = (M>>1)-1;i >= 1;i--){propagate(i);}}public void add(int pos, int v){for(int i = H+pos;i >= 1;i >>>= 1){st[i] += v;}}private void propagate(int i){int count = H/Integer.highestOneBit(i);st[i] = st[2*i]+st[2*i+1]+plus[i]*count;}public void add(int l, int r, int v) { if(l < r)add(l, r, v, 0, H, 1); }private void add(int l, int r, int v, int cl, int cr, int cur){if(cur >= H){st[cur] += v;}else if(l <= cl && cr <= r){plus[cur] += v;propagate(cur);}else{int mid = cl+cr>>>1;if(cl < r && l < mid){add(l, r, v, cl, mid, 2*cur);}if(mid < r && l < cr){add(l, r, v, mid, cr, 2*cur+1);}propagate(cur);}}private long gsum;public long sum(int l, int r) {gsum = 0;sum(l, r, 0, H, 1);return gsum;}private void sum(int l, int r, int cl, int cr, int cur){if(l <= cl && cr <= r){gsum += st[cur];}else{int mid = cl+cr>>>1;if(cl < r && l < mid){sum(l, r, cl, mid, 2*cur);}if(mid < r && l < cr){sum(l, r, mid, cr, 2*cur+1);}gsum += plus[cur]*(Math.min(r,cr)-Math.max(l,cl));}}}public class Main {private static void solve() {int n = ni();int m = ni();int[] out = new int[m];int[] in = new int[m];Arrays.fill(out, -1);Arrays.fill(in, -1);for (int i = 0; i < n; i ++) {int a = ni();int b = ni();if (a > b) {int tmp = a;a = b;b = tmp;}out[a] = i;in[b] = a;}SegmentTreeRSQ st = new SegmentTreeRSQ(m);long ret = 0;for (int i = 0; i < m; i ++) {if (out[i] >= 0) {st.add(i, 1);} else if (in[i] >= 0) {ret += st.sum(in[i] + 1, i);st.add(in[i], -1);}}System.out.println(ret);}public static void main(String[] args) {new Thread(null, new Runnable() {@Overridepublic void run() {long start = System.currentTimeMillis();String debug = args.length > 0 ? args[0] : null;if (debug != null) {try {is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug));} catch (Exception e) {throw new RuntimeException(e);}}reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768);solve();out.flush();tr((System.currentTimeMillis() - start) + "ms");}}, "", 64000000).start();}private static java.io.InputStream is = System.in;private static java.io.PrintWriter out = new java.io.PrintWriter(System.out);private static java.util.StringTokenizer tokenizer = null;private static java.io.BufferedReader reader;public static String next() {while (tokenizer == null || !tokenizer.hasMoreTokens()) {try {tokenizer = new java.util.StringTokenizer(reader.readLine());} catch (Exception e) {throw new RuntimeException(e);}}return tokenizer.nextToken();}private static double nd() {return Double.parseDouble(next());}private static long nl() {return Long.parseLong(next());}private static int[] na(int n) {int[] a = new int[n];for (int i = 0; i < n; i++)a[i] = ni();return a;}private static char[] ns() {return next().toCharArray();}private static long[] nal(int n) {long[] a = new long[n];for (int i = 0; i < n; i++)a[i] = nl();return a;}private static int[][] ntable(int n, int m) {int[][] table = new int[n][m];for (int i = 0; i < n; i++) {for (int j = 0; j < m; j++) {table[i][j] = ni();}}return table;}private static int[][] nlist(int n, int m) {int[][] table = new int[m][n];for (int i = 0; i < n; i++) {for (int j = 0; j < m; j++) {table[j][i] = ni();}}return table;}private static int ni() {return Integer.parseInt(next());}private static void tr(Object... o) {if (is != System.in)System.out.println(java.util.Arrays.deepToString(o));}}