結果

問題 No.743 Segments on a Polygon
ユーザー hiromi_ayasehiromi_ayase
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
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 10
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

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() {
@Override
public 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));
}
}
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