結果
| 問題 |
No.860 買い物
|
| コンテスト | |
| ユーザー |
 Oland
|
| 提出日時 | 2019-08-09 23:38:54 |
| 言語 | Java (openjdk 23) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 8,424 bytes |
| コンパイル時間 | 2,533 ms |
| コンパイル使用メモリ | 81,256 KB |
| 実行使用メモリ | 63,828 KB |
| 最終ジャッジ日時 | 2024-07-19 15:57:01 |
| 合計ジャッジ時間 | 6,401 ms |
|
ジャッジサーバーID （参考情報） |
judge4 / judge1 |
（要ログイン）
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 4 TLE * 1 -- * 10 |
ソースコード
import java.io.*;
import java.lang.reflect.Array;
import java.util.*;
import java.util.Map.Entry;
import java.util.function.Function;
import java.util.stream.Collectors;
@SuppressWarnings("unused")
public class Main {
FastScanner in = new FastScanner(System.in);
PrintWriter out = new PrintWriter(System.out);
final int MOD = (int)1e9+7;
void printlnYN(boolean b){out.println((b ? "Yes" : "No"));}
//System.out.println();はつかわない！！
void solve() throws Exception{
//https://qiita.com/drken/items/a5e6fe22863b7992efdb#5-%E5%8C%BA%E9%96%93%E3%82%92%E5%88%86%E5%89%B2%E3%81%99%E3%82%8B%E5%95%8F%E9%A1%8C-----%E5%88%86%E3%81%8B%E3%81%A1%E6%9B%B8%E3%81%8D%E3%81%AA%E3%81%A9
int N = in.nextInt();
long[] C = new long[N], D = new long[N];
long sum = 0;
for(int i = 0; i < N; i++){
C[i] = in.nextInt();
D[i] = in.nextInt();
sum += C[i] + D[i];
}
SegmentTree seg = new SegmentTree(C);
long[] dp = new long[N];
Arrays.fill(dp, Long.MAX_VALUE / 2);
dp[0] = -D[0];
for(int t = 1; t < N; t++) {
for (int i = 0; i < t; i++) {
dp[t] = Math.min(dp[t], dp[i] + seg.getSegment(i, t) - D[t]);
}
}
long ans = Long.MAX_VALUE / 2;
for(int i = 0; i < N; i++) ans = Math.min(ans, dp[i] + seg.getSegment(i, N));
ans += sum;
out.println(ans);
}
class SegmentTree{
int n;
long[] node;
/*二項演算で使える単位元*/
private long e = Integer.MAX_VALUE;
//private long e = 0;
/*結合律が成り立つ、要素同士の二項演算*/
private long f(long e1, long e2){
return Math.min(e1, e2); //区間最小値
//return e1 + e2; //区間和
}
/*要素更新用の演算(可換でなくてもよい)*/
private long g(long nodeVal, long val){
return val; //更新
//return nodeVal + val; //加算
}
/* 単位元で初期化 */
public SegmentTree(int sz){
n = 1;
while(n < sz) n *= 2;
node = new long[2*n];
Arrays.fill(node, e);
}
/* 元配列vでセグメント木を初期化 */
public SegmentTree(long[] v){
this(v.length);
for(int i = 0; i < v.length; i++)
node[i+n] = v[i];
for(int i = n-1; i > 0; i--)
node[i] = f(node[2*i+0], node[2*i+1]);
}
public long getPoint(int x){
return node[x + n];
}
/* 0-indexed:xの要素をg(node[x], val)に更新 */
public void setPoint(int x, long val){
x += n;
node[x] = g(node[x], val);
while(x > 1){
x = x / 2;
node[x] = f(node[2*x+0], node[2*x+1]);
}
}
/* 指定した区間[L,R)の区間演算の結果を求めるクエリ */
public long getSegment(int L, int R){
L += n;
R += n;
long resL = e, resR = e;
while (L < R) {
if ((L & 1) != 0){
resL = f(resL, node[L]);
L++;
}
if ((R & 1) != 0){
--R;
resR = f(resR, node[R]);
}
L >>= 1;
R >>= 1;
}
return f(resL, resR);
}
}
public static void main(String[] args) throws Exception {
new Main().m();
}
void m() throws Exception {
solve();
out.flush();
}
class FastScanner {
Reader input;
FastScanner() {this(System.in);}
FastScanner(InputStream stream) {this.input = new BufferedReader(new InputStreamReader(stream));}
int nextInt() {return (int) nextLong();}
long nextLong() {
try {
int sign = 1;
int b = input.read();
while ((b < '0' || '9' < b) && b != '-' && b != '+') {
b = input.read();
}
if (b == '-') {
sign = -1;
b = input.read();
} else if (b == '+') {
b = input.read();
}
long ret = b - '0';
while (true) {
b = input.read();
if (b < '0' || '9' < b) return ret * sign;
ret *= 10;
ret += b - '0';
}
} catch (IOException e) {
e.printStackTrace();
return -1;
}
}
double nextDouble() {
try {
double sign = 1;
int b = input.read();
while ((b < '0' || '9' < b) && b != '-' && b != '+') {
b = input.read();
}
if (b == '-') {
sign = -1;
b = input.read();
} else if (b == '+') {
b = input.read();
}
double ret = b - '0';
while (true) {
b = input.read();
if (b < '0' || '9' < b) break;
ret *= 10;
ret += b - '0';
}
if (b != '.') return sign * ret;
double div = 1;
b = input.read();
while ('0' <= b && b <= '9') {
ret *= 10;
ret += b - '0';
div *= 10;
b = input.read();
}
return sign * ret / div;
} catch (IOException e) {
e.printStackTrace();
return Double.NaN;
}
}
char nextChar() {
try {
int b = input.read();
while (Character.isWhitespace(b)) {
b = input.read();
}
return (char) b;
} catch (IOException e) {
e.printStackTrace();
return 0;
}
}
String nextStr() {
try {
StringBuilder sb = new StringBuilder();
int b = input.read();
while (Character.isWhitespace(b)) {
b = input.read();
}
while (b != -1 && !Character.isWhitespace(b)) {
sb.append((char) b);
b = input.read();
}
return sb.toString();
} catch (IOException e) {
e.printStackTrace();
return "";
}
}
public int[] nextIntArray(int n) {
int[] res = new int[n];
for (int i = 0; i < n; i++) {
res[i] = nextInt();
}
return res;
}
public int[] nextIntArrayDec(int n) {
int[] res = new int[n];
for (int i = 0; i < n; i++) {
res[i] = nextInt() - 1;
}
return res;
}
public int[] nextIntArray1Index(int n) {
int[] res = new int[n + 1];
for (int i = 0; i < n; i++) {
res[i + 1] = nextInt();
}
return res;
}
public long[] nextLongArray(int n) {
long[] res = new long[n];
for (int i = 0; i < n; i++) {
res[i] = nextLong();
}
return res;
}
public long[] nextLongArrayDec(int n) {
long[] res = new long[n];
for (int i = 0; i < n; i++) {
res[i] = nextLong() - 1;
}
return res;
}
public long[] nextLongArray1Index(int n) {
long[] res = new long[n + 1];
for (int i = 0; i < n; i++) {
res[i + 1] = nextLong();
}
return res;
}
public double[] nextDoubleArray(int n) {
double[] res = new double[n];
for (int i = 0; i < n; i++) {
res[i] = nextDouble();
}
return res;
}
}
}
/* end Main */