題目要求

P1867題目鏈接

分析

先解決2ⁿ的數(shù)值問題，就打表吧……

寫個(gè)打表程序，覆蓋long的數(shù)值范圍：

public class Pow {public static void main(String[] args) {for (long i = 0; i <= 63; i++) {System.out.print((long)Math.pow(2, i) + "L,");}} }

之所以寫L，是因?yàn)槠胀〝?shù)值默認(rèn)int，加L表示是long，好管理……

先看看經(jīng)驗(yàn)收益有多少。
能收獲多少注意生命，生命大于0才有效……
注意一個(gè)問題：生命不能大于10，我開始WA了一次就是沒注意這個(gè)問題，悲催……

算出收益以后就從小到大消耗經(jīng)驗(yàn)就好了，能到哪步就到哪步，Fine……

AC代碼

import java.util.Scanner;public class Main {public static void main(String[] args) {long[] pow_array = new long[] {1L,2L,4L,8L,16L,32L,64L,128L,256L,512L,1024L,2048L,4096L,8192L,16384L,32768L,65536L,131072L,262144L,524288L,1048576L,2097152L,4194304L,8388608L,16777216L,33554432L,67108864L,134217728L,268435456L,536870912L,1073741824L,2147483648L,4294967296L,8589934592L,17179869184L,34359738368L,68719476736L,137438953472L,274877906944L,549755813888L,1099511627776L,2199023255552L,4398046511104L,8796093022208L,17592186044416L,35184372088832L,70368744177664L,140737488355328L,281474976710656L,562949953421312L,1125899906842624L,2251799813685248L,4503599627370496L,9007199254740992L,18014398509481984L,36028797018963968L,72057594037927936L,144115188075855872L,288230376151711744L,576460752303423488L,1152921504606846976L,2305843009213693952L,4611686018427387904L,9223372036854775807L};Scanner scanner = new Scanner(System.in);int num = scanner.nextInt(), level;long exp = 0;double life = 10;for (int i = 0; i < num; i++) {life -= scanner.nextDouble();if (life <= 0) {break;} else if (life > 10) {life = 10;}exp += scanner.nextInt();}scanner.close();for (level = 0; level < pow_array.length; level++) {if (exp < pow_array[level]) {break;}exp -= pow_array[level];}System.out.println(level + " " + exp);} } 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

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