結果

問題 No.87 Advent Calendar Problem
ユーザー uafr_csuafr_cs
提出日時 2015-08-17 03:30:29
言語 Java21
(openjdk 21)
結果
AC  
実行時間 196 ms / 5,000 ms
コード長 4,469 bytes
コンパイル時間 2,812 ms
コンパイル使用メモリ 76,228 KB
実行使用メモリ 56,136 KB
最終ジャッジ日時 2023-09-25 12:31:24
合計ジャッジ時間 8,940 ms
ジャッジサーバーID
（参考情報） 		judge15 / judge12
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 181 ms
55,484 KB
testcase_01 AC 189 ms
56,136 KB
testcase_02 AC 180 ms
55,756 KB
testcase_03 AC 175 ms
55,804 KB
testcase_04 AC 177 ms
55,704 KB
testcase_05 AC 175 ms
55,756 KB
testcase_06 AC 182 ms
55,952 KB
testcase_07 AC 187 ms
55,656 KB
testcase_08 AC 181 ms
55,872 KB
testcase_09 AC 183 ms
55,796 KB
testcase_10 AC 183 ms
55,796 KB
testcase_11 AC 188 ms
56,136 KB
testcase_12 AC 194 ms
55,736 KB
testcase_13 AC 194 ms
55,956 KB
testcase_14 AC 192 ms
55,680 KB
testcase_15 AC 183 ms
55,504 KB
testcase_16 AC 175 ms
55,884 KB
testcase_17 AC 184 ms
55,804 KB
testcase_18 AC 177 ms
55,852 KB
testcase_19 AC 175 ms
55,728 KB
testcase_20 AC 181 ms
55,660 KB
testcase_21 AC 180 ms
55,740 KB
testcase_22 AC 182 ms
55,740 KB
testcase_23 AC 178 ms
55,492 KB
testcase_24 AC 178 ms
55,524 KB
testcase_25 AC 179 ms
56,048 KB
testcase_26 AC 196 ms
56,120 KB
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ソースコード

diff # 

import java.util.Scanner;

public class Main {
	
	public static long simulate_count(final long begin, final long end, final int init_days, final int correct){
		int days = init_days;
		long count = 0;
		
		for(long year = begin; year < end; year++){
			if(year % 400 == 0){
				days += 2;
			}else if(year % 100 == 0){
				days += 1;
			}else if(year % 4 == 0){
				days += 2;
			}else{
				days += 1;
			}
			
			days %= 7;
			
			if(days == correct){ count++; }
		}
		
		return count;
	}
	
	public static int simulate_days(final long begin, final long end, final int init_days, final int correct){
		int days = init_days;
		
		for(long year = begin; year < end; year++){
			if(year % 400 == 0){
				days += 2;
			}else if(year % 100 == 0){
				days += 1;
			}else if(year % 4 == 0){
				days += 2;
			}else{
				days += 1;
			}
			
			days %= 7;
		}
		
		return days;
	}
	
	public static boolean is_leap(long year){
		if(year % 400 == 0){
			return true;
		}else if(year % 100 == 0){
			return false;
		}else if(year % 4 == 0){
			return true;
		}else{
			return false;
		}
	}
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong();
		final int DAYS = 7;
		
		final int correct_days = 3;
		int days = 3;
		
		int[] numbered = {1, 4, 100, 400, 100000};
		long[][][] counts = new long[2][numbered.length][DAYS];
		int[][][] next_days = new int[2][numbered.length][DAYS];
		boolean[][][] memoized = new boolean[2][numbered.length][DAYS];
		
		for(int i = 0; i < numbered.length; i++){
			for(int j = 0; j < DAYS; j++){
				memoized[0][i][j] = memoized[1][i][j] = true;
				counts[0][i][j] = simulate_count(2100, 2100 + numbered[i], j, correct_days);
				counts[1][i][j] = simulate_count(2000, 2000 + numbered[i], j, correct_days);
				next_days[0][i][j] = simulate_days(2100, 2100 + numbered[i], j, correct_days);
				next_days[1][i][j] = simulate_days(2000, 2000 + numbered[i], j, correct_days);
			}
		}
		
		long answer = 0;
		for(long year = 2015; year <= N; ){
			final boolean is_leap = is_leap(year);
			//System.out.println(year + " " + answer);
			
			if(year % 100000 == 0 && (year + 100000) <= N){
				if(!memoized[is_leap ? 1 : 0][4][days]){
					memoized[is_leap ? 1 : 0][4][days] = true;
					counts[is_leap ? 1 : 0][4][days] = simulate_count(year, year + 100000, days, correct_days);
					next_days[is_leap ? 1 : 0][4][days] = simulate_days(year, year + 100000, days, correct_days);
				}	
				answer += counts[is_leap ? 1 : 0][4][days];
				days = next_days[is_leap ? 1 : 0][4][days];
				year += 100000;
				
			}else if(year % 400 == 0 && (year + 400) <= N){
				if(!memoized[is_leap ? 1 : 0][3][days]){
					memoized[is_leap ? 1 : 0][3][days] = true;
					counts[is_leap ? 1 : 0][3][days] = simulate_count(year, year + 400, days, correct_days);
					next_days[is_leap ? 1 : 0][3][days] = simulate_days(year, year + 400, days, correct_days);
				}	
				answer += counts[is_leap ? 1 : 0][3][days];
				days = next_days[is_leap ? 1 : 0][3][days];
				year += 400;
				
			}else if(year % 100 == 0 && (year + 100) <= N){
				if(!memoized[is_leap ? 1 : 0][2][days]){
					memoized[is_leap ? 1 : 0][2][days] = true;
					System.out.println(is_leap  + " "  + 2 + " " + year);
					counts[is_leap ? 1 : 0][2][days] = simulate_count(year, year + 100, days, correct_days);
					next_days[is_leap ? 1 : 0][2][days] = simulate_days(year, year + 100, days, correct_days);
				}	
				answer += counts[is_leap ? 1 : 0][2][days];
				days = next_days[is_leap ? 1 : 0][2][days];
				year += 100;
				
			}else if(year % 4 == 0 && (year + 4) <= N){
				if(!memoized[is_leap ? 1 : 0][1][days]){
					memoized[is_leap ? 1 : 0][1][days] = true;
					counts[is_leap ? 1 : 0][1][days] = simulate_count(year, year + 4, days, correct_days);
					next_days[is_leap ? 1 : 0][1][days] = simulate_days(year, year + 4, days, correct_days);
				}	
				answer += counts[is_leap ? 1 : 0][1][days];
				days = next_days[is_leap ? 1 : 0][1][days];
				year += 4;
				
			}else{
				if(!memoized[is_leap ? 1 : 0][0][days]){
					memoized[is_leap ? 1 : 0][0][days] = true;
					counts[is_leap ? 1 : 0][0][days] = simulate_count(year, year + 1, days, correct_days);
					next_days[is_leap ? 1 : 0][0][days] = simulate_days(year, year + 1, days, correct_days);
				}	
				answer += counts[is_leap ? 1 : 0][0][days];
				days = next_days[is_leap ? 1 : 0][0][days];
				year += 1;
			}		
		}
		
		System.out.println(answer);
	}
	
}
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