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October 5, 2022 11:39
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import java.time.Instant; | |
import static java.time.temporal.ChronoUnit.*; | |
class Domingos { | |
public static void main(String... args) { | |
Instant x1 = Instant.now(); | |
int deltaMes[] = { | |
31, // jan 1 | |
28, // fev 1 | |
31, // mar 1 | |
30, // abr 1 | |
31, // mai 1 | |
30, // jun 1 | |
31, // jul 1 | |
31, // ago 1 | |
30, // set 1 | |
31, // out 1 | |
30, // nov 1 | |
31, // dez 1 | |
31, // jan 2 | |
28, // fev 2 | |
31, // mar 2 | |
30, // abr 2 | |
31, // mai 2 | |
30, // jun 2 | |
31, // jul 2 | |
31, // ago 2 | |
30, // set 2 | |
31, // out 2 | |
30, // nov 2 | |
31, // dez 2 | |
31, // jan 3 | |
28, // fev 3 | |
31, // mar 3 | |
30, // abr 3 | |
31, // mai 3 | |
30, // jun 3 | |
31, // jul 3 | |
31, // ago 3 | |
30, // set 3 | |
31, // out 3 | |
30, // nov 3 | |
31, // dez 3 | |
31, // jan 4 | |
29, // fev 4 | |
31, // mar 4 | |
30, // abr 4 | |
31, // mai 4 | |
30, // jun 4 | |
31, // jul 4 | |
31, // ago 4 | |
30, // set 4 | |
31, // out 4 | |
30, // nov 4 | |
31, // dez 4 | |
}; | |
for (int i = 0; i < deltaMes.length; i++) { | |
deltaMes[i] = deltaMes[i] % 7; | |
} | |
int diaSemanaAtual = 2; // terça-feira, 01, jan, 1901 | |
int domingosPrimeiro = 0; // qnt de dias primeiro que são domingo | |
for (int i = 0; i < 100*12 /* 100 anos, thus 100 12 meses */; i++) { | |
if (diaSemanaAtual == 0) { | |
domingosPrimeiro++; | |
} | |
final int delta = deltaMes[i % deltaMes.length]; | |
diaSemanaAtual = (diaSemanaAtual + delta) % 7; | |
} | |
Instant x2 = Instant.now(); | |
System.out.println(domingosPrimeiro); | |
System.out.print(x1.until(x2, MILLIS)); | |
} | |
} |
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