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USACO 1.2.3_friday

/*
ID: cjn77881
LANG: C
TASK: friday
*/

#include <stdio.h>

int N,dow;
int dpm[12]={31,28,31,30,31,30,31,31,30,31,30,31};
int js[7];

int isleap(int y){ //判斷是否閏年,是返回1,否返回0 
	return (y%4 == 0) && (y%100 != 0) || (y%400 == 0);
}

int main(){
	
	FILE *fin = fopen("friday.in","r");
	FILE *fout = fopen("friday.out"
,"w"); fscanf(fin,"%d",&N); dow = 6; //1900年第一個月的13號是星期六 for (int i=1900;i<1900+N;i++){ for (int j=0;j<12;j++){ js[dow]++; dow += dpm[j]; if (j == 1) dow += isleap(i); dow %= 7; } } fprintf(fout,"%d ",js[6]); for (int i=0;i<6;i++) { fprintf(fout,"%d",js[i]); if (
i != 5) fprintf(fout," "); //這種輸出方法值得使用 else fprintf(fout,"\n"); } return 0; }