阿里云超级码力第四场-闰年

代码写的比较丑，就是感觉这题有点意思。如果可以判断第二年是闰年，前一年一定是平年。

int day_diff(int year_start, int month_start, int day_start
			, int year_end, int month_end, int day_end)
{
	int y2, m2, d2;
	int y1, m1, d1;
	
	m1 = (month_start + 9) % 12;
	y1 = year_start - m1/10;
	d1 = 365*y1 + y1/4 - y1/100 + y1/400 + (m1*306 + 5)/10 + (day_start - 1);
 
	m2 = (month_end + 9) % 12;
	y2 = year_end - m2/10;
	d2 = 365*y2 + y2/4 - y2/100 + y2/400 + (m2*306 + 5)/10 + (day_end - 1);
	
	return (d2 - d1);
}
  string guessYear(vector<vector<int> > &inputQueries) {
        // write your code here
        string ans="";
        for(int i=0;i<inputQueries.size();i++){
        	
        	int m1=inputQueries[i][0];int d1=inputQueries[i][1];
        	int m2=inputQueries[i][2];int d2=inputQueries[i][3];
        	int x=inputQueries[i][4];
        	if(m1==2&&d1==29){
        		ans+="R";
        		continue;
			}
        	
        	if(m1<m2){//一年之中 
        		if(m2==2&&d2==29){
        		ans+="R";
        		continue;
			    }
        		if(m1>2||m2<=2){
        			ans+="?";
        		    continue;
				}
				if(day_diff(2016,m1,d1,2016,m2,d2)==x){
					ans+="R";
        		    continue;
				}
				else{
					ans+="P";
        		    continue;
				}
				
			}
			else if(m1==m2&&d1<=d2){//一年之中 
				if(m2==2&&d2==29){
        			ans+="R";
        			continue;
			    }
			    else{
			    	ans+="?";
        			continue;
				}
			}
			else {//非一年之内 
			if(m2==2&&d2==29){
				ans+="P";
        		continue;
			}
			   if(m1<=2){
				if(day_diff(2016,m1,d1,2017,m2,d2)==x){
					ans+="R";
        		    continue;
				}
				else{
					ans+="P";
        		    continue;
				}
			}
			if(m2>2){
			  if(day_diff(2015,m1,d1,2016,m2,d2)==x){
					ans+="P";
        		    continue;
				}
			}
			ans+="?";
            continue; 
			}	
		}
		return ans;
    }