题目

代码

#include<bits/stdc++.h>
using namespace std;
long long f[114514];
int t,n;
void read()
{
	int h,m;
	char tmp[114514];
	cin>>tmp;
	int l=0;
	if(tmp[1]==':')
		h=tmp[0]-'0',l=0;
	else if(tmp[2]==':')
		h=(tmp[0]-'0')*10+tmp[1]-'0',l=1;
	m=(tmp[l+2]-'0')*10+tmp[l+3]-'0';
	l=l+3;
	if(tmp[l+1]=='p'&&h!=12)
		h+=12;
	h-=8;
	f[h*60+m]--;
	l+=4;
	if(tmp[l+1]==':')
		h=tmp[l]-'0',l+=2;
	else if(tmp[l+2]==':')
		h=(tmp[l]-'0')*10+tmp[l+1]-'0',l+=3;
	m=(tmp[l]-'0')*10+tmp[l+1]-'0';
	l+=2;
	if(tmp[l]=='p'&&h!=12)
		h+=12;
	h-=8;
	f[h*60+m]++;		
}
void print(int x)
{
	int h=x/60+8;
	int m=x%60;
	int tmp=h%12;
	if(tmp<10)
		cout<<0;
	if(tmp==0)
		tmp=12;
	cout<<tmp;
	cout<<":";
	if(m<10)
		cout<<0;
	cout<<m;
	if(h<12)
		cout<<"am";
	else
		cout<<"pm";
}
int main()
{
	cin>>t;
	int k=t;
	while(k--)
	{
		cin>>n;
		for(int i=1;i<=n;i++)
		{
			read();
		}
	}
	for(int i=1;i<=13*60;i++)
		f[i]+=f[i-1];
//	for(int i=0;i<=14*60;i++)
//		cout<<f[i]<<" ";
	for(int i=0;i<=13*60;i++)
	{
		if(f[i]==(-t)&&(i==0||f[i-1]!=(-t)))
		{
			print(i);
			cout<<'-';
		}
		if((f[i]!=(-t)&&f[i-1]==(-t))||(i==13*60&&f[i]==(-t)))
		{
			print(i);
			cout<<'\n';
		}
	}
    return 0;
}