116 lines
2.9 KiB
C++
116 lines
2.9 KiB
C++
#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <cmath>
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#include <cassert>
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#include <iostream>
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#include <sstream>
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#include <fstream>
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#include <map>
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#include <set>
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#include <vector>
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#include <queue>
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#include <algorithm>
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#include <iomanip>
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#define inf 0x3f3f3f3f
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#define maxn 1005
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using namespace std;
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struct node
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{
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int mm,dd,hh,MM;
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} ttt[maxn];
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char str[1005];
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int f[maxn][maxn],t[maxn],n;
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bool flag[maxn];
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int cmp(node t1,node t2) //t1<t2 -1; t1==t2 0; t1>t2 1;
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{
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if(t1.mm!=t2.mm)
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{
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if(t1.mm<t2.mm) return -1;
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else return 1;
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}
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if(t1.dd!=t2.dd)
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{
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if(t1.dd<t2.dd) return -1;
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else return 1;
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}
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if(t1.hh!=t2.hh)
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{
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if(t1.hh<t2.hh) return -1;
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else return 1;
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}
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if(t1.MM!=t2.MM)
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{
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if(t1.MM<t2.MM) return -1;
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else return 1;
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}
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return 0;
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}
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int main()
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{
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char op;
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while(scanf("%d",&n)!=EOF&&n!=0)
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{
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memset(flag,0,sizeof(flag));
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for(int i=n; i>=1; i--)
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{
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scanf("%d:%d:%d:%d %s %c",&ttt[i].mm,&ttt[i].dd,&ttt[i].hh,&ttt[i].MM,str,&op);
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if(op=='+') flag[i]=1;
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}
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t[1]=0;
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for(int i=2; i<=n; i++)
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{
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t[i]=t[i-1];
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if(cmp(ttt[i],ttt[i-1])>=0 ) t[i]++;
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}
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f[1][1]=1;
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if(flag[1]) f[1][0]=inf;
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else f[1][0]=0;
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for(int i=2; i<=n; i++) f[1][i]=inf;
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for(int i=2; i<=n; i++)
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{
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for(int j=1; j<=n; j++) f[i][j]=inf;
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if(!flag[i]) f[i][0]=f[i-1][0];
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else f[i][0]=inf;
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if(flag[i])
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{
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if(t[i]==0) f[i][i]=min(f[i][i],f[i-1][0]+1);
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for(int j=1; j<i; j++)
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if(f[i-1][j]<inf)
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{
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int tt;
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tt=t[i];
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if(cmp(ttt[i],ttt[j])>=0) tt--;
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if(tt==t[j]) //zhengque queding nianfen
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{
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f[i][i]=min(f[i-1][j]+1,f[i][i]);
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}
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}
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}
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else
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{
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for(int j=1; j<=n; j++) f[i][j]=min(f[i][j],f[i-1][j]);
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if(t[i]==0) f[i][i]=min(f[i][i],f[i-1][0]+1);
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for(int j=1; j<i; j++)
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if(f[i-1][j]<inf)
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{
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int tt;
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tt=t[i];
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if(cmp(ttt[i],ttt[j])>=0) tt--;
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if(tt==t[j]) //zhengque queding nianfen
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{
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f[i][i]=min(f[i-1][j]+1,f[i][i]);
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}
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}
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}
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}
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int res;
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res=inf;
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for(int i=1; i<=n; i++)
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res=min(res,f[n][i]);
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res=min(res,n);
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printf("%d\n",res);
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}
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return 0;
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}
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