#include #define ll long long #define rint register int using namespace std; stack zhan; int main(){ int t;scanf("%d",&t); while(t--){ int n;scanf("%d",&n); int nowline=0,pos=0; int Fcnt=0,Ecnt=0,cnt=0; int hisans=0,myans=0; int runflag=-1; bool endflag=false; string tmp;cin>>tmp; string sublist="0"; for(rint i=0;i='0'&&tmp[i]<='9'){ hisans+=tmp[i]-'0'; hisans*=10; } hisans/=10; if(tmp[2]=='1') hisans=0; for(rint i=1;i<=n;++i){ string sub,opt,tmpsta,tmpend; int sta=0,end=0; cin>>opt; if(opt=="F"){ ++Fcnt;++pos; zhan.push(pos); cin>>sub>>tmpsta>>tmpend; if(tmpend[0]=='n'&& (!(tmpsta[0]=='n'&&tmpend[0]=='n'))) ++cnt; for(rint j=0;jend)//如果循环不能执行 runflag=pos; } if(runflag==-1||pos0) sublist=sublist.substr(0,sublist.length()-1); if(zhan.empty()) cnt=0; } } if(endflag){ cnt=0; while(!zhan.empty()) zhan.pop(); string cnm; for(rint i=1;i<=n-nowline+1;++i) getline(cin,cnm); continue; } if(Fcnt!=Ecnt){ if(!endflag) printf("ERR\n"); while(!zhan.empty()) zhan.pop(); cnt=0; continue; } while(!zhan.empty()) zhan.pop(); if(!endflag){ if(myans==hisans) printf("Yes\n"); else printf("No\n"); } myans=hisans=0; } return 0; }

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1920.[NOIP2017 提高组] 时间复杂度

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