delete pics to save space

history_source/信息学奥赛一本通/2.5.9.cpp

@@ -0,0 +1,173 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+char input[21][25],str[500],st;
+char answer[100][25];
+int n,res;
+int lenof[21];
+int times[21],t2[21];
+#ifdef DEBUG
+FILE *fout=fopen("result.txt","w");
+void sync()
+{
+	fflush(stdout);
+	fflush(fout);
+}
+#endif
+bool equal(char* s1,char* s2,int len)
+{
+#ifdef DEBUG
+	fprintf(fout,"\nin fuction equal: s1=%s s2=%s len=%d\n",s1,s2,len);
+	sync();
+#endif
+	for(int i=0;i<len;i++)
+		if(s1[i]!=s2[i])
+		{
+#ifdef DEBUG
+			fprintf(fout,"\t%c!=%c i=%d\n\n",s1[i],s2[i],i);
+			sync();
+#endif
+			return 0;
+		}
+#ifdef DEBUG
+	fprintf(fout,"\tequal!\n\n");
+	sync();
+#endif
+	return 1;
+}
+void dfs(int dep,int len)
+{
+#ifdef DEBUG
+	fprintf(fout,"dep=%d str=%s len=%d\n",dep,str,len);
+	sync();
+		if(len>res)
+		{
+			printf("updated! now res=%d\n",len);
+			printf("\t%s=%s",str,answer[0]);
+			for(int i=1;i<dep;i++) printf("+%s",answer[i]);
+			printf("\n\n");
+			sync();
+			
+			fprintf(fout,"\t\t\t\t\t\t\t\t\t\tupdated! now res=%d\n",len);
+			fprintf(fout,"\t%s=%s",str,answer[0]);
+			for(int i=1;i<dep;i++) fprintf(fout,"+%s",answer[i]);
+			fprintf(fout,"\n\n");
+			sync();
+		}
+#endif
+	res=max(res,len);
+//	if(dep>=n*2) return;
+	int i,j,k,maxlen,catlen,tl;
+	for(i=0;i<n;i++)
+	{
+		if(t2[i]==0) continue;
+#ifdef DEBUG
+		fprintf(fout,"\ti=%d\n",i);
+		sync();
+		fprintf(fout,"\t\ttry to cat the string!\n");
+		sync();
+#endif
+		maxlen=min(len,lenof[i]);
+		catlen=k=0;
+#ifdef DEBUG
+		fprintf(fout,"\t\tmaxlen=%d k=%d\n",maxlen,k);
+		sync();
+#endif
+		while(k<maxlen)
+		{
+#ifdef DEBUG
+			fprintf(fout,"\t\t\tk=%d\n",k);
+			fprintf(fout,"\t\t\tcall equal in place 1!\n");
+			sync();
+#endif
+			if(!equal(str+len-k,input[i],k))
+			{
+#ifdef DEBUG
+				fprintf(fout,"\t\t\t\tbreak in place 1!\n");
+				sync();
+#endif
+				k++;
+				continue;
+			}
+			catlen=k++;
+		}
+#ifdef DEBUG
+		fprintf(fout,"\t\tcall equal in place 2!\n");
+		sync();
+#endif
+		if(equal(str+len-maxlen,input[i],maxlen)) goto addr1;
+#ifdef DEBUG
+		fprintf(fout,"\t\tcat the %s after %s catlen=%d\n",input[i],str,catlen);
+		sync();
+#endif
+		strcpy(str+len-catlen,input[i]);
+		strcpy(answer[dep],input[i]);
+		tl=len+lenof[i]-catlen;
+		memset(times,0,sizeof(times));
+#ifdef DEBUG
+		fprintf(fout,"\t\tchecking the string before!\n");
+		sync();
+#endif
+		for(j=0;j<n;j++)
+			for(k=0;k+lenof[j]<=tl;k++)
+			{
+#ifdef DEBUG
+				fprintf(fout,"\t\tcall equal in place 3!\n");
+				sync();
+#endif
+				if(equal(str+k,input[j],lenof[j]))
+				{
+					times[j]++;
+					if(times[j]>2) goto addr1;
+				}
+			}
+		t2[i]--;
+		dfs(dep+1,tl);
+		t2[i]++;
+addr1:
+		continue;
+	}
+}
+int main()
+{
+	scanf("%d",&n);
+	for(int i=0;i<n;i++)
+	{
+		scanf("%s",input[i]);
+		lenof[i]=strlen(input[i]);
+		t2[i]=2;
+	}
+	getchar();
+	scanf("%c",&st);
+#ifdef DEBUG
+	printf("n=%d st=%c\n",n,st);
+	for(int i=0;i<n;i++) printf("%s\n",input[i]);
+	sync();
+#endif
+	for(int i=0;i<n;i++)
+		if(input[i][0]==st)
+		{
+			strcpy(str,input[i]);
+			strcpy(answer[0],input[i]);
+			t2[i]--;
+			dfs(1,lenof[i]);
+			t2[i]++;
+		}
+	printf("%d\n",res);
+	return 0;
+}
+/*
+5
+at
+touch
+cheat
+choose
+tact
+a
+
+atoucheatactactouchoose
+at touch cheat tact touch choose
+
+atcheatchoosetouchtactchoosetouchtact=at+cheat+choose+touch+tact+choose+touch+tact
+*/