結果

問題 No.1909 Detect from Substrings
コンテスト
ユーザー tails
提出日時 2022-04-22 23:04:21
言語 C
(gcc 13.3.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 1,467 bytes
コンパイル時間 314 ms
コンパイル使用メモリ 30,976 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-06-24 04:27:01
合計ジャッジ時間 1,817 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
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ファイルパターン 結果
sample AC * 3
other AC * 36
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.c: In function 'main':
main.c:57:17: warning: implicit declaration of function 'memcpy' [-Wimplicit-function-declaration]
   57 |                 memcpy(t+(j+1),s2+j,m-j);
      |                 ^~~~~~
main.c:1:1: note: include '<string.h>' or provide a declaration of 'memcpy'
  +++ |+#include <string.h>
    1 | #pragma GCC optimize("Ofast")
main.c:57:17: warning: incompatible implicit declaration of built-in function 'memcpy' [-Wbuiltin-declaration-mismatch]
   57 |                 memcpy(t+(j+1),s2+j,m-j);
      |                 ^~~~~~
main.c:57:17: note: include '<string.h>' or provide a declaration of 'memcpy'
main.c:62:17: warning: implicit declaration of function 'write' [-Wimplicit-function-declaration]
   62 |                 write(1,&r,1);
      |                 ^~~~~
main.c:89:28: warning: implicit declaration of function 'memcmp' [-Wimplicit-function-declaration]
   89 |                         r+=memcmp(s1+j,s2+(j+1),k-j)==0;
      |                            ^~~~~~
main.c:89:28: note: include '<string.h>' or provide a declaration of 'memcmp'
main.c:89:50: warning: 'memcmp' argument 3 type is 'long int' where 'long unsigned int' is expected in a call to built-in function declared without prototype [-Wbuiltin-declaration-mismatch]
   89 |                         r+=memcmp(s1+j,s2+(j+1),k-j)==0;
      |                                                 ~^~
<built-in>: note: built-in 'memcmp' declared here
main.c:90:50: warning: 'memcmp' argument 3 type is 'long int' where 'long unsigned int' is expected in a call to built-in function declared without prototype [-Wbuiltin-declaration-mismatch]
   90 |                         r+=memcmp(s1+(j+1),s2+j,k-j)==0;
      |                                                 ~^~
<built-in>: note: built-in 'memcmp' declared here
main.c:94:9: warning: implicit declaration of function '_exit'; did you mean '_Exit'? [-Wimplicit-function-declaration]
   94 |         _exit(0);
      |         ^~~~~
      |         _Exi

ソースコード

diff # 

#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_skip() while(*rp++>=48)
#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})

char t[500004];

long f(char*s){
	while(*s){
		char*u=t;
		while(*(long*)s==*(long*)u){
			s+=sizeof(long);
			u+=sizeof(long);
		}
		while(*s==*u){
			++s;
			++u;
		}
		++u;
		while(*(long*)s==*(long*)u){
			s+=sizeof(long);
			u+=sizeof(long);
		}
		while(*s==*u){
			++s;
			++u;
		}
		if(*s++!=10){
			return 0;
		}
	}
	return 1;
}

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd_skip();
	long m=rd();
	if(rp[m*2+2]){
		// case: n != 2
		long j=0;
		char*s1=rp;
		char*s2=rp+(m+1);
		long v;
		while(v=*(long*)(s1+j),v==*(long*)(s2+j)){
			*(long*)(t+j)=v;
			j+=sizeof(long);
		}
		while(s1[j]==s2[j]){
			t[j]=s1[j];
			++j;
		}
		long r=48;
		t[j]=s1[j];
		memcpy(t+(j+1),s2+j,m-j);
		r+=f(rp);
		t[j]=s2[j];
		memcpy(t+(j+1),s1+j,m-j);
		r+=f(rp);
		write(1,&r,1);
	}
	else{
		// case: n == 2
		long j=0,k=m-1;
		char*s1=rp;
		char*s2=rp+(m+1);
		while(*(long*)(s1+j)==*(long*)(s2+j)){
			j+=sizeof(long);
		}
		while(s1[j]==s2[j]){
			++j;
		}
		if(m>=sizeof(long)){
			while(*(long*)(s1+(k-(sizeof(long)-1)))==*(long*)(s2+(k-(sizeof(long)-1)))){
				k-=sizeof(long);
			}
		}
		while(s1[k]==s2[k]){
			--k;
		}
		long r;
		if(j==k){
			r='2';
		}
		else{
			r=48;
			r+=memcmp(s1+j,s2+(j+1),k-j)==0;
			r+=memcmp(s1+(j+1),s2+j,k-j)==0;
		}
		write(1,&r,1);
	}
	_exit(0);
}
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