KMP板子

P3426

#include <cstdio>
#include <cstring>
#include <vector>
#define sd std::
namespace m{ // }
constexpr int LEN = 1e6;
sd vector<int> prepare(char* a){
	int len = strlen(a);
	sd vector<int> ret(len);
	for(int i=1; a[i]; ++i){
		int j = ret[i-1];
		while(j && a[i] != a[j]) j = ret[j-1];
		if(a[i] == a[j]) ++j;
		ret[i] = j;
	}
	return ret;
}
char s1[LEN+1], s2[LEN+1];
void work(){
	scanf("%s%s", s1, s2);
	auto pi = prepare(s2);
	int len2 = strlen(s2);
	int j = 0;
	for(int i=0; s1[i]; ++i){
		while(j && s1[i] != s2[j]) j = pi[j-1];
		if(s1[i] == s2[j]) ++j;
		if(j == len2) printf("%d\n", i-len2+2), j = pi[j-1];
	}
	for(int i:pi){
		printf("%d ", i);
	}
}
} int main(){m::work(); return 0;}