HDU 1358 KMP
#include <cstdio> #include <cstdlib> #include <cstring> #include <cmath> #include <cctype> #include <vector> #include <stack> #include <queue> #include <map> #include <algorithm> #include <iostream> #include <string> #include <set> #define X first #define Y second #define sqr(x) (x)*(x) #pragma comment(linker,"/STACK:102400000,102400000") using namespace std; const double PI = acos(-1.0); map<int, int>::iterator it; typedef long long LL ; template<typename T> void checkmin(T &x, T y) {x = min(x, y);} template<typename T> void checkmax(T &x, T y) {x = max(x, y);} const int N = 1000005; int p[N]; int KMP(char *a, int n, char *b, int m) { p[0] = -1; int i, j = -1; for(i = 1; i <= m; i++) { while((j > -1) && (b[j+1] != b[i])) j = p[j]; if(b[j+1] == b[i]) j++; p[i] = j; } //for(i=0;i<m;i++) printf("%d ",p[i]); printf("\n"); j = -1; for(i = 0; i < n; i++) { while((j > -1) && (b[j+1] != a[i])) j = p[j]; if(b[j+1] == a[i]) { j++; } if(j == m - 1) { //printf("i=%d\n",i); //return i-m+1; j = p[j]; } } return -1; } char s[N]; int main() { int n; int T = 0; while(~scanf("%d", &n), n) { scanf("%s", s); KMP(s,n,s,n); printf("Test case #%d\n",++T); for(int i=0;i<n;++i) { int len = i - p[i]; if( (i+1)%len==0&&(i+1)/len>=2 ) { printf("%d %d\n",i+1,(i+1)/len); } } puts(""); /* for(int i = 0; i < n; ++i) { printf("%3c", s[i]); } puts(""); for(int i = 0; i < n; ++i) { printf("%3d", p[i]); } puts(""); */ } return 0; }