BF錛圔rute Force錛夌畻娉曟牳蹇冩濇兂鏄細棣栧厛S[1]鍜孴[1]姣旇緝錛岃嫢鐩哥瓑錛屽垯鍐嶆瘮杈僑[2]鍜孴[2]錛屼竴鐩村埌T[M]涓烘錛涜嫢S[1]鍜孴[1]涓嶇瓑錛屽垯T鍚?鍙崇Щ鍔ㄤ竴涓瓧絎︾殑浣嶇疆錛屽啀渚濇榪涜姣旇緝銆傚鏋滃瓨鍦╧錛?≤k≤N錛屼笖S[k+1…k+M]=T[1…M]錛屽垯鍖歸厤鎴愬姛錛涘惁鍒欏け璐ャ傝綆楁硶鏈鍧忔儏鍐典笅瑕佽繘琛?M*(N-M+1)嬈℃瘮杈冿紝鏃墮棿澶嶆潅搴?/a>涓篛(M*N)
姣斿: String a ="123456789" String b= "23"
鍏跺疄灝辨槸寰幆 a涓涓竴涓瓧絎﹀尮閰嶏紝寮濮媋[0]鍜宐[0]鍖歸厤錛屾病鏈夋壘鍒幫紝鐩存帴涓嶇敤鎵綽[1]錛岀洿鎺ョ敤a[1]鍜宐[0]鍖歸厤鍙戠幇宸茬粡 鎵懼埌錛岀劧鍚庣戶緇敤
鍏跺疄灝辨槸寰幆 a涓涓竴涓瓧絎﹀尮閰嶏紝寮濮媋[0]鍜宐[0]鍖歸厤錛屾病鏈夋壘鍒幫紝鐩存帴涓嶇敤鎵綽[1]錛岀洿鎺ョ敤a[1]鍜宐[0]鍖歸厤鍙戠幇宸茬粡 鎵懼埌錛岀劧鍚庣戶緇敤
a[2]鍜宐[1]鍖歸厤鍙戠幇宸茬粡 鎵懼埌銆傚墠涓旀槸b瀛楃涓叉湯灝俱傝鏄庡凡緇忓畬鍏ㄦ壘鍒般傝繑鍥炵粨鏋?br /> JAVA浠ｇ爜瀹炵幇
/**
* 鍖歸厤瀛楃涓詫紝鍒ゆ柇 b瀛楃涓插湪a鍑虹幇鐨勮搗濮嬩綅緗紝娌℃湁鎵懼埌榪斿洖錛?1錛?br /> * @param a
* @param b
* @return
*/
public static int indexOf(String a,String b){
char[] as = a.toCharArray();
char[] bs = b.toCharArray();
int begin = 0;
for(int i = 0 ; i <as.length; i++){
int k = nextStr(as[i], bs,begin);
//璇存槑宸茬粡鎵懼埌
if( k == begin ){
return i-begin;
}
//璇存槑鎵懼埌涓涓瓧絎︼紝闇瑕佺戶緇壘
else if( k >= 0 ){
begin = k;
}else{
//娌℃湁鎵懼埌緇х畫鎵?nbsp;
begin = 0;
}
}
return -1;
}
/**
* 鍖歸厤瀛楃涓詫紝鎵懼埌瀛楃涓蹭綅緗?br /> * @param c
* @param cs
* @param begin
* @return
*/
public static int nextStr(char c,char[] cs,int begin){
//濡傛灉瀛楃鍖歸厤鍜屽凡緇忓埌浜嗗瓧絎﹀熬閮ㄩ潚紺哄凡緇忓叏閮ㄥ尮閰?br /> if(cs[begin] == c && begin == (cs.length-1) ){
return begin;
//濡傛灉瀛楃鍖歸厤浣嗘病鏈夊埌灝鵑儴闇瑕佺戶緇笅縐?br /> }else if(cs[begin] == c){
return begin+1;
}
//瀹屽叏娌℃湁鍖歸厤
else{
return -1;
}
}
鐒跺悗鍦╩ain閲岄潰璋冪敤indexOf鏂規硶鐪嬪埌緇撴灉
* 鍖歸厤瀛楃涓詫紝鍒ゆ柇 b瀛楃涓插湪a鍑虹幇鐨勮搗濮嬩綅緗紝娌℃湁鎵懼埌榪斿洖錛?1錛?br /> * @param a
* @param b
* @return
*/
public static int indexOf(String a,String b){
char[] as = a.toCharArray();
char[] bs = b.toCharArray();
int begin = 0;
for(int i = 0 ; i <as.length; i++){
int k = nextStr(as[i], bs,begin);
//璇存槑宸茬粡鎵懼埌
if( k == begin ){
return i-begin;
}
//璇存槑鎵懼埌涓涓瓧絎︼紝闇瑕佺戶緇壘
else if( k >= 0 ){
begin = k;
}else{
//娌℃湁鎵懼埌緇х畫鎵?nbsp;
begin = 0;
}
}
return -1;
}
/**
* 鍖歸厤瀛楃涓詫紝鎵懼埌瀛楃涓蹭綅緗?br /> * @param c
* @param cs
* @param begin
* @return
*/
public static int nextStr(char c,char[] cs,int begin){
//濡傛灉瀛楃鍖歸厤鍜屽凡緇忓埌浜嗗瓧絎﹀熬閮ㄩ潚紺哄凡緇忓叏閮ㄥ尮閰?br /> if(cs[begin] == c && begin == (cs.length-1) ){
return begin;
//濡傛灉瀛楃鍖歸厤浣嗘病鏈夊埌灝鵑儴闇瑕佺戶緇笅縐?br /> }else if(cs[begin] == c){
return begin+1;
}
//瀹屽叏娌℃湁鍖歸厤
else{
return -1;
}
}
鐒跺悗鍦╩ain閲岄潰璋冪敤indexOf鏂規硶鐪嬪埌緇撴灉
]]>
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