棰樼洰錛氭湁N涓漢錛屽叾涓竴涓槑鏄熷拰n-1涓兢浼楋紝緹や紬閮借璇嗘槑鏄燂紝鏄庢槦涓嶈璇嗕換浣曠兢浼楋紝緹や紬鍜岀兢浼椾箣闂寸殑璁よ瘑鍏崇郴涓嶇煡閬擄紝鐜板湪濡傛灉浣犳槸鏈哄櫒浜篟2T2錛屼綘姣忔闂竴涓漢鏄惁璁よ瘑鍙﹀涓€涓漢鐨勪唬浠蜂負O(1)錛岃瘯璁捐涓€縐嶇畻娉曟壘鍑烘槑鏄燂紝騫剁粰鍑烘椂闂村鏉傚害錛堟病鏈夊鏉傚害涓嶅緱鍒嗭級銆?br />
鎴戠殑瑙ｆ硶( 澶嶆潅搴(n) )錛?br />
// bool known(A, B) 闂瓵璁よ瘑B涓嶏紵
Person persons[n];
// init persons
Person p = persons[0];
for(int i = 1; i < n; i++) {
if(!known(persons[i], p)) { // 涓嶈璇嗭紝璇存槑p涓嶆槸鏄庢槦
p = persons[i];
}
// else 璁よ瘑錛岃鏄巔ersons[i]涓嶆槸鏄庢槦
}
// p 灝辨槸鎵€姹傜殑鏄庢槦
Person persons[n];
// init persons
Person p = persons[0];
for(int i = 1; i < n; i++) {
if(!known(persons[i], p)) { // 涓嶈璇嗭紝璇存槑p涓嶆槸鏄庢槦
p = persons[i];
}
// else 璁よ瘑錛岃鏄巔ersons[i]涓嶆槸鏄庢槦
}
// p 灝辨槸鎵€姹傜殑鏄庢槦
]]>
]]>
/********************************************************************
purpose: 鍦ㄤ簩鍏冩爲涓壘鍑哄拰涓烘煇涓€鍊肩殑鎵€鏈夎礬寰?br /> 棰樼洰錛氳緭鍏ヤ竴涓暣鏁板拰涓€媯典簩鍏冩爲銆?br /> 浠庢爲鐨勬牴緇撶偣寮€濮嬪線涓嬭闂竴鐩村埌鍙剁粨鐐規墍緇忚繃鐨勬墍鏈夌粨鐐瑰艦鎴愪竴鏉¤礬寰勩€?br /> 鎵撳嵃鍑哄拰涓庤緭鍏ユ暣鏁扮浉絳夌殑鎵€鏈夎礬寰勩€?br /> 渚嬪 杈撳叆鏁存暟22鍜屽涓嬩簩鍏冩爲 10 / \ 5 12 / \ 4 7 鍒欐墦鍗板嚭涓ゆ潯璺緞錛?0, 12鍜?0, 5, 7銆?br /> 浜屽厓鏍戣妭鐐圭殑鏁版嵁緇撴瀯瀹氫箟涓猴細 struct BinaryTreeNode // a node in the binary tree { int m_nValue; // value of node BinaryTreeNode *m_pLeft; // left child of node BinaryTreeNode *m_pRight; // right child of node };
*********************************************************************/
#include <iostream>#include <vector>using namespace std;struct BinaryTreeNode // a node in the binary tree{ int m_nValue; // value of node BinaryTreeNode *m_pLeft; // left child of node BinaryTreeNode *m_pRight; // right child of node};void PathEqualN(vector<BinaryTreeNode*> vect, BinaryTreeNode* pNode, int sum, int destSum){ sum += pNode->m_nValue;
if (pNode->m_pLeft == NULL && pNode->m_pRight == NULL) {
if (sum == destSum) { for (int i = 0; i < vect.size(); i++) { cout<<vect[i]->m_nValue<<" ";
} cout<<pNode->m_nValue<<endl; } return; } vect.push_back(pNode); if (pNode->m_pLeft != NULL) { PathEqualN(vect, pNode->m_pLeft, sum, destSum); } if (pNode->m_pRight != NULL) { PathEqualN(vect, pNode->m_pRight, sum, destSum); } vect.pop_back();}void Test_PathEqualN(){ // init tree BinaryTreeNode node4; node4.m_nValue = 4; node4.m_pLeft = NULL; node4.m_pRight = NULL; BinaryTreeNode node7; node7.m_nValue = 7; node7.m_pLeft = NULL; node7.m_pRight = NULL; BinaryTreeNode node5; node5.m_nValue = 5; node5.m_pLeft = &node4; node5.m_pRight = &node7; BinaryTreeNode node12; node12.m_nValue = 12; node12.m_pLeft = NULL; node12.m_pRight = NULL; BinaryTreeNode root; root.m_nValue = 10; root.m_pLeft = &node5; root.m_pRight = &node12; // search vector<BinaryTreeNode*> vect; PathEqualN(vect, &root, 0, 22);}璨屼技閮戒笉鏄お闅撅紝闅鵑亾鏄鑰冭檻緇嗚妭錛燂紵
]]>
/******************************************************************** purpose: 姹傚瓙鏁扮粍鐨勬渶澶у拰/姹傝繛緇瓙鏁扮粍鐨勬渶澶у拰 棰樼洰鎻忚堪錛?br /> 杈撳叆涓€涓暣褰㈡暟緇勶紝鏁扮粍閲屾湁姝ｆ暟涔熸湁璐熸暟銆?br /> 鏁扮粍涓繛緇殑涓€涓垨澶氫釜鏁存暟緇勬垚涓€涓瓙鏁扮粍錛屾瘡涓瓙鏁扮粍閮芥湁涓€涓拰銆?br /> 姹傛墍鏈夊瓙鏁扮粍鐨勫拰鐨勬渶澶у€箋€傝姹傛椂闂村鏉傚害涓篛(n)銆?br /> 渚嬪杈撳叆鐨勬暟緇勪負1, -2, 3, 10, -4, 7, 2, -5錛屽拰鏈€澶х殑瀛愭暟緇勪負3, 10, -4, 7, 2錛?br /> 鍥犳杈撳嚭涓鴻瀛愭暟緇勭殑鍜?8銆?br />*********************************************************************/#include <iostream> using namespace std;int maxSum(int* a, int n) { int sum=0; //鍏跺疄瑕佸鐞嗗叏鏄礋鏁扮殑鎯呭喌錛屽緢綆€鍗曪紝濡傜◢鍚庝笅闈㈢3鐐規墍瑙侊紝鐩存帴鎶婅繖鍙ユ敼鎴愶細"int sum=a[0]"鍗沖彲 //涔熷彲浠ヤ笉鏀癸紝褰撳叏鏄礋鏁扮殑鎯呭喌錛岀洿鎺ヨ繑鍥?錛屼篃涓嶈寰椾笉琛屻€?nbsp; int b=0; for(int i=0; i<n; i++) { if(b<0) // b=a[i]; else b+=a[i]; if(sum<b) sum=b; } return sum; } void Test_MaxSumOfSequenceSubArr(){ int a[10]={1, -2, 3, 10, -4, 7, 2, -5}; //int a[]={-1,-2,-3,-4}; //嫻嬭瘯鍏ㄦ槸璐熸暟鐨勭敤渚?nbsp; cout<<"Max sum: "<<maxSum(a,8)<<endl; }]]>
/******************************************************************** purpose: 璁捐鍖呭惈min鍑芥暟鐨勬爤銆?br /> 瀹氫箟鏍堢殑鏁版嵁緇撴瀯錛岃姹傛坊鍔犱竴涓猰in鍑芥暟錛岃兘澶熷緱鍒版爤鐨勬渶灝忓厓绱犮€?br /> 瑕佹眰鍑芥暟min銆乸ush浠ュ強pop鐨勬椂闂村鏉傚害閮芥槸O(1)銆?br />*********************************************************************/#include <vector> using namespace std;template<class T>class stack{private: T* elements; int count, top; int* minPos;public: stack(int n) { top = 0; count = n; minPos = new int[count]; elements = new T[count]; if (elements == NULL || minPos == NULL) { count = 0; cout<<"no more memory."<<endl; } } void push(T element) { if (top >= count) { cout<<"stack is full."<<endl; } else { if (top <= 0 || element < elements[top-1]) { minPos[top] = top; } else { minPos[top] = minPos[top-1]; } elements[top++] = element; } } T pop() { if (top <= 0) { throw "no element in stack"; } else { return elements[--top]; } } T min() { if (top <= 0) throw "no element in stack"; return elements[minPos[top-1]]; } bool empty() { return top <= 0; } ~stack() { delete[] elements; delete[] minPos; }};void Test_StackWithMinFunc(){ stack<int> st(20); int val[] = {6,7,1,3,9,11}; int len = sizeof(val)/sizeof(val[0]); for (int i = 0; i < len; i++) { st.push(val[i]); cout<<st.min()<<endl; } while(!st.empty()) { cout<<st.min()<<endl; st.pop(); }}]]>
/******************************************************************** created: 2011/05/26 12:13 filename: BSTree2DuLink.h file base: BSTree2DuLink file ext: h author: WT@CHINA purpose: 鎶婁簩鍏冩煡鎵炬爲杞彉鎴愭帓搴忕殑鍙屽悜閾捐〃 棰樼洰錛?br /> 杈撳叆涓€媯典簩鍏冩煡鎵炬爲錛屽皢璇ヤ簩鍏冩煡鎵炬爲杞崲鎴愪竴涓帓搴忕殑鍙屽悜閾捐〃銆?br /> 瑕佹眰涓嶈兘鍒涘緩浠諱綍鏂扮殑緇撶偣錛屽彧璋冩暣鎸囬拡鐨勬寚鍚戙€?br /> 10 / \ 6 14 / \ / \ 4 8 12 16 杞崲鎴愬弻鍚戦摼琛?br /> 4=6=8=10=12=14=16銆?br /> 棣栧厛鎴戜滑瀹氫箟鐨勪簩鍏冩煡鎵炬爲 鑺傜偣鐨勬暟鎹粨鏋勫涓嬶細 struct BSTreeNode { int m_nValue; // value of node BSTreeNode *m_pLeft; // left child of node BSTreeNode *m_pRight; // right child of node };*********************************************************************/#include <iostream>using namespace std;struct BSTreeNode{ int m_nValue; // value of node BSTreeNode *m_pLeft; // left child of node BSTreeNode *m_pRight; // right child of node};void BSTree2DuLink(BSTreeNode* pNode, BSTreeNode* pLeft, BSTreeNode* pRight){ if (pNode->m_pLeft != NULL) { BSTree2DuLink(pNode->m_pLeft, pLeft, pNode); } else { if (pLeft != NULL) { pNode->m_pLeft = pLeft; pLeft->m_pRight = pNode; } } if (pNode->m_pRight != NULL) { BSTree2DuLink(pNode->m_pRight, pNode, pRight); } else { if (pRight != NULL) { pNode->m_pRight = pRight; pRight->m_pLeft = pNode; } }}void Test_BSTree2DuLink(){ // init tree BSTreeNode node4; node4.m_nValue = 4; node4.m_pLeft = NULL; node4.m_pRight = NULL; BSTreeNode node8; node8.m_nValue = 8; node8.m_pLeft = NULL; node8.m_pRight = NULL; BSTreeNode node6; node6.m_nValue = 6; node6.m_pLeft = &node4; node6.m_pRight = &node8; BSTreeNode node12; node12.m_nValue = 12; node12.m_pLeft = NULL; node12.m_pRight = NULL; BSTreeNode node16; node16.m_nValue = 16; node16.m_pLeft = NULL; node16.m_pRight = NULL; BSTreeNode node14; node14.m_nValue = 14; node14.m_pLeft = &node12; node14.m_pRight = &node16; BSTreeNode root; root.m_nValue = 10; root.m_pLeft = &node6; root.m_pRight = &node14; // convert BSTree to DuLink BSTree2DuLink(&root, NULL, NULL); // console out the double link list BSTreeNode* p = &root; while(p->m_pLeft != NULL) p = p->m_pLeft; while(p != NULL) { cout<<p->m_nValue<<" "; p = p->m_pRight; } }]]>
]]>
int dayofweek(int y, int m, int d) /* 0 = Sunday */
{
static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
y -= m < 3;
return (y + y/4 - y/100 + y/400 + t[m-1] + d) % 7;
}
{
static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
y -= m < 3;
return (y + y/4 - y/100 + y/400 + t[m-1] + d) % 7;
}
]]>
register n = (count + 7) / 8; /* count > 0 assumed */
switch (count % 8)
{
case 0: do { *to = *from++;
case 7: *to = *from++;
case 6: *to = *from++;
case 5: *to = *from++;
case 4: *to = *from++;
case 3: *to = *from++;
case 2: *to = *from++;
case 1: *to = *from++;
} while (--n > 0);
}
榪欓噷 count 涓瓧鑺備粠 from 鎸囧悜鐨勬暟緇勫鍒跺埌 to 鎸囧悜鐨勫唴瀛樺湴鍧€ (榪欐槸涓唴瀛樻槧灝勭殑杈撳嚭瀵勫瓨鍣? 榪欎篃鏄負浠€涔堝畠娌℃湁琚鍔?銆傚畠鎶? swtich 璇彞鍜屽鍒?nbsp;8 涓瓧鑺傜殑寰幆浜ょ粐鍦ㄤ竴璧? 浠庤€岃В鍐充簡鍓╀綑瀛楄妭鐨勫鐞嗛棶棰?nbsp;(褰?nbsp;count 涓嶆槸 8 鐨勫€嶆暟鏃?銆傜浉淇′笉鐩鎬俊, 璞¤繖鏍風殑鎶? case 鏍囧織鏀懼湪宓屽鍦?nbsp;swtich 璇彞鍐呯殑妯″潡涓槸鍚堟硶鐨勩€傚綋浠栧叕甯冭繖涓妧宸х粰 C 鐨勫紑鍙戣€呭拰涓栫晫鏃? Duff 娉ㄦ剰鍒?nbsp;C 鐨?nbsp;swtich 璇硶, 鐗瑰埆鏄?nbsp;``璺岃惤" 琛屼負, 涓€鐩存槸琚簤璁殑, 鑰?nbsp;``榪欐浠ｇ爜鍦ㄤ簤璁轟腑褰㈡垚浜嗘煇縐嶈鎹? 浣嗘垜涓嶆竻妤氭槸璧炴垚榪樻槸鍙嶅"銆? switch (count % 8)
{
case 0: do { *to = *from++;
case 7: *to = *from++;
case 6: *to = *from++;
case 5: *to = *from++;
case 4: *to = *from++;
case 3: *to = *from++;
case 2: *to = *from++;
case 1: *to = *from++;
} while (--n > 0);
}
]]>
]]>
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鏁欐巿閫夊嚭涓や釜浠?鍒?鐨勬暟錛屾妸瀹冧滑鐨勫拰鍛婅瘔瀛︾敓鐢詫紝鎶婂畠浠殑縐憡璇夊鐢熶箼錛岃浠栦滑杞祦鐚滆繖涓や釜鏁般€?br /> 鐢茶錛?#8220;鎴戠寽涓嶅嚭”銆?br /> 涔欒錛?#8220;鎴戠寽涓嶅嚭”銆?br /> 鐢茶錛?#8220;鎴戠寽鍒頒簡”銆?br /> 涔欒錛?#8220;鎴戜篃鐚滃埌浜?#8221;銆?br /> 闂繖涓や釜鏁版槸澶氬皯 銆?br /> 錛圥S錛氭澶勬槸鎴戝姞鐨勶紝鍋囪鐢蹭箼鏄粷瀵硅仾鏄庤€屼笖娌℃湁綺楀績鐘敊鎵嶈鍑轟笂闈㈢殑璇濈殑錛?br /> 鈥斺€斺€斺€斺€斺€斺€?瑙ｇ瓟鈥斺€斺€斺€斺€斺€斺€?
鎴戠殑瑙ｇ瓟錛?br /> 鐢茶錛?#8220;鎴戠寽涓嶅嚭”銆傘€€銆€鈶?//姝ゅ彞璇存槑 鍜宼heSum鍙互鍒嗚В涓?涓強浠ヤ笂鐨?-9鏁板瓧鍜?
涔欒錛?#8220;鎴戠寽涓嶅嚭”銆傘€€銆€鈶?//姝ゅ彞璇存槑 縐痶heMul鍙互鍒嗚В涓?涓強浠ヤ笂鐨?-9鏁板瓧縐紝涓旀湁鑷沖皯涓ょ粍鍒嗚В鐨勫洜瀛愬拰瑕佹弧瓚斥憼
鐢茶錛?#8220;鎴戠寽鍒頒簡”銆傘€€銆€鈶?//姝ゅ彞璇存槑 鍜宼heSum鐨勫垎瑙ｇ粍鍚堜腑錛屾湁涓斿彧鏈変竴縐嶇粍鍚堝搴旂殑縐弧瓚斥憽
涔欒錛?#8220;鎴戜篃鐚滃埌浜?#8221;銆傘€€鈶?//姝ゅ彞璇存槑 縐痶heMul鐨勫垎瑙ｇ粍鍚堜腑錛屾湁涓斿彧鏈変竴縐嶇粍鍚堝搴旂殑鍜屾弧瓚斥憿
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……
鎵€浠ヨ搗鐐歸浂澶?000=N+M1+3*M2+5M3+7M4+……
寰堟槑鏄捐繍杈撹繃紼嬩腑姣忎竴孌佃礬鏉ュ洖瓚熸暟瓚婂皯娑堣垂瓚婂皯錛屼粠鍑哄彂鐐瑰紑濮嬶紝絎竴孌佃礬搴旇鏄繍杈撲簡3嬈?3000/1000=3)
鏁?000=N+M1+3*M2+5M3
鎬昏窛紱?000=M1+M2+M3
絎簩孌佃礬璧風偣澶勶紝蹇呯劧涓嶈兘澶т簬2000鍚紝鎸夌収鏉ュ洖瓚熸暟鏈€灝戞秷鑰楁渶灝戠殑瑙傜偣錛岄偅涔堢涓€瓚?鍊嶆秷鑰楄礬紼嬪簲璇ユ秷鑰椾簡1000錛?000-2000錛夊惃鐓わ紝鍗寵窛紱繪槸1000/5=200鍏噷
鍚岀悊錛岀涓夋璺搗鐐瑰錛屽繀鐒朵笉鑳藉ぇ浜?000鍚紝鎵€浠ョ浜屾璺暱搴︿負(2000-1000)/3=333.333
鏈€鍚庝竴孌佃礬闀夸負1000-200-333.333=466.666
鎵€浠ユ€葷殑鍓╀綑鍗蟲渶澶у彲榪愯緭鍒扮洰鐨勫湴鐨勭叅涓?鏈€鍚庝竴孌佃搗鐐圭殑鐓?000鍚?鏈€鍚庝竴孌佃礬娑堣€?1000-466.666=533.333
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榪欎釜闂鍏跺疄鏄ぇ瀹舵兂寰楀鏉備簡錛屾垜娌＄湅絳旀錛屾垜鑷繁瑙夊緱榪欎釜棰樺緢綆€鍗?br />
棣栧厛鍋囪鏈€鍚庡墿涓婲鍚ㄧ叅錛岄偅涔圢涓€瀹氫細灝忎簬1000錛屼負浠€涔堝憿錛岀暀浣犺嚜宸辮€冭檻錛堥殢鐫€浣犵湅涓嬫枃錛屼綘涔熶細鎯沖埌涓轟粈涔堬級
鏈€鍚庝竴孌佃繍杈撲竴瀹氭槸鏃犲線榪旂殑錛岃繖鏍鋒墠浼氫嬌寰楁秷鑰楁渶灝忥紝鍋囪鏈€鍚庝竴孌佃礬闀夸負M1璺濈錛岄偅涔堝湪鏈€鍚庝竴孌佃繍杈撹搗鐐筍1鏃跺墿鐓+M1
鍊掓暟絎簩孌佃礬錛屽嵆S1鍓嶄竴孌佃礬M2(璧風偣涓篠2)錛屼竴瀹氭槸榪愯緭浜嗕袱嬈★紝涔熷氨鏄蛋浜?*M2錛屽湪姝ゆ鐨勮搗鐐瑰墿鐓+M1+3*M2
鍊掓暟絎笁孌佃礬錛屽嵆S2鍓嶄竴孌佃礬M3(璧風偣涓篠3)錛屼竴瀹氭槸榪愯緭浜嗕笁嬈★紝涔熷氨鏄蛋浜?*M3錛屽湪姝ゆ鐨勮搗鐐瑰墿鐓+M1+3*M2+5M3
……
鎵€浠ヨ搗鐐歸浂澶?000=N+M1+3*M2+5M3+7M4+……
寰堟槑鏄捐繍杈撹繃紼嬩腑姣忎竴孌佃礬鏉ュ洖瓚熸暟瓚婂皯娑堣垂瓚婂皯錛屼粠鍑哄彂鐐瑰紑濮嬶紝絎竴孌佃礬搴旇鏄繍杈撲簡3嬈?3000/1000=3)
鏁?000=N+M1+3*M2+5M3
鎬昏窛紱?000=M1+M2+M3
絎簩孌佃礬璧風偣澶勶紝蹇呯劧涓嶈兘澶т簬2000鍚紝鎸夌収鏉ュ洖瓚熸暟鏈€灝戞秷鑰楁渶灝戠殑瑙傜偣錛岄偅涔堢涓€瓚?鍊嶆秷鑰楄礬紼嬪簲璇ユ秷鑰椾簡1000錛?000-2000錛夊惃鐓わ紝鍗寵窛紱繪槸1000/5=200鍏噷
鍚岀悊錛岀涓夋璺搗鐐瑰錛屽繀鐒朵笉鑳藉ぇ浜?000鍚紝鎵€浠ョ浜屾璺暱搴︿負(2000-1000)/3=333.333
鏈€鍚庝竴孌佃礬闀夸負1000-200-333.333=466.666
鎵€浠ユ€葷殑鍓╀綑鍗蟲渶澶у彲榪愯緭鍒扮洰鐨勫湴鐨勭叅涓?鏈€鍚庝竴孌佃搗鐐圭殑鐓?000鍚?鏈€鍚庝竴孌佃礬娑堣€?1000-466.666=533.333
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