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public class DrunkPirate {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int i=0;
float result;
//第四轮至少两个人,每一轮至少淘汰一个人,前一轮比后一轮至少多1个人
//然后还想到一点,第四轮最多也能只有两个人,如果超过两个,那么海盗喝酒量最多为1/6+1/5+1/4+1/3<1
//所以确定第四轮比须是两个人
for(int y1 = 5; y1 <= 20; y1++){
for(int y2 = 4; y2 < y1; y2++){
for(int y3 = 3; y3<y2; y3++){
//y3增大,1/y3就会减小,如果前面酒量之和开始小于0.5,y3就不用再增加了
if(( (float)1/y1 + (float)1/y2 + (float)1/y3 ) < 0.50f){
break;
}
result = (float)1/y1 + (float)1/y2 + (float)1/y3 + (float)1/2.00f;
if(result == 1.0){
System.out.println(result);
System.out.println(y1+", "+y2+", "+y3+", 2");
}
}
}
}
}
}
int n = 20;
for (int i = n; i > 3; i--) {
for (int j = i-1; j > 2; j--) {
for (int k = j-1; k > 1; k--) {
for (int m = k-1; m > 0; m--) {
long left = j * k * m + i * k * m + i * j * m + i * j
* k;
long right = i * j * k * m;
if (left == right) {
System.out.println(i + " " + j + " " + k + " "
+ " " + m);
}
}
}
}
}
20 5 4 2
18 9 3 2
15 10 3 2
12 6 4 2public class DrunkPirate {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int i=0;
//最后一轮至少两个人,每一轮至少淘汰一个人
for(int y1 = 5; y1 <= 20; y1++){
for(int y2 = 4; y2 < y1; y2++){
for(int y3 = 3; y3<y2; y3++){
for(int y4 = 2; y4<y3; y4++){
i++;
float result = (float)1/y1 + (float)1/y2 + (float)1/y3 + (float)1/y4;
if(result == 1){
System.out.println(result);
System.out.println(y1+", "+y2+", "+y3+", "+y4);
}
}
}
}
}
System.out.println("Totally try "+i+" times");
}
}
时间复杂度,有待提高! if(c==')' || c==']' || c=='}')
{
if(a.empty) return false; // 填空
if(a.pop() != c) return false;
}
}
if(!a.empty) return false; // 填空
public static void main(String[] args) throws Exception {
String ss = "123456789";
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
List<char[]> list = new ArrayList<>();
for (int b = 1; b < 256; b++) {
String temp = Integer.toBinaryString(b & 0xFF);
temp = lpad(temp, "0", 8);
list.add(temp.toCharArray());
}
List<List<Integer>> cNums = new ArrayList<>();
for (char[] cs : list) {
List<Integer> cn = new ArrayList<>();
int begin = 0;
int end = 0;
for (int i = 0; i < cs.length; i++) {
if (cs[i] == '1') {
end = i;
cn.add(Integer.parseInt(ss.substring(begin, end + 1)));
begin = end + 1;
}
}
cn.add(Integer.parseInt(ss.substring(begin, ss.length())));
cNums.add(cn);
}
List<String> js = new ArrayList<>();
for (List<Integer> list2 : cNums) {
String jsd = "";
for (int i = 0; i < Math.pow(2, list2.size() - 1); i++) {
String temp = Integer.toBinaryString(i & 0xFF);
temp = lpad(temp, "0", list2.size() - 1);
char[] ddd = temp.toCharArray();
jsd = list2.get(0) + "";
for (int j = 0; j < ddd.length; j++) {
if (ddd[j] == '0') {
jsd += "+" + list2.get(j + 1);
} else {
jsd += "-" + list2.get(j + 1);
}
}
js.add(jsd);
}
}
for (String string : js) {
int jg = ((Double) engine.eval(string)).intValue();
if (jg == 110) {
System.out.print(string + "=" + jg);
System.out.println(" true ***********");
} else {
// System.out.print(string + "="+jg);
// System.out.println(" false ***********");
}
}
}
private static String lpad(String temp, String m, int length) {
int tempLenth = temp.length();
if (tempLenth < length) {
for (int i = 0; i < length - tempLenth; i++) {
temp = m + temp;
}
}
return temp;
}
123+4+5+67-89=110 true ***********
123+4-5-6-7-8+9=110 true ***********
123-4+5-6-7+8-9=110 true ***********
123-4-5+6+7-8-9=110 true ***********
12+34+56+7-8+9=110 true ***********
12+3+45+67-8-9=110 true ***********
12-3+4-5+6+7+89=110 true ***********
1+234-56-78+9=110 true ***********
1+2+34+5+67-8+9=110 true ***********
1-2+3+45-6+78-9=110 true ***********
public static void main(String[] args) {
int pNum = 10;
List<Integer> list = new ArrayList<>();
while (pNum <= 20) {
list.clear();
System.out.println("--------------------------" + pNum);
for (int i = 2; i < pNum; i++) {
if (pNum % i == 0) {
list.add(i);
}
}
if (list.size() < 3) {
pNum++;
continue;
}
int s2 = 0;
int s3 = 0;
int s4 = 0;
for (int c1 = 0; c1 < list.size() - 2; c1++) {
s2 = list.get(c1);
for (int c2 = c1+1; c2 < list.size() - 1; c2++) {
s3 = list.get(c2);
for (int c3 = c2+1; c3 < list.size(); c3++) {
s4 = list.get(c3);
if (1 + s2 + s3 + s4 == pNum) {
System.out.println((pNum/1) + " " + (pNum/s2) + " "
+ (pNum/s3) + " " + (pNum/s4)+" 0");
}
}
}
}
pNum++;
}
}