zguolee

第7章贪心策略/7.1简单贪心/7-1鸡兔同笼.cpp

@@ -1,16 +1,14 @@
 #include<iostream>
-
 using namespace std;
-
 int main() {
     int a;
     while(scanf("%d",&a)!=EOF) {
-        int minimun=0,maximun=0;
-        if(a%2==0) {
-            minimun=a/4+(a%4)/2;
-            maximun=a/2;
+        int maxinum=0,mininum=0;
+        if(a%2==0){
+            maxinum=a/2;
+            mininum=a/4+(a%4)/2;
         }
-        printf("%d %d\n",minimun,maximun);
+        printf("%d %d\n",mininum,maxinum);
     }
     return 0;
 }

第7章贪心策略/7.1简单贪心/7-2FatMouse Trade.cpp

@@ -1,6 +1,5 @@
 #include<iostream>
 #include<algorithm>
-
 using namespace std;
 /**
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@@ -22,21 +21,20 @@ int main() {
     while(scanf("%d%d",&m,&n)!=EOF) {
         if(m==-1&&n==-1)break;
         for(int i=0; i<n; i++) {
-            scanf("%lf%lf",&bean[i].weight,&bean[i].cost);
+            scanf("%lf%lf",&bean[i].weight,&bean[i].weight);
         }
         sort(bean,bean+n,Compare);
         double answer=0;
         for(int i=0; i<n; i++) {
-            if(m>bean[i].cost) {
-                answer+=bean[i].weight;
+            if(m>=bean[i].cost) {
                 m-=bean[i].cost;
+                answer+=bean[i].weight;
             } else {
-                answer+=(bean[i].weight/bean[i].cost)*m;
+                answer+=(m/bean[i].cost)*bean[i].weight;
                 break;
             }
         }
-        printf("%0.3f\n",answer);
+        printf("%.3f\n",answer);
     }
-
     return 0;
 }

第7章贪心策略/7.2区间贪心/7-4今年暑假不AC.cpp

@@ -1,6 +1,5 @@
 #include<iostream>
 #include<algorithm>
-
 using namespace std;
 /**
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@@ -12,25 +11,24 @@ struct Program {
     int endTime;
 };
 
-Program programs[MAXN];
-
 bool Compare(Program x,Program y) {
     return x.endTime<y.endTime;
 }
 
 int main() {
     int n;
+    Program program[MAXN];
     while(scanf("%d",&n)!=EOF) {
         if(n==0)break;
         for(int i=0; i<n; i++) {
-            scanf("%d%d",&programs[i].startTime,&programs[i].endTime);
+            scanf("%d%d",&program[i].startTime,&program[i].endTime);
         }
-        sort(programs,programs+n,Compare);
+        sort(program,program+n,Compare);
         int currentTime=0,answer=0;
         for(int i=0; i<n; i++) {
-            if(programs[i].startTime>=currentTime) {
+            if(currentTime<=program[i].startTime) {
                 answer++;
-                currentTime=programs[i].endTime;
+                currentTime=program[i].endTime;
             }
         }
         printf("%d\n",answer);

第8章递归与分治/8.1递归策略/8-2汉诺塔Ⅲ.cpp

@@ -1,7 +1,5 @@
 #include<iostream>
-
 using namespace std;
-
 long long fac(int n) {
     if(n==1) {
         return 2;

第8章递归与分治/8.1递归策略/test8-1杨辉三角形.cpp

@@ -1,7 +1,5 @@
 #include<iostream>
-
 using namespace std;
-
 int fun(int x,int y) {
     if(y==1||x==y) {
         return 1;

第8章递归与分治/8.1递归策略/test8-2全排列.cpp

@@ -0,0 +1,23 @@
+#include<iostream>
+#include<algorithm>
+using namespace std;
+void pailie(string &str,int s,int t) {
+    if(s==t) {
+        cout<<str<<endl;
+        return;
+    } else {
+        for(int i=s; i<=t; i++) {
+            swap(str[s],str[i]);
+            pailie(str,s+1,t);
+            swap(str[s],str[i]);
+        }
+    }
+}
+int main() {
+    string str;
+    while(getline(cin,str)) {
+        sort(str.begin(),str.end());
+        pailie(str,0,str.size()-1);
+    }
+    return 0;
+}

第8章递归与分治/8.2分治法/8-3Fibonacci.cpp

@@ -1,7 +1,5 @@
 #include<iostream>
-
 using namespace std;
-
 int Fibonacci(int n) {
     if(n==0||n==1) {
         return n;

第8章递归与分治/8.2分治法/8-4二叉树.cpp

@@ -1,5 +1,4 @@
 #include<iostream>
-
 using namespace std;
 /**
 二叉树

第8章递归与分治/8.2分治法/test8-3 2的幂次方.cpp

@@ -8,9 +8,7 @@ using namespace std;
 
 void print(int num) {
     int i=0;
-    while(pow(2,i)<=num) {
-        i++;
-    }
+    while(pow(2,i)<=num)i++;
     i--;
     if(i==0) {
         printf("2(0)");