diff --git a/volume007/714 - Copying Books(v2).cpp b/volume007/714 - Copying Books(v2).cpp
new file mode 100644
index 00000000..6aec1789
--- /dev/null
+++ b/volume007/714 - Copying Books(v2).cpp	
@@ -0,0 +1,56 @@
+#include <iostream>
+#include <cstring>
+using namespace std;
+
+const int maxn = 505;
+long long num[maxn], sum[maxn];
+char idx[maxn],a[maxn];
+long long leftt,rightt,mid;
+int m,k,n;
+
+inline bool binSearch(){
+    long long val = 0; int cnt = 0;
+    memset(idx, 0, sizeof(idx));
+    for(int i = m; i >= 1; --i){
+        if(val+num[i] <= mid && i >= k-cnt)
+            val += num[i];
+        else{
+            cnt++;
+            val = num[i];
+            idx[i] = 1;
+        }
+    }
+    if(cnt == k-1){
+        memcpy(a, idx ,sizeof(idx));
+        return true;
+    }
+    return false;
+}
+
+int main(){
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+
+    int cas;
+    cin >> cas;
+    while(cas--){
+        rightt = leftt = 0;
+        cin >> m >> k;
+        for(int i = 1; i <= m; ++i){
+            cin >> num[i];
+            rightt += num[i];
+            leftt = num[i]>leftt ? num[i]:leftt;
+        }
+        while(rightt >= leftt){
+            mid = (leftt+rightt) >> 1;
+            if(binSearch()) rightt = mid -1;
+            else leftt = mid+1;
+        }
+        for(int i = 1; i < m; ++i){
+            cout << num[i] << ' ';
+            if (a[i] == 1) cout << '/' << ' ';
+        }
+        cout << num[m] << '\n';
+    }
+    return 0;
+}
diff --git a/volume014/1442 - Cav.cpp b/volume014/1442 - Cav.cpp
new file mode 100644
index 00000000..cb8ed5b1
--- /dev/null
+++ b/volume014/1442 - Cav.cpp	
@@ -0,0 +1,36 @@
+#include <iostream>
+#include <cstdio>
+using namespace std;
+
+const int maxn = 1e6+5;
+int cas, n, cnt;
+int ceiling[maxn], floor[maxn];
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+    //freopen("input.txt" , "r", stdin );
+    //freopen("output.txt", "w", stdout);
+    cin >> cas;
+    while(cas--) {
+        cnt = 0;
+        cin >> n;
+        for (int i = 0; i < n; ++i) cin >> floor[i];
+        for (int i = 0; i < n; ++i) cin >> ceiling[i];
+        int tmp = maxn;
+        for (int i = 0; i < n; ++i) {
+            tmp = min(tmp, ceiling[i]);
+            tmp = max(tmp, floor[i]);
+            ceiling[i] = tmp;
+        }
+        tmp = maxn;
+        for (int i = n-1; i > -1; --i) {
+            tmp = min(tmp, ceiling[i]);
+            tmp = max(tmp, floor[i]);
+            ceiling[i] = tmp;
+            cnt += ceiling[i] - floor[i];
+        }
+        cout << cnt << '\n';
+    }
+    return 0;
+}
diff --git a/volume014/1451 - Average(v2).cpp b/volume014/1451 - Average(v2).cpp
new file mode 100644
index 00000000..ae2dfb58
--- /dev/null
+++ b/volume014/1451 - Average(v2).cpp	
@@ -0,0 +1,51 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+const int maxn = 100005;
+int n, L, start, ending,temp;
+double maxd;
+int DNA[maxn],cav[maxn];
+string str;
+
+inline int cntAverage(int L, int r, int LL, int rr, int DNA[]){
+	return (DNA[r]-DNA[L])*(rr-LL) - (DNA[rr]-DNA[LL])*(r-L);
+}
+
+inline void changePoint(int pits,int bump){
+	double temp;
+	temp = cntAverage(pits, bump, start-1, ending, DNA);
+	if (temp < 0) return;
+	if (temp || (bump-pits) < (ending-start+1)){
+		maxd = temp;
+		start = pits + 1;
+		ending = bump;
+	}
+}
+
+int main(){
+	ios::sync_with_stdio(false);
+	cin.tie(0);
+
+	int cas;
+	cin >> cas;
+	while (cas--){
+		int find = 0, cor = -1;
+		cin >> n >> L; cin.get();
+		getline(cin, str);
+		for (int i = 1; i <= n; ++i)
+			DNA[i] = DNA[i-1] + (str[i-1] == '1');
+		maxd = DNA[L] / L, start = 1, ending = L;
+		for (int i = L; i <= n; ++i){
+			temp = i - L;
+			while (find < cor && cntAverage(cav[cor], temp, cav[cor - 1], cav[cor], DNA) <= 0)
+				--cor;
+			cav[++cor] = temp;
+			while (find < cor && cntAverage(cav[find], i, cav[find + 1], i, DNA) <= 0)
+				++find;
+			changePoint(cav[find],i);
+		}
+		cout << start << ' ' << ending << '\n';
+	}
+	return 0;
+}
diff --git a/volume014/1471 - Defense Lines.cpp b/volume014/1471 - Defense Lines.cpp
new file mode 100644
index 00000000..cf0f0e18
--- /dev/null
+++ b/volume014/1471 - Defense Lines.cpp	
@@ -0,0 +1,41 @@
+#include <iostream>
+#include <algorithm>
+#include <cstring>
+using namespace std;
+
+const int maxn = 2*1e5+1;
+int n,ans;
+int a[maxn],g[maxn],f[maxn],bin[maxn];
+int main(){
+	ios::sync_with_stdio(false);
+	cin.tie(0);
+
+	int cas;
+	cin >> cas;
+	while (cas--){
+		cin >> n;
+		for (int i = 1; i <= n; ++i){
+			cin >> a[i];
+			if (a[i]>a[i - 1])
+				g[i] = g[i - 1] + 1;
+			else g[i] = 1;
+		}
+		a[n + 1] = 0;
+		for (int i = n; i > 0; --i){
+			if (a[i] < a[i + 1])
+				f[i] = f[i + 1] + 1;
+			else f[i] = 1;
+		}
+
+		ans = 0;
+		memset(bin, 0x7f, sizeof(bin));
+		bin[0] = -1;
+		for (int i = 1; i <= n; ++i){
+			ans = max(ans, int(f[i]+lower_bound(bin, bin+n, a[i])-bin-1));
+			bin[g[i]] = min(bin[g[i]], a[i]);
+		}
+
+		cout << ans << '\n';
+	}
+	return 0;
+}
diff --git a/volume016/1606 - Amphiphilic Carbon Molecules.cpp b/volume016/1606 - Amphiphilic Carbon Molecules.cpp
new file mode 100644
index 00000000..698d5c97
--- /dev/null
+++ b/volume016/1606 - Amphiphilic Carbon Molecules.cpp	
@@ -0,0 +1,68 @@
+#include<iostream>  
+#include<algorithm>      
+#include<cmath>     
+using namespace std;   
+  
+const int N=1001;  
+  
+class Point{  
+public:
+    int x,y,color;  
+    double rad;  
+    bool operator<(const Point &rhs)const{  
+        return rad<rhs.rad;  
+    }  
+}dot[N],tempDot[N];  
+  
+int n, num; 
+  
+bool isInArea(Point A,Point B){  
+    return A.x*B.y-A.y*B.x>=0;  
+}  
+  
+int main(){  
+	ios::sync_with_stdio(false);
+	cin.tie(0);
+	
+    while(cin>>n && n){  
+        for(int i=0;i<(n);i++)    
+			cin >> dot[i].x >> dot[i].y >> dot[i].color;  
+        if(n<=2) return 2;  
+		int ans=0;  
+  
+		for(int i=0;i<n;i++){  
+			num=0;  
+			for(int j=0;j<n;j++){ 
+				if(j == i) continue;   
+				tempDot[num].x=dot[j].x-dot[i].x;  
+				tempDot[num].y=dot[j].y-dot[i].y;  
+				if(dot[j].color){
+					tempDot[num].x=-tempDot[num].x;
+					tempDot[num].y=-tempDot[num].y;
+				} 
+				tempDot[num].rad=atan2(tempDot[num].y,tempDot[num].x);  
+				num++;  
+			}  
+			sort(tempDot,tempDot+num);  
+  
+			int divi=0,scani=0,cnt=2;  
+			while(divi<num){  
+            if(scani==divi){
+				scani=scani+1; 
+				if(scani >= num) scani = scani-num;
+				cnt++;
+			}  
+            while(scani!=divi && isInArea(tempDot[divi],tempDot[scani])){  
+                scani=scani+1; 
+				if(scani >= num) scani = scani-num;
+                cnt++;  
+            }  
+            cnt--;
+            divi++;   
+            ans=max(ans,cnt); 
+			}  
+		}  
+		cout << ans << '\n';  
+	}
+	return 0;	
+}
diff --git a/volume016/1607 - Gates.cpp b/volume016/1607 - Gates.cpp
new file mode 100644
index 00000000..78d829e7
--- /dev/null
+++ b/volume016/1607 - Gates.cpp	
@@ -0,0 +1,50 @@
+#include<iostream>    
+using namespace std;
+
+#define LL gate[i].in1
+#define RR gate[i].in2
+
+class gateClass {
+public:
+    int in1, in2, out;
+} gate[200005];
+int n, m, all0, all1;
+
+int getOutput(int pos) {
+    for (int i = 1; i <= m; i++) {
+        int x = LL>0 ? gate[LL].out:-LL<=pos;
+        int y = RR>0 ? gate[RR].out:-RR<=pos;
+        gate[i].out = !(x && y);
+    }
+    return gate[m].out;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+
+    int cas , mid;
+    cin >> cas;
+    while (cas--) {
+        cin >> n >> m;
+        for (int i = 1; i <= m; i++)
+            cin >> gate[i].in1 >> gate[i].in2;
+        int all0 = getOutput(0);
+        int all1 = getOutput(n);
+        if (all0 == all1) {
+            for (int i = 1; i <= n; i++) cout << '0';
+        } else {
+            int lef = 1, rit = n;
+            while (lef < rit) {
+                mid = lef + rit >> 1;
+                if (getOutput(mid) == all1) rit = mid;
+                else lef = mid + 1;
+            }
+            for (int i = 1; i < rit; i++) cout << '1';
+            cout << 'x';
+            for (int i = rit + 1; i <= n; i++) cout << '0';
+        }
+        cout << '\n';
+    }
+    return 0;
+}
diff --git a/volume016/1609 - Foul Play.cpp b/volume016/1609 - Foul Play.cpp
new file mode 100644
index 00000000..08602c88
--- /dev/null
+++ b/volume016/1609 - Foul Play.cpp	
@@ -0,0 +1,69 @@
+#include <iostream>
+#include <cstdio>
+#include <vector>
+using namespace std;
+
+const int maxn = 1025;
+char team[maxn][maxn];
+int n;
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+    //freopen("input.txt" , "r", stdin );
+    //freopen("output.txt", "w", stdout);
+    while(cin >> n){
+        for(int i = 1; i <= n; ++i) {
+            cin >> team[i]+1;
+        }
+        vector<int> win, lose;
+        for(int i = 2; i <= n; ++i) {
+            if(team[1][i] == '1')
+                win.push_back(i);
+            else lose.push_back(i);
+        }
+        int leftTeam = n;
+        while (leftTeam > 1) {
+            vector<int> winSub, loseSub, round3;
+            for(int i = 0; i < lose.size(); ++i) {
+                bool matched = false;
+                for(int j = 0; j < win.size(); ++j){
+                    if(win[j] && team[win[j]][lose[i]] == '1'){
+                        cout << win[j] << ' ' <<lose[i] << '\n';
+                        matched = true;
+                        winSub.push_back(win[j]);
+                        win[j] = 0;
+                        break;
+                    }
+                }
+                if(!matched) round3.push_back(lose[i]);
+            }
+
+            bool isOK = false;
+            for(int i = 0; i < win.size(); ++i) {
+                if(win[i]) {
+                    if(!isOK){
+                        cout << "1 " << win[i] << '\n';
+                        isOK = true;
+                    } else {
+                        round3.push_back(win[i]);
+                    }
+                }
+            }
+
+            for(int i = 0; i < round3.size(); i += 2) {
+                cout << round3[i] << ' ' << round3[i+1] << '\n';
+                int tmp = round3[i+1];
+                if(team[round3[i]][tmp] == '1')
+                    tmp = round3[i];
+                if(team[1][tmp] == '1') winSub.push_back(tmp);
+                else loseSub.push_back(tmp);
+            }
+
+            win = winSub;
+            lose = loseSub;
+            leftTeam >>= 1;
+        }            
+    }
+    return 0;
+}
+        
diff --git a/volume115/11572 - Unique Snowflakes(v2).cpp b/volume115/11572 - Unique Snowflakes(v2).cpp
new file mode 100644
index 00000000..42858a1f
--- /dev/null
+++ b/volume115/11572 - Unique Snowflakes(v2).cpp	
@@ -0,0 +1,34 @@
+#include <iostream>
+#include <algorithm>
+#include <cmath>
+#include <cstring>
+using namespace std;
+
+int snowflakes[1000000+1];
+int idx[1000000 + 1];
+int n;
+int main(){
+	ios::sync_with_stdio(false);
+	cin.tie(0);
+
+	int cas;
+	cin >> cas;
+	while (cas--){
+		int maxSnow = 0;
+		int l = 0, r = 0;
+		memset(idx, 0, sizeof(idx));
+		cin >> n;
+		for (int i = 0; i < n; ++i){
+			cin >> snowflakes[i];
+		}
+
+		while (r < n){
+			while (r < n && !idx[snowflakes[r]])
+				idx[snowflakes[r++]] = 1;
+			maxSnow = max(maxSnow, r - l);
+			idx[snowflakes[l++]] = 0;
+		}
+		cout << maxSnow << '\n';
+	}
+	return 0;
+}
diff --git a/volume115/11572 - Unique Snowflakes.cpp b/volume115/11572 - Unique Snowflakes.cpp
new file mode 100644
index 00000000..4ed180c7
--- /dev/null
+++ b/volume115/11572 - Unique Snowflakes.cpp	
@@ -0,0 +1,34 @@
+#include <iostream>
+#include <set>
+#include <algorithm>
+using namespace std;
+
+const int maxn = 1000001;
+int snowflakes[maxn];
+int n;
+set<int> snow;
+int main(){
+	ios::sync_with_stdio(false);
+	cin.tie(0);
+
+	int cas;
+	cin >> cas;
+	while (cas--){
+		int maxSnow = 0;
+		int l = 0, r = 0;
+		snow.clear();
+		cin >> n;
+		for (int i = 0; i < n; ++i){
+			cin >> snowflakes[i];
+		}
+
+		while (r < n){
+			while (r < n && !snow.count(snowflakes[r]))
+				snow.insert(snowflakes[r++]);
+			maxSnow = max(maxSnow, r - l);
+			snow.erase(snowflakes[l++]);
+		}
+		cout << maxSnow << '\n';
+	}
+	return 0;
+}
diff --git a/volume126/12627 - Erratic Expansion.cpp b/volume126/12627 - Erratic Expansion.cpp
new file mode 100644
index 00000000..979fdd9a
--- /dev/null
+++ b/volume126/12627 - Erratic Expansion.cpp	
@@ -0,0 +1,29 @@
+#include <iostream>
+using namespace std;
+
+long long k, a, b, tot;
+long long idx[31] = {1};
+
+long long solve(long long k, long long i){
+    if (!i) return 0;
+    if (!k) return 1;
+    if (i > (1LL << k-1))
+        return (solve(k-1, i-(1LL << k-1)) + 2 * idx[k-1]);
+    return 2 * solve(k-1, i);
+}
+
+int main(){
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+
+    int cas, n = 0;
+    cin >> cas;
+    for (int i = 1; i < 30; ++i)
+        idx[i] = 3 * idx[i-1];
+    while (++n <= cas){
+        cin >> k >> a >> b;
+        tot = solve(k, b) - solve(k, a-1);
+        cout << "Case " << n  << ": "<< tot << '\n';
+    }
+    return 0;
+}