diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1 @@
+
diff --git a/src/apple.c b/src/apple.c
index 766d543..fa3fd56 100644
--- a/src/apple.c
+++ b/src/apple.c
@@ -4,14 +4,41 @@ int n;
 int k;
 int A[100000];
 
+unsigned int p(int x)
+{
+  int sum = 0;
+  for (int i = 0; i < n; i++)
+  {
+    sum += (A[i] + x - 1) / x;
+  }
+
+  return sum <= k;
+}
 
-int main(){
-  int i, lb, ub;
+int main()
+{
+  int i;
   scanf("%d%d", &n, &k);
-  for(i = 0; i < n; i++){
+  for (i = 0; i < n; i++)
+  {
     scanf("%d", &A[i]);
   }
 
+  int lb = 0;
+  int ub =  1000000000;
+
+  while (ub - lb > 1)
+  {
+    int mid = (lb + ub) / 2;
+
+    if (p(mid))
+      ub = mid;
+
+    else
+      lb = mid;
+  }
+
+  printf("%d", ub);
 
   return 0;
 }
diff --git a/src/array.c b/src/array.c
index 13ed925..ae37751 100644
--- a/src/array.c
+++ b/src/array.c
@@ -4,15 +4,30 @@ int n;
 int k;
 int A[100000];
 
-
-int main(){
-  int i, lb, ub;
+int main()
+{
+  int i;
   scanf("%d%d", &n, &k);
-  for(i = 0; i < n; i++){
+  for (i = 0; i < n; i++)
+  {
     scanf("%d", &A[i]);
   }
 
+  int lb = -1;
+  int ub = n;
+
+  while (ub - lb > 1)
+  {
+    int mid = (lb + ub) / 2;
+
+    if (A[mid] >= k)
+      ub = mid;
+
+    else
+      lb = mid;
+  }
 
+  printf("%d", ub);
 
   return 0;
 }
diff --git a/src/spear.c b/src/spear.c
index 766d543..ae166b4 100644
--- a/src/spear.c
+++ b/src/spear.c
@@ -4,14 +4,40 @@ int n;
 int k;
 int A[100000];
 
+unsigned int p(int x)
+{
+  int sum = 0;
+  for (int i = 0; i < n; i++)
+  {
+    sum += A[i] / x;
+  }
+
+  return sum < k;
+}
 
-int main(){
-  int i, lb, ub;
+int main()
+{
+  int i;
   scanf("%d%d", &n, &k);
-  for(i = 0; i < n; i++){
+  for (i = 0; i < n; i++)
+  {
     scanf("%d", &A[i]);
   }
 
+  int lb = 0;
+  int ub =  1000000000;
+
+  while (ub - lb > 1)
+  {
+    int mid = (lb + ub) / 2;
+
+    if (p(mid))
+      ub = mid;
+    else
+      lb = mid;
+  }
+
+  printf("%d", lb);
 
   return 0;
 }
diff --git a/src/works.c b/src/works.c
index 766d543..b6a25fc 100644
--- a/src/works.c
+++ b/src/works.c
@@ -4,14 +4,50 @@ int n;
 int k;
 int A[100000];
 
+unsigned int p(int x)
+{
+  int sum = 0;
+  int w = 1;
+  for (int i = 0; i < n; i++)
+  {
+    if (A[i] > x)
+      return 0;
+    if (sum + A[i] > x)
+    {
+      sum = A[i];
+      w++;
+    }
+    else
+    {
+      sum += A[i];
+    }
+  }
+  return w <= k;
+}
 
-int main(){
-  int i, lb, ub;
+int main()
+{
+  int i;
   scanf("%d%d", &n, &k);
-  for(i = 0; i < n; i++){
+  for (i = 0; i < n; i++)
+  {
     scanf("%d", &A[i]);
   }
 
+  int lb = 0;
+  int ub = 1000000000;
+
+  while (ub - lb > 1)
+  {
+    int mid = (lb + ub) / 2;
+
+    if (p(mid))
+      ub = mid;
+    else
+      lb = mid;
+  }
+
+  printf("%d", ub);
 
   return 0;
 }