diff --git a/src/apple.c b/src/apple.c
index 766d543..ca58134 100644
--- a/src/apple.c
+++ b/src/apple.c
@@ -4,14 +4,28 @@ int n;
 int k;
 int A[100000];
 
+int p(int m){
+  int i,sum;
+  sum=0;
+  for(i=0;i<n;i++){sum=sum+(A[i]+m-1)/m;}
+  return sum <= k;
+}
+
 
 int main(){
   int i, lb, ub;
   scanf("%d%d", &n, &k);
+  lb=0;
+  ub=1000000000;
   for(i = 0; i < n; i++){
     scanf("%d", &A[i]);
   }
+  while(ub-lb >1){
+    int mid=(lb+ub)/2;
+    if(p(mid)){ub=mid;}
+    else{lb=mid;}
+  }
 
-
+  printf("%d\n",ub);
   return 0;
 }
diff --git a/src/array.c b/src/array.c
index 13ed925..a7caa76 100644
--- a/src/array.c
+++ b/src/array.c
@@ -6,13 +6,18 @@ int A[100000];
 
 
 int main(){
-  int i, lb, ub;
+  int i, lb, ub; /* 追記する */
   scanf("%d%d", &n, &k);
+  lb=-1;
+  ub=n;
   for(i = 0; i < n; i++){
     scanf("%d", &A[i]);
   }
-
-
-
-  return 0;
+  while(ub-lb >1){
+    int mid=(lb+ub)/2;
+    if(A[mid]>=k) ub=mid;
+    else lb=mid;
+  }
+  printf("%d\n",ub);
+  return ub;
 }
diff --git a/src/spear.c b/src/spear.c
index 766d543..2a72f6a 100644
--- a/src/spear.c
+++ b/src/spear.c
@@ -4,14 +4,27 @@ int n;
 int k;
 int A[100000];
 
+int p(int m){
+  int i,sum;
+  sum=0;
+  for(i=0;i<n;i++){sum=sum+A[i]/m;}
+  return sum >=k;
+
+}
 
 int main(){
   int i, lb, ub;
   scanf("%d%d", &n, &k);
+  lb=0;
+  ub=1000000001;
   for(i = 0; i < n; i++){
     scanf("%d", &A[i]);
   }
-
-
+  while(ub-lb>1){
+    int mid=(ub+lb)/2;
+    if(p(mid)){lb=mid;}
+    else{ub=mid;}
+  }
+  printf("%d\n",lb);
   return 0;
 }