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Searching/Binary Search/Competitive Programming/Book Allocation Problem.cpp

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+#include<bits/stdc++.h>
+using namespace std;
+
+
+int findPages(int arr[], int n, int m);
+
+int main() {
+    int t;
+    cin>>t;
+    while(t--){
+        int n;
+        cin>>n;
+        int A[n];
+        for(int i=0;i<n;i++){
+            cin>>A[i];
+        }
+        int m;
+        cin>>m;
+        cout << findPages(A, n, m) << endl;
+    }
+    return 0;
+}
+
+bool solve(int *a, int n, int mid, int m){
+    int stu = 1;
+    int sum = 0;
+    for(int i=0; i<n; i++){
+        if(a[i]>mid) return false;
+        if(a[i]+sum > mid){
+            stu++;
+            sum = a[i];
+            if(stu>m) return false;
+        }
+        else sum += a[i];
+    }
+    return true;
+}
+
+int findPages(int *a, int n, int m) {
+    int lb = 0;
+    int s = 0; 
+    int ans = 0;
+    for(int i=0; i<n; i++) s+= a[i];
+    int ub = s;
+    while(lb<=ub){
+        int mid = (lb + ub) / 2;
+        if(solve(a, n, mid, m)){
+            ans = mid;
+            ub = mid - 1;
+        }
+        else{
+            lb = mid + 1;
+        }
+    }
+    return ans;
+}