Codemania

Author: harrypotter0

CP/Codeforces Round #464 (Div. 2)/prob1.py

@@ -0,0 +1,45 @@
+n = int(input())
+arr = map(int,raw_input().split())
+a=[]
+f=0
+j=0
+for i in range(0,n):
+    vec = arr[i]
+    while j<n and vec!=n:
+        if(arr[i] in a):
+            # print(a)
+            f=1
+            break
+        if(vec!=arr[vec-1]):
+            vec=arr[vec-1]
+        a.append(vec)
+        j+=1
+    print(a)
+    if(f and len(a)==3): break
+    del a[:]
+
+# del lst[:]
+
+# print(a)
+if(f and len(a)==3):
+     print("YES")
+else:
+     print("NO")
+
+
+'''
+5
+2 4 5 1 3
+
+5
+4 2 1 3 5
+
+5
+4 1 2 3 5
+
+
+5
+5 5 5 5 1
+
+
+'''

CP/Codemania/prob5.cpp

@@ -0,0 +1,74 @@
+#include "bits/stdc++.h"
+using namespace std;
+typedef long long ll;
+const ll siz = 5e5 + 4;
+const ll inf = 1e18;
+ll arr[siz], tree[4 * siz];	//Size of Segment tree is never going to be more than 4 * siz.
+
+void build(ll node, ll start, ll end) {
+  if(start == end)
+    tree[node] = arr[start];       // Leaf node will have a single element.
+  else {
+    ll mid = (start + end) / 2;
+    build(2 * node, start, mid);	// Recurse on the left child.
+    build(2 * node + 1, mid + 1, end);	// Recurse on the right child.
+    // Internal node will have the sum of both of its children.
+    tree[node] = max(tree[2 * node], tree[2 * node + 1]);
+  }
+}
+
+ll query(ll node, ll start, ll end, ll l, ll r) {
+  if(r < start || end < l)
+    return -inf;	// range represented by a node is completely outside the given range.
+  if(l <= start && end <= r)
+    return tree[node];	// range represented by a node is completely inside the given range.
+  // range represented by a node is partially inside and partially outside the given range.
+  ll mid = (start + end) / 2;
+  ll s1 = query(2 * node, start, mid, l, r);
+  ll s2 = query(2 * node + 1, mid + 1, end, l, r);
+  return max(s1 ,s2);
+}
+
+int main(){
+  ll n, q;
+  scanf("%lld %lld", &n, &q);
+  vector<pair<ll, ll> > v;
+  map<ll, ll> mp;
+  for(ll i = 0; i < n; ++i){
+    ll l, r, s;
+    scanf("%lld %lld %lld", &l, &r, &s);
+    mp[l] += s;
+    mp[r + 1] = mp[r + 1] - s;
+  }
+  vector<ll> v1;
+  for(auto it = mp.begin(); it != mp.end(); ++it){
+    v.push_back({it->first, it->second});
+    v1.push_back(it->first);
+  }
+  sort(v.begin(), v.end());
+  sort(v1.begin(), v1.end());
+  arr[0] = v[0].second;
+  for(ll i = 1; i < v1.size(); ++i){
+    arr[i] = arr[i - 1] + v[i].second;
+  }
+  /*for(int i = 0; i < v1.size(); ++i){
+    cout<<v[i].first<<" "<<arr[i]<<"\n";
+  }*/
+  build(1, 0, v1.size() - 1);
+  while(q--){
+    ll l, r;
+    scanf("%lld %lld", &l, &r);
+    ll left = lower_bound(v1.begin(), v1.end(), l) - v1.begin();
+    if(v1[left] > l && left > 0)
+      left--;
+    ll right = upper_bound(v1.begin(), v1.end(), r) - v1.begin();
+    right--;
+    if(right < 0 || v1[v1.size() - 1] < l){
+      //cout<<"OK\n";
+      printf("0\n");
+    }
+    else{
+      printf("%lld\n", query(1, 0, v1.size() - 1, left, right));
+    }
+  }
+}

CP/Educational Codeforces Round 38 (Rated for Div. 2)/prob2.py

@@ -5,5 +5,4 @@
 ans=min(a[n-1]-x,y-a[0])
 for i in range(n-1):
     ans=min(ans,max(a[i]-x,y-a[i+1]) )
-print ans
-        
+print ans        

CP/Educational Codeforces Round 38 (Rated for Div. 2)/prob3.py

@@ -3,8 +3,9 @@
 ps[1] = True
 for i in range(len(ps)):
     if not ps[i]:
-        for k in range(i*i, i, len(ps)):
+        for k in range( i*i, i, len(ps)):
             ps[k] = True
+print(ps)
 primes = [i for i, v in enumerate(ps) if not v]
 
 t = int(raw_input())