pre coders v8

README.md

@@ -1,3 +1,7 @@
 [![Code Health](https://landscape.io/github/HackersUOP/codeBase/master/landscape.svg?style=flat)](https://landscape.io/github/HackersUOP/codeBase/master)
 # codeBase
-This repository is to store useful algorithms which are used frequently and to study them
+This repository is to store useful algorithms which are used frequently and to study them.
+
+# Google Group
+
+All information regarding the programming related activities of the deaprtment are archived in [https://groups.google.com/forum/#!forum/cepdnaclk](https://groups.google.com/forum/#!forum/cepdnaclk)

codeBase/ACES_Coders/v7.0/coders/RichestDay.py

@@ -0,0 +1,20 @@
+'''
+	gihanjayatilaka[at]eng[dot]pdn[dot]ac[dot]lk 16/02/2020
+'''
+P=int(input())
+
+diff=[0]*(100000+1)
+
+for _ in range(P):
+	m,s,e=map(int,input().strip().split())
+
+	diff[s]+=m
+	diff[e+1]-=m
+
+pay=[0]*len(diff)
+
+pay[0]=diff[0]
+for i in range(1,len(pay)):
+	pay[i]=pay[i-1]+diff[i]
+
+print(max(pay))

codeBase/ACES_Coders/v8.0/coders/A-Mysterious-Bot/Readme.md

@@ -0,0 +1 @@
+The solution will be added later. Please contact sanoj.punchihewa[at]eng[dot]pdn[dot]ac[dot]lk for support.

codeBase/ACES_Coders/v8.0/coders/A-walk-to-remember/Solution.py

@@ -0,0 +1,23 @@
+'''
+	This solution was submitted by Team: eyeCoders_UOP 
+		during ACES Coders v8 2020 
+	Team lead: Rusiru Thushara thusharakart@gmail.com
+
+	The solution runs in O(n)
+'''
+def getline():return [float(x) for x in input().strip().split(' ')]
+c,e,n,s0 = getline()
+arr, lst = [], []
+m = c/s0
+for i in range(int(n)):
+    x,s = getline()
+    arr.append((x,s))
+    if x<c and s>=0:
+        m = max(m,(c-x)/s)
+    elif s<0:
+        lst.append((x,s))
+count = 0
+for x,s in lst:
+    if x+s*m <= c:
+        count+=1
+print(round(m),count)

codeBase/ACES_Coders/v8.0/coders/Basketball-tryouts/Readme.md

@@ -0,0 +1,13 @@
+# Basketball Tryouts - Solution 
+
+The constraints of the problem are,
+N < 500000
+D < 1000000
+
+For a solution to work in under 2 sec for C / 4 sec for JAVA or 10 sec for python, the solution ought to be of time complexity O(N log(N)) at worst.
+
+No team scored full marks for this question during the competition. But several users have scored full marks while upsolving the problem after the competition ended. These solutions are of order O(N^2). Apparently, it is possible to get full marks for this question even with an O(N^2) solution with several clever tweaks.
+
+O(N log(N)) Solution: Solution.cpp
+O(N^2) solutions : Solution_dtdinidu7.py , Solution_InterGreat_UOP.py
+

codeBase/ACES_Coders/v8.0/coders/Basketball-tryouts/Solution.cpp

@@ -0,0 +1,148 @@
+#include <iostream>
+#include <stdio.h>
+
+#include <algorithm>
+#include <iostream>
+#include <vector>
+using namespace std;
+
+
+bool DEBUG= false;
+
+vector<pair<int, int> > normalize(vector<pair<int, int> > v) {
+    vector<pair<int, int> > ret;
+    sort(v.begin(), v.end());
+    for (int i = 0; i < v.size(); i++) {
+        while (ret.size() && ret.back().first <= v[i].first &&
+               ret.back().second <= v[i].second) {
+            ret.pop_back();
+        }
+        ret.push_back(v[i]);
+    }
+    return ret;
+}
+
+vector<pair<int, int> > rev(vector<pair<int, int> > v) {
+    reverse(v.begin(), v.end());
+    for (int i = 0; i < v.size(); i++) v[i].first = -v[i].first;
+    for (int i = 0; i < v.size(); i++) v[i].second = -v[i].second;
+    return v;
+}
+
+long long solve(const vector<pair<int, int> >& a, int ai1, int ai2,
+               const vector<pair<int, int> >& b, int bi1, int bi2,
+               bool swapped) {
+    if (ai2-ai1 <= 50 || bi2-bi1 <= 50) {
+        long long ret = 0;
+        for (int i = ai1; i < ai2; i++)
+            for (int j = bi1; j < bi2; j++) {
+                if (swapped) {
+                    ret = max(ret, (long long)min(0, b[j].first-a[i].first) *
+                                   (b[j].second-a[i].second));
+                } else {
+                    ret = max(ret, (long long)max(0, b[j].first-a[i].first) *
+                                   (b[j].second-a[i].second));
+                }
+            }
+        return ret;
+    }
+
+    vector<pair<int, int> > b1, b2;
+    int i = (ai2+ai1)/2;
+    for (int j = bi1; j+1 < bi2; j += 2) {
+        long long v1 = (long long)(b[j].first-a[i].first) *
+                       (b[j].second-a[i].second);
+        long long v2 = (long long)(b[j+1].first-a[i].first) *
+                       (b[j+1].second-a[i].second);
+        if (v1 < v2) {
+            b1.push_back(b[j]); b1.push_back(b[j+1]); b2.push_back(b[j+1]);
+        } else {
+            b1.push_back(b[j]); b2.push_back(b[j]); b2.push_back(b[j+1]);
+        }
+    }
+    if ((bi2-bi1)%2) { b1.push_back(b[bi2-1]); b2.push_back(b[bi2-1]); }
+
+    return max(solve(b1, 0, b1.size(), a, ai1, i, !swapped),
+               solve(b2, 0, b2.size(), a, i, ai2, !swapped));
+}
+
+int main() {
+    int N, D;
+    scanf("%d %d",&N,&D);
+
+//    vector<pair<int, int> > A, C;
+
+    int ar_st[N];
+    int ar_en[N];
+    char ar_type[N];
+    int ar_score[N];
+
+    int countA=0,countB=0,countC=0;
+
+    long ansA,ansB=0,ansC=0;
+
+    int n=0;
+    for(n=0;n<N;n++){
+        int st,en,sc;
+        char type;
+        scanf("%d %d %c %d",&ar_st[n],&ar_en[n],&ar_type[n],&ar_score[n]);
+
+        if(ar_type[n]=='A')countA++;
+        if(ar_type[n]=='B')countB++;
+        if(ar_type[n]=='C')countC++;
+
+    }
+
+    if(DEBUG) {
+        for (n = 0; n < N; n++) {
+            printf("DEBUG: %d %d %c %d\n", ar_st[n], ar_en[n], ar_type[n], ar_score[n]);
+
+        }
+    }
+
+
+    vector<pair<int, int> > A(countA), C(countC);
+    countA=0,countB=0,countC=0;
+    for(n=0;n<N;n++){//buyers
+        if(ar_type[n]=='A'){
+            A[countA].first=ar_en[n]+1;
+            A[countA].second=ar_score[n];
+            ansA+=(ar_en[n]-ar_st[n]+1)*ar_score[n];
+
+            countA++;
+
+
+        } else if (ar_type[n]=='B'){
+            ansB+=(ar_en[n]-ar_st[n]+1)*ar_score[n];
+            countB++;
+        }else{//producers
+            C[countC].first=ar_st[n];
+            C[countC].second=ar_score[n];
+            ansC+=(ar_en[n]-ar_st[n]+1)*ar_score[n];
+            countC++;
+        }
+    }
+    if(DEBUG) {
+        printf("DEBUG: added.A %d addec.B %d added.C %d\n", countA, countB, countC);
+    }
+
+//    A = rev(normalize(rev(A)));
+//    C = normalize(C);
+
+    C=rev(normalize(rev(C)));
+    A=normalize(A);
+
+//    int ansAC=solve(A, 0, A.size(), C, 0, C.size(), false);
+
+    long ansAC=solve(C, 0, C.size(),A, 0, A.size(),  false);
+    if(DEBUG) {
+        printf("A:%ld B:%ld C:%ld\n", ansA, ansB, ansC);
+        printf("A+C:%ld\n", ansA + ansC);
+        printf("ACnew:%ld\n", ansAC);
+        printf("0LD:%ld NEW:%ld\n", ansA + ansB + ansC, ansA + ansB + ansC + ansAC);
+    }
+
+
+    printf("%ld %ld\n",ansA + ansB + ansC, ansA + ansB + ansC + ansAC);
+
+}

codeBase/ACES_Coders/v8.0/coders/Basketball-tryouts/Solution_InterGreat_UOP.py

@@ -0,0 +1,45 @@
+from collections import defaultdict
+
+def pair():
+    maxi = 0
+    for ele in As:
+        a = A[ele]
+        for eleC in Cs:
+            c = C[eleC]
+            val = (ele - eleC) * (a - c + 1)
+            if val > maxi:
+                maxi = val
+    return maxi
+
+N, D = list(map(int, input().split()))
+A = defaultdict()
+C = defaultdict()
+sA = 0
+sC = 0
+sB = 0
+numA = -1
+numC = -1
+for t in range(N):
+    t1, t2, t3, t4 = input().split()
+    t1 = int(t1)
+    t2 = int(t2)
+    t4 = int(t4)
+    if t3 == "A":
+        numA += 1
+        if (t4 not in A) or A[t4] < t2:
+            A[t4] = t2
+        sA += (t4 * t2)
+    elif t3 == "B":
+        sB += (t2 - t1 + 1) * t4
+    else:
+        numC += 1
+        if (t4 not in C) or C[t4] > t1:
+            C[t4] = t1
+        sC += (t2 - t1 + 1) * t4
+unpaired = sA + sB + sC
+As = A
+Cs = C
+# As = sorted(A.keys(), reverse = True)
+# Cs = sorted(C.keys())
+paired = pair()
+print(str(unpaired) + " " + str(unpaired + paired))

codeBase/ACES_Coders/v8.0/coders/Basketball-tryouts/Solution_dtdinidu7.py

@@ -0,0 +1,38 @@
+n, d = [int(i) for i in input().split()]
+
+A = {}
+C = {}
+
+shoots = 0
+
+def rangeD(e1, s2, e2):
+    tmp = min(e1, e2) - s2+1
+    return(tmp if tmp >= 0 else -1)
+
+for _ in range(n):
+    s, e, t, num = [i for i in input().split()]
+    s, e, num = int(s), int(e), int(num)
+    shoots += (e-s+1)*num
+    if (t == "A"):
+        if num in A:
+            A[num] = max(A[num], e)
+        else:
+            A[num] = e
+    elif (t == "C"):
+        if num in C:
+            C[num] = min(C[num], s)
+        else:
+            C[num] = s
+
+print(shoots, end = ' ')
+
+maxVal = 0
+
+for a in A:
+    for c in C:
+        if (a > c):
+            tmp = rangeD(A[a], C[c], d)
+            if not tmp == -1:
+                maxVal = max(maxVal, tmp*(a-c))
+
+print(shoots+maxVal)

codeBase/ACES_Coders/v8.0/coders/Dunder-Mifflin/Readme.md

@@ -0,0 +1 @@
+The solution will be added later. Please contact hishan.indrajith.adikari[at]eng[dot]pdn[dot]ac[dot]lk for support.

codeBase/ACES_Coders/v8.0/coders/Essence-scanner/sol.py

@@ -0,0 +1,87 @@
+# Problem setter's code
+# Author : harshana.w@eng.pdn.ac.lk
+def f(X,Y,M,_x,_y):
+    ret = 0
+    for i in range(len(X)):
+        d = (X[i]-_x)**2 + (Y[i]-_y)**2
+        d = d**0.5
+        ret += d*M[i]
+    return ret
+
+def geometricMedian(x, y, m): 
+    n = len(x)
+
+    # start assumption from Center of Mass
+    _x,_y = 0, 0
+    for i in range(n):
+        _x += x[i] * m[i]
+        _y += y[i] * m[i]
+    _x,_y = _x/sum(m),_y/sum(m)
+    opt_d = f(x,y,m,_x,_y) 
+
+
+    for i in range(n):
+        newd = f(x,y, m, x[i],y[i]) 
+        if (newd < opt_d): 
+            opt_d = newd
+            _x = x[i]
+            _y = y[i]
+
+    test_distance = 10**5
+
+    test_x = [-1,0,1,0]
+    test_y = [0,1,0,-1]
+    delta = 10**100
+    while (test_distance > lower_limit and delta > 1e-7):
+
+        flag = 0
+        for i in range(4):
+            newx = _x + test_distance * test_x[i]
+            newy = _y + test_distance * test_y[i] 
+            newd = f(x,y,m, newx,newy)  
+            if (newd < opt_d):
+                delta = opt_d - newd
+                opt_d = newd
+                _x = newx
+                _y = newy
+                # print("new loc {:.6f} {:.6f} d={:.6f} delta={:8f} testd={:.8f}".format(_x,_y,opt_d,delta,test_distance))
+                flag = 1 
+                break
+        if (flag == 0):
+            test_distance /= 2
+    return _x,_y
+
+lower_limit = 1e-5
+N,M = map(int,input().split())
+Xs,Ys = [],[]
+ms = []
+for i in range(N):
+    x,y,m = map(int,input().split())
+    Xs.append(x)
+    Ys.append(y)
+    ms.append(m)
+
+
+xC,yC = geometricMedian(Xs, Ys, ms)
+
+_x,_y = 0, 0
+for i in range(len(Xs)):
+    _x += Xs[i] * ms[i]
+    _y += Ys[i] * ms[i]
+_x,_y = _x/sum(ms),_y/sum(ms)
+
+
+Xs.append(0)
+Ys.append(0)
+ms.append(M)
+xH,yH = geometricMedian(Xs, Ys, ms)
+
+_x,_y = 0, 0
+for i in range(len(Xs)):
+    _x += Xs[i] * ms[i]
+    _y += Ys[i] * ms[i]
+_x,_y = _x/sum(ms),_y/sum(ms)
+
+
+print("{} {}".format(round(xC),round(yC)))
+print("{} {}".format(round(xH),round(yH)))

codeBase/ACES_Coders/v8.0/coders/Game-of-life/Readme.md

@@ -0,0 +1 @@
+The solution will be added later. Please contact suren.sri[at]eng[dot]pdn[dot]ac[dot]lk for support.