feat: solved day 20 hard

hard/day_20/solution.cpp

@@ -1 +1,105 @@
-//write your code here
+//write your code here
+//Code by Jagpreet153
+#include <bits/stdc++.h>
+using namespace std;
+void imp() {
+	cout << "IMPOSSIBLE" << endl;
+	exit(0);
+}
+int main () {
+	int n,m,a,b,c;
+	cin >> n >> m >> a >> b >> c;
+	if (n%2==1 && m%2==1) imp();
+	if (a*2+b*2+c*4<n*m) imp();
+	if (n%2==1 && a<m/2) imp();
+	if (m%2==1 && b<n/2) imp();
+	bool swp=0;
+	if (m%2==1) 
+    {
+		swp=1;
+		swap(n,m);
+		swap(a,b);
+	}
+	vector<string> res(n,string(m,0));
+	for (int i=0;i<n/2;i++)
+		for (int j=0;j<m/2;j++) 
+        {
+			vector<bool> used(20,0);
+			if (i>0)
+            used[res[i*2-1][j*2]]=1;
+			if (i>0)
+            used[res[i*2-1][j*2+1]]=1;
+			if (j>0)
+            used[res[i*2][j*2-1]]=1;
+			if (j>0)
+            used[res[i*2+1][j*2-1]]=1;
+			int fu=0;
+			while (used[fu]) 
+            fu++;
+			used[fu]=1;
+			int su=0;
+			while (used[su]) 
+            su++;
+			if (c>0) 
+            {
+				res[i*2][j*2]=fu;
+				res[i*2][j*2+1]=fu;
+				res[i*2+1][j*2]=fu;
+				res[i*2+1][j*2+1]=fu;
+				c--;
+			}
+             else if (b>1) 
+             {
+				res[i*2][j*2]=fu;
+				res[i*2][j*2+1]=su;
+				res[i*2+1][j*2]=fu;
+				res[i*2+1][j*2+1]=su;
+				b-=2;
+			} 
+            else if (a>1) 
+            {
+				res[i*2][j*2]=fu;
+				res[i*2][j*2+1]=fu;
+				res[i*2+1][j*2]=su;
+				res[i*2+1][j*2+1]=su;
+				a-=2;
+			} 
+            else imp();
+		}
+	if (n%2==1) 
+    {
+		for (int i=0;i<m/2;i++) 
+        {
+			vector<bool> used(20,0);
+			if (i>0)
+            used[res[n-1][i*2-1]]=1;
+			if (n>1)
+            used[res[n-2][i*2]]=1;
+			if (n>1)
+            used[res[n-2][i*2+1]]=1;
+			int fu=0;
+			while (used[fu]) 
+            fu++;
+			if (a>0) 
+            {
+				res[n-1][i*2]=fu;
+				res[n-1][i*2+1]=fu;
+				a-=1;
+			} 
+            else imp();
+		}
+	}
+	if (swp) 
+    swap(n,m);
+	for (int i=0;i<n;i++) 
+    {
+		for (int j=0;j<m;j++) 
+        {
+			if (swp)
+				cout << char(res[j][i]+'a');
+			else
+				cout << char(res[i][j]+'a');
+		}
+		cout << endl;
+	}
+}