Add 2015 sources

1 files changed, 23 insertions, 0 deletions

diff --git a/2015/day20.cpp b/2015/day20.cpp
new file mode 100644
index 0000000..2da1fa2
--- /dev/null
+++ b/2015/day20.cpp
@@ -0,0 +1,23 @@
+#include <iostream>
+#include <cstdlib>
+
+using namespace std;
+
+int main(void){
+	const int limit=10000000; //1e7
+	cerr<<"Alloc...";
+	int *scores=(int*)calloc(limit+1,sizeof(int));
+	cerr<<" done."<<endl;
+	int elf,i,ilimit;
+	for(elf=1;elf<=limit;elf++){
+		ilimit=limit/elf;
+		if(ilimit>50)ilimit=50;
+		for(i=1;i<=ilimit;i++){
+			scores[elf*i]+=elf*11;
+		}
+		if(scores[elf]>=36000000)break;
+	}
+	for(i=1;i<20;i++)cout<<scores[i]<<' '; cout<<endl;
+	cout<<elf<<endl;
+	free(scores);
+}