添加了许多代码文件

「NOIP 2015普及组」金币.cpp

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+#include <iostream>
+#include <cmath>
+using namespace std;
+int main(){
+	int a,b=1,sum=0;
+	cin >>a;
+	while(a>b){
+		sum+=b*b;
+		a-=b;
+		b++;
+	}
+	sum+=b*a;
+	cout <<sum;
+	return 0;
+}
+
+