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SOLUTIONS/robo.cpp

@@ -0,0 +1,65 @@
+#include<iostream>
+#include<string>
+using namespace std;
+int main()
+{
+	long tc;
+	int i, j, dot, num, len, flag,l, k;
+	string s;
+	cin>>tc;
+	while(tc--)
+	{
+		k = 0;
+		dot = 0;
+		num = 0;
+		flag = 0;
+		cin>>s;
+		len = s.length();
+		int d[100], index[100];
+		for(i = 0; i < len; i++)
+		{
+			if(s[i] == '.')
+				dot++;
+			else
+			{
+				num++;
+			}
+		}
+		if(dot == len)
+			cout<<"safe"<<endl;
+		else if(num == 1)
+			cout<<"safe"<<endl;
+		else
+		{
+			for(i = 0; i < len; i++)
+			{
+				if(s[i] != '.')
+				{
+					d[k] = s[i]-'0';
+					index[k] = i;
+					k++;
+				}
+			}
+			for(l = 0; l < k; l++)
+			{
+				for(j = index[l] - d[l]; j <= index[l] + d[l] && j < len; j++)
+				{
+					if(j < 0)
+						continue;
+					if(s[j] == -100)
+					{
+							flag = 1;
+							break;
+					}
+					s[j] = -100;
+				}
+			}
+			/*for(i = 0; i < len; i++)
+				cout<<s[i]<<endl;*/
+			if(flag == 1)
+				cout<<"unsafe"<<endl;
+			else
+				cout<<"safe"<<endl;
+		}
+	}
+}