diff --git a/histogram.cpp b/histogram.cpp
index 46c6086..c8330f7 100644
--- a/histogram.cpp
+++ b/histogram.cpp
@@ -18,6 +18,13 @@ bool find_minmax(vector<double> vec, double& min, double& max) {
     }
     return true;
 }
+
+bool width(size_t  block_width){
+     if (block_width > 3 && block_width<30 ) {
+            return true;
+  }
+}
+
 vector<size_t> make_histogram(size_t number, vector<double> vec) {
     vector<size_t> bins(number);
     double mn, mx;
diff --git a/histogram.h b/histogram.h
index 92a9d68..4267de0 100644
--- a/histogram.h
+++ b/histogram.h
@@ -4,3 +4,4 @@
 using namespace std;
 vector<size_t> make_histogram(size_t number, vector<double> vec);
 
+bool width(size_t block_width);
diff --git a/histogram_internal.h b/histogram_internal.h
index 72bf28b..3d4f536 100644
--- a/histogram_internal.h
+++ b/histogram_internal.h
@@ -1 +1,2 @@
 bool find_minmax(std::vector<double> vec, double& min, double& max);
+bool width(size_t block_width);
diff --git a/main.cpp b/main.cpp
index 70445d7..57e7695 100644
--- a/main.cpp
+++ b/main.cpp
@@ -37,6 +37,7 @@ Input input_data() {
     return in;
 }
 
+
 int main() {
     auto in = input_data();
     auto bins = make_histogram(in.korz, in.vec);
diff --git a/svg.cpp b/svg.cpp
index a697b75..f79d6f7 100644
--- a/svg.cpp
+++ b/svg.cpp
@@ -1,6 +1,6 @@
 #include "svg.h"
 
-using namespace std;
+
 
 void svg_begin(double width, double height) {
     cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
diff --git a/unittest.cpp b/unittest.cpp
index b5788fe..933c77a 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -21,6 +21,9 @@ TEST_CASE("empty vector"){
     CHECK(!result);
 }
 
+
+
+
 TEST_CASE("single vector"){
     double min = 0;
     double max = 0;
@@ -47,3 +50,17 @@ TEST_CASE("same vector"){
     CHECK(min == 1);
     CHECK(max == 1);
 }
+
+TEST_CASE("block"){
+    size_t block_width = 15;
+    bool result = width( block_width);
+        CHECK(result);
+}
+
+
+TEST_CASE("block"){
+    size_t block_width = 0;
+    bool result = width( block_width);
+        CHECK(!result);
+}
+
diff --git a/unittest.depend b/unittest.depend
index 914d5b4..66b0e9d 100644
--- a/unittest.depend
+++ b/unittest.depend
@@ -1,12 +1,12 @@
 # depslib dependency file v1.0
-1746274971 source:c:\users\natasha\desktop\Проги С2\cs-lab34\histogram.cpp
+1746447381 source:c:\users\natasha\desktop\Проги С2\cs-lab34\histogram.cpp
 	"histogram.h"
 
-1746274971 c:\users\natasha\desktop\Проги С2\cs-lab34\histogram.h
+1746446253 c:\users\natasha\desktop\Проги С2\cs-lab34\histogram.h
 	<vector>
 	<iostream>
 
-1746276122 source:c:\users\natasha\desktop\Проги С2\cs-lab34\unittest.cpp
+1746447498 source:c:\users\natasha\desktop\Проги С2\cs-lab34\unittest.cpp
 	"doctest.h"
 	"histogram_internal.h"
 
@@ -55,5 +55,5 @@
 	<sys/time.h>
 	<unistd.h>
 
-1746276025 c:\users\natasha\desktop\Проги С2\cs-lab34\histogram_internal.h
+1746447065 c:\users\natasha\desktop\Проги С2\cs-lab34\histogram_internal.h