diff --git a/CMakeLists.txt b/CMakeLists.txt
index 56840c1..dd96344 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,4 +26,6 @@ add_executable(P2615 ${CMAKE_CURRENT_LIST_DIR}/P2615/P2615.cpp)
 add_executable(P7076 ${CMAKE_CURRENT_LIST_DIR}/P7076/P7076.cpp)
 add_executable(P7075 ${CMAKE_CURRENT_LIST_DIR}/P7075/P7075.cpp)
 
-add_executable(P1003 ${CMAKE_CURRENT_LIST_DIR}/P1003/P1003.cpp)
\ No newline at end of file
+add_executable(P1003 ${CMAKE_CURRENT_LIST_DIR}/P1003/P1003.cpp)
+
+add_executable(P1311 ${CMAKE_CURRENT_LIST_DIR}/P1311/P1311.cpp)
\ No newline at end of file
diff --git a/P1003/P1003.cpp b/P1003/P1003.cpp
index abcc33e..632caf7 100644
--- a/P1003/P1003.cpp
+++ b/P1003/P1003.cpp
@@ -13,7 +13,6 @@ const int MAX_N = 1e4+5;
 int n;
 Point dir;
 Point arr[MAX_N][2];
-int ans;
 
 int main(){
     std::iostream::sync_with_stdio(false),cin.tie(nullptr),cout.tie(nullptr);
@@ -26,13 +25,11 @@ int main(){
     }
     cin>>dir.x>>dir.y;
 
-    for(const int i:range(0,n)){
-        if(arr[i][0].x<=dir.x && dir.x <= arr[i][1].x 
-        && arr[i][0].y<=dir.y && dir.y <= arr[i][1].y){
-            ans++;
+    for(int i=n-1;i>=0;i--){
+        if(arr[i][0].x<=dir.x && dir.x <= arr[i][0].x+arr[i][1].x 
+        && arr[i][0].y<=dir.y && dir.y <= arr[i][0].y+arr[i][1].y){
+            std::cout<<i+1<<"\n";
+            return 0;
         }
     }
-
-    std::cout<<(ans==0?-1:ans)<<"\n";
-
 }
\ No newline at end of file
diff --git a/P1311/P1311.cpp b/P1311/P1311.cpp
new file mode 100644
index 0000000..d795d8a
--- /dev/null
+++ b/P1311/P1311.cpp
@@ -0,0 +1,24 @@
+#include <cstddef>
+#include <iostream>
+#include <ranges>
+
+using std::iostream,std::cin,std::cout;
+constexpr const auto range = std::ranges::views::iota;
+
+const int MAX_N {(size_t)2e5+5},MAX_COLOR {50+5};
+int n,k,p;
+int ans;
+struct Hotel{
+    int color,min_cost;
+}hotel[MAX_N];
+
+int main(){
+    iostream::sync_with_stdio(false),cin.tie(nullptr),cout.tie(nullptr);
+
+    cin>>n>>k>>p;
+    for(const int i:range(1,n+1)){
+        cin>>hotel[i].color>>hotel[i].min_cost;
+    }
+    
+    
+}
\ No newline at end of file