diff --git a/README.md b/README.md
index a5ed85f..acbd875 100644
--- a/README.md
+++ b/README.md
@@ -117,4 +117,7 @@ ll ksm(ll a,ll b,ll M){
 [树状数组PDF](./day11/FenwickTree/FenwickTree.pdf)
 
 ## Day12
->二分图，染色，BFS遍历
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+>二分图，染色，BFS遍历
+
+## Day13
+>单调队列
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diff --git a/day13/P1049/P1049.cpp b/day13/P1049/P1049.cpp
new file mode 100644
index 0000000..9d96f53
--- /dev/null
+++ b/day13/P1049/P1049.cpp
@@ -0,0 +1,22 @@
+#include <cctype>
+#include <cstdio>
+using namespace std;
+
+
+int main(){
+
+}
+
+int readint(){
+    int x=0,w=1;
+    char ch=0;
+    while(!isdigit(ch)){
+        if(ch=='-')w=-1;
+        ch=getchar();
+    }
+    while(isdigit(ch)){
+        x=x*10+(ch-'0');
+        ch=getchar();
+    }
+    return x*w;
+}
\ No newline at end of file
diff --git a/xmake.lua b/xmake.lua
index 8b2060b..8419719 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -161,4 +161,8 @@ target("P1833")
 
 target("P1855")
     set_rundir("day13/P1855")
-    add_files("day13/P1855/*.cpp")
\ No newline at end of file
+    add_files("day13/P1855/*.cpp")
+
+target("P1049")
+    set_rundir("day13/P1049")
+    add_files("day13/P1049/P1049.cpp")
\ No newline at end of file