new file: P15254.cpp

P15254.cpp

@@ -0,0 +1,33 @@
+#include<bits/stdc++.h>
+using namespace std;
+int t,k;
+int n;
+char s[200005];
+int main(){
+    scanf("%d%d",&t,&k);
+    while(t--){
+        scanf("%d%s",&n,s);
+        bool flag=0;
+        vector<char> ans;
+        for(int i=n-1;i>=0;--i){
+            if((s[i]=='O'&&!flag) || (s[i]=='M' &&flag)){
+                ans.push_back('O');
+                flag=!flag;
+            }else{
+                ans.push_back('M');
+            }
+        }
+        puts("YES");
+        if(k==1){
+            for(int i=n-1;i>=0;--i){
+                putchar(ans[i]);
+            }
+            puts("");
+        }
+    }
+    return 0;
+}
+/*
+MOO
+MOO
+*/