diff --git a/src/P1972/P1972.cpp b/src/P1972/P1972.cpp
new file mode 100644
index 0000000..5290188
--- /dev/null
+++ b/src/P1972/P1972.cpp
@@ -0,0 +1,81 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <istream>
+
+using ll = int64_t;
+using std::cin, std::cout;
+
+const ll maxn = 1e6+5;
+ll n, kds[maxn], m, anss[maxn], viss[maxn], bits[maxn];
+
+struct Sch{
+    ll l, r, pos;
+}schs[maxn];
+
+ll lb(const ll &v){
+    return v&(-v);
+}
+
+void tadd(ll idx, const ll &v){
+    while(idx<=n){
+        bits[idx]+=v;
+        idx+=lb(idx);
+    }
+}
+
+ll tpsch(ll idx){
+    ll res{};
+    while(idx!=0){
+        res+=bits[idx];
+        idx-=lb(idx);
+    }
+    return res;
+}
+
+#define DB(v){cout<<#v<<": "<<(v)<<'\n';};
+
+int main(){
+    std::iostream::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
+
+    cin>>n;
+    for(ll i{1};i<=n;i++){
+        cin>>kds[i];
+    }
+    cin>>m;
+    for(ll i{1};i<=m;i++){
+        cin>>schs[i].l>>schs[i].r;
+        schs[i].pos=i;
+    }
+    std::sort(schs+1, schs+1+m, [](const Sch &a, const Sch &b)->bool{
+        return a.r<b.r;
+    });
+    ll nm{1};
+    for(ll i{1};i<=n;i++){
+        if((bool)viss[kds[i]]){
+            tadd(viss[kds[i]], -1);
+            viss[kds[i]]=i;
+            tadd(i, 1);
+        }else{
+            viss[kds[i]]=i;
+            tadd(i, 1);
+        }
+        if(i==schs[nm].r){
+            // cout<<"{ ";
+            // for(ll i{1}; i<=schs[nm].r; i++){
+            //     cout<<tpsch(i)-tpsch(i-1)<<", ";
+            // }
+            // cout<<"}\n";
+            // DB(schs[nm].pos)
+            // DB(tpsch(schs[nm].l-1));
+            // DB(tpsch(schs[nm].r))
+            
+            anss[schs[nm].pos] = tpsch(schs[nm].r) - tpsch(schs[nm].l-1);
+            if(nm==m)break;
+            nm++;
+        }
+    }
+    for(ll i{1};i<=m;i++){
+        cout<<anss[i]<<'\n';
+    }
+}
\ No newline at end of file
diff --git a/src/P1972/P1972_1.in b/src/P1972/P1972_1.in
new file mode 100644
index 0000000..0d08b6b
--- /dev/null
+++ b/src/P1972/P1972_1.in
@@ -0,0 +1,3003 @@
+5000
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diff --git a/src/P1972/P1972_1.out b/src/P1972/P1972_1.out
new file mode 100644
index 0000000..4b32932
--- /dev/null
+++ b/src/P1972/P1972_1.out
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diff --git a/test.cpp b/test.cpp
deleted file mode 100755
index e69de29..0000000