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@@ -0,0 +1,22 @@
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+#include <bits/stdc++.h>
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+using namespace std;
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+typedef long long LL;
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+
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+const int MAXN = 2e6 + 10;
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+LL a[MAXN];
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+
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+int main() {
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+ int n = 15;
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+ scanf("%d", &n);
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+ for (int i = 1; i <= n; i++)a[i] = i;
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+ partial_sum(a, a + n + 1, a);
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+ for (int i = 0; i <= n; i++) {
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+ LL x = a[i];
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+ LL key = x + n;
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+ int pos = lower_bound(a + i + 2, a + n + 1, key) - a;
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+ if (a[pos] == key) {
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+ printf("%d %d\n", i + 1, pos);
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+ }
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+ }
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+ return 0;
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+}
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