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CF47A Triangular numbers
R39546073
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5
.vscode/settings.json
vendored
5
.vscode/settings.json
vendored
@ -70,6 +70,9 @@
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"streambuf": "cpp",
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"thread": "cpp",
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"typeindex": "cpp",
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"typeinfo": "cpp"
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"typeinfo": "cpp",
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"any": "cpp",
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"bit": "cpp",
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"variant": "cpp"
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}
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}
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17
problem/CF47A/CF47A.cpp
Normal file
17
problem/CF47A/CF47A.cpp
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@ -0,0 +1,17 @@
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n;
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cin >> n;
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for (int i = 1; i <= n; i++) {
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if ((i + 1) * i * 0.5 == n) {
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cout << "YES" << endl;
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goto end;
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}
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}
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cout << "NO" << endl;
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end:;
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return 0;
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}
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