Upload ABC400 codes

AtCoder/ABC_400/B.cpp

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+#include <bits/stdc++.h>
+#define lo long long
+#define INF INT_MAX
+#define LLM LONG_LONG_MAX
+#define endl "\n"
+
+using namespace std;
+/*
+    toothless. #17
+    @fredcss_dev
+*/
+
+signed main() {
+    int N, M;
+    cin >> N >> M;
+    
+    if (N == 1) {
+        lo total = M + 1LL;
+        if (total > 1e9) {
+            cout << "inf" << endl;
+        } else {
+            cout << total << endl;
+        }
+    } else {
+        lo sum = 0;
+        lo cur = 1;
+        bool f = false;
+        for (int i = 0; i <= M; ++i) {
+            sum += cur;
+            if (sum > 1e9) {
+                f = true;
+                break;
+            }
+            if (i == M) {
+                break;
+            }
+            if (cur > 1e9 / N) {
+                f = true;
+                break;
+            }
+            lo next = cur * N;
+            if (next > (1e9 - sum)) {
+                f = true;
+                break;
+            }
+            cur = next;
+        }
+        if (f) {
+            cout << "inf" << endl;
+        } else {
+            cout << sum << endl;
+        }
+    }
+    return 0;
+}