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pojcs101_M02692_12_coins.cpp

@@ -0,0 +1,65 @@
+#include <cstring>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+void solveGroup() {
+    bool tempList[12] = {false};
+    bool realCoins[12] = {false};
+    vector<pair<string, string> > lighterResults;
+    for (int _ = 0; _ < 3; _++) {
+        string s1, s2, comparison;
+        cin >> s1 >> s2 >> comparison;
+        if (comparison == "even") {
+            for (const char c: s1 + s2) {
+                realCoins[c - 'A'] = true;
+            }
+        } else {
+            memset(tempList, false, sizeof(tempList));
+            for (const char c: s1 + s2) { tempList[c - 'A'] = true; }
+            for (int i = 0; i < 12; i++) {
+                if (!tempList[i]) { realCoins[i] = true; }
+            }
+
+            if (comparison == "down") {
+                lighterResults.emplace_back(s2, s1);
+            } else {
+                lighterResults.emplace_back(s1, s2);
+            }
+        }
+    }
+    for (int i = 0; i < 12; i++) {
+        if (realCoins[i]) continue;
+        int conclusion = 0;
+        for (const auto &[s1, s2]: lighterResults) {
+            if (s1.find(static_cast<char>(i + 'A')) != string::npos) {
+                if (conclusion == 1) {
+                    conclusion = -2;
+                    break;
+                }
+                conclusion = -1;
+            } else if (s2.find(static_cast<char>(i + 'A')) != string::npos) {
+                if (conclusion == -1) {
+                    conclusion = -2;
+                    break;
+                }
+                conclusion = 1;
+            }
+        }
+        if (conclusion == -2 || conclusion == 0) { continue; }
+        cout << static_cast<char>(i + 'A') << " is the counterfeit coin and it is "
+                << (conclusion == 1 ? "light." : "heavy.") << endl;
+    }
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+    int n;
+    cin >> n;
+    for (int _ = 0; _ < n; _++) {
+        solveGroup();
+    }
+    return 0;
+}