2022/city/11/expresii solution

2022/city/11/expresii/expresii.cpp

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+#include <bits/stdc++.h>
+
+using namespace std;
+
+// ifstream in("test.in");
+// ofstream out("test.out");
+
+struct Consumer {
+    int consumed;
+    string name;
+
+    bool operator<(const Consumer& other) {
+        // First compare x, then y
+        return consumed < other.consumed;
+    }
+};
+
+int convert(string roman) {
+    unordered_map<char, int> numMapping;
+    numMapping['I'] = 1;
+    numMapping['V'] = 5;
+    numMapping['X'] = 10;
+    numMapping['L'] = 50;
+    numMapping['C'] = 100;
+    numMapping['D'] = 500;
+    numMapping['M'] = 1000;
+    
+    
+    if (!roman.size()) {
+        return 0;
+    }
+
+    int total = 0;
+    int checkpoint = numMapping[roman[0]];
+    int stretchTotal = 0;
+
+    for (int j = 0; j < roman.size(); j++) {
+        int charDex = numMapping[roman[j]];
+        if (charDex == checkpoint) {
+            stretchTotal += charDex;
+        } else if (charDex > checkpoint) {
+            total += charDex - stretchTotal;
+            checkpoint = charDex;
+            stretchTotal = 0;
+        } else {
+            total += stretchTotal;
+            checkpoint = charDex;
+            stretchTotal = charDex;
+        }
+    }
+    total += stretchTotal;
+    return total;
+}
+
+
+int main(int argc, char *argv[]) {
+    string inName = "test.in";
+    string outName = "test.out";
+    
+    if (argc > 1) {
+        inName = argv[1];
+        cout << "Using \"" << inName << "\" for test name" << endl;
+    } else {
+        cout << "Warning: no in name provided, defaulting to test.in" << endl;
+    }
+
+    if (argc > 2) {
+        outName = argv[2];
+        cout << "Using \"" << outName << "\" for out name" << endl;
+    } else {
+        cout << "Warning: no out name proviced, defaulting to test.out" << endl;
+    }
+
+    ifstream in(inName);
+    ofstream out(outName);
+
+    string expression = "";
+    string roman = "";
+    int total = 0;
+    char nextOperation = '0';  // also serves as first number flag
+    #define isFirstNumber nextOperation == '0'
+    #define isSubtract nextOperation == '-'
+    #define isSum nextOperation == '+'
+
+    char ch;
+    while (in.get(ch)) {
+        if (ch == '+' || ch == '-') {
+            if (isFirstNumber || isSum) {
+                total += convert(roman);
+            } else {
+                total -= convert(roman);
+            }
+            nextOperation = ch;
+            roman = "";
+
+            continue;
+        }
+
+        roman += ch;
+    }
+    if (isFirstNumber || isSum) {
+        total += convert(roman);
+    } else {
+        total -= convert(roman);
+    }
+    out << total << endl;
+
+    return 0;
+}