2023 day 1: add C++ solution

2023/1/main.cpp

@@ -0,0 +1,60 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+const string NUMBERS[] = {
+	"one",
+	"two",
+	"three",
+	"four",
+	"five",
+	"six",
+	"seven",
+	"eight",
+	"nine",
+};
+
+int main() {
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+
+	int ret = 0;
+
+	string line;
+	for (;;) {
+		getline(cin, line);
+		if (cin.eof())
+			break;
+
+		int pi = INT_MAX, pl = -1, vi = 0, vl = 0;
+		for (int i = 0; i < line.size(); i++) {
+			unsigned char c = line[i] - '0';
+			if (c <= 9) {
+				if (vi == 0) {
+					pi = i;
+					vi = c;
+				}
+				pl = i;
+				vl = c;
+			}
+		}
+		for (int n = 1; n <= 9; n++) {
+			const auto strn = NUMBERS[n - 1];
+			int i = 0;
+			int posi = line.find(strn);
+			if (posi == string::npos)
+				continue;
+			int posl = line.rfind(strn);
+			if (posi < pi) {
+				pi = posi;
+				vi = n;
+			}
+			if (posl > pl) {
+				pl = posl;
+				vl = n;
+			}
+		}
+		ret += vi * 10 + vl;
+	}
+
+	cout << ret << '\n';
+}