minor cleanups

d01.cc

@@ -8,9 +8,8 @@ vector<unsigned> parse()
 {
     vector<unsigned> elves;
 
-    string line;
     unsigned elf = 0;
-    while (getline(cin, line)) {
+    for (string line; getline(cin, line);) {
         if (line.empty()) {
             elves.push_back(elf);
             elf = 0;

d02.cc

@@ -7,12 +7,11 @@ using namespace std;
 vector<array<unsigned, 2>> parse()
 {
     vector<array<unsigned, 2>> input;
-    string line;
-    while (getline(cin, line)) {
-        if (line.size() < 3 || line[1] != ' ') abort();
+    for (string line; getline(cin, line);) {
+        if (line.size() < 3 || line[1] != ' ') throw "parse";
         unsigned oppo = line[0] - 'A';
         unsigned user = line[2] - 'X';
-        if (oppo >= 3 || user >= 3) abort();
+        if (oppo >= 3 || user >= 3) throw "parse";
         input.push_back({oppo, user});
     }
     return input;
@@ -21,7 +20,7 @@ vector<array<unsigned, 2>> parse()
 unsigned p1(vector<array<unsigned, 2>> &input)
 {
     unsigned score = 0;
-    for (array<unsigned, 2> i : input) {
+    for (auto i : input) {
         unsigned shape = i[1];
         unsigned outcome = (i[1] - i[0] + 4) % 3;
         score += shape + 1 + outcome * 3;
@@ -32,7 +31,7 @@ unsigned p1(vector<array<unsigned, 2>> &input)
 unsigned p2(vector<array<unsigned, 2>> &input)
 {
     unsigned score = 0;
-    for (array<unsigned, 2> i : input) {
+    for (auto i : input) {
         unsigned shape = (i[1] + i[0] + 2) % 3;
         unsigned outcome = i[1];
         score += shape + 1 + outcome * 3;