Main.cc: In function ‘std::vector > get_union(std::vector >)’: Main.cc:15:12: error: missing template arguments before ‘merged’ vector merged(n, false); ^~~~~~ Main.cc:19:18: error: ‘merged’ was not declared in this scope if (!merged[j] && P[i].second >= P[j].first) { ^~~~~~ Main.cc:19:18: note: suggested alternative: ‘mbrlen’ if (!merged[j] && P[i].second >= P[j].first) { ^~~~~~ mbrlen Main.cc:29:14: error: ‘merged’ was not declared in this scope if (!merged[i]) ^~~~~~ Main.cc:29:14: note: suggested alternative: ‘mbrlen’ if (!merged[i]) ^~~~~~ mbrlen Main.cc: In function ‘int main()’: Main.cc:65:25: error: ‘ssize’ was not declared in this scope for (int i = 0; i < ssize(X); ++i) { ^~~~~ Main.cc:65:25: note: suggested alternative: ‘size’ for (int i = 0; i < ssize(X); ++i) { ^~~~~ size