Compilare: main.cpp: In function 'int main()': main.cpp:39:41: warning: comparison of integer expressions of different signedness: 'std::map<long long int, long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 39 | while (st < n && fst.size() < l) | ~~~~~~~~~~~^~~ main.cpp:41:41: warning: comparison of integer expressions of different signedness: 'std::map<long long int, long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 41 | while (dr < n && fdr.size() < u) | ~~~~~~~~~~~^~~ main.cpp:44:28: warning: comparison of integer expressions of different signedness: 'std::map<long long int, long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 44 | if (fdr.size() >= l && fdr.size() <= u) | ~~~~~~~~~~~^~~~ main.cpp:44:47: warning: comparison of integer expressions of different signedness: 'std::map<long long int, long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 44 | if (fdr.size() >= l && fdr.size() <= u) | ~~~~~~~~~~~^~~~ main.cpp:44:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 44 | if (fdr.size() >= l && fdr.size() <= u) | ^