Compilare: main.cpp: In function 'int main()': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp:27:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (isdigit(s[i]) && i < s.size()) ~~^~~~~~~~~~ main.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (isalpha(s[i]) && i < s.size()) ~~^~~~~~~~~~ main.cpp:41:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (isdigit(s[i]) && i < s.size()) ~~^~~~~~~~~~ main.cpp:44:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (nr) ing.push_back(make_pair(aux, nr)); --i; ^~ main.cpp:44:52: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if (nr) ing.push_back(make_pair(aux, nr)); --i; ^~ main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < ing.size(); ++i) ~~^~~~~~~~~~~~ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ing.size(); ++i) ~~^~~~~~~~~~~~