Compilare: main.cpp: In function 'int main()': main.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= e.size(); ++i) ~~^~~~~~~~~~~ main.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= s.size(); ++i) ~~^~~~~~~~~~~ main.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= e.size(); ++i) ~~^~~~~~~~~~~ main.cpp:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= e.size(); ++i) ~~^~~~~~~~~~~ main.cpp:52:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= s.size(); ++j) ~~^~~~~~~~~~~