Compilare: main.cpp: In function 'int main()': main.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= e.size(); ++i) ~~^~~~~~~~~~~ main.cpp:29:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= s.size(); ++i) ~~^~~~~~~~~~~ main.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= e.size(); ++i) ~~^~~~~~~~~~~ main.cpp:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= s.size(); ++j) ~~^~~~~~~~~~~ main.cpp:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= s.size(); ++i) ~~^~~~~~~~~~~