Compilare: main.cpp: In function 'void edist()': main.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= s1.size(); ++i) { ~~^~~~~~~~~~~~ main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= s2.size(); ++i) { ~~^~~~~~~~~~~~ main.cpp:24:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= s1.size(); ++i) { ~~^~~~~~~~~~~~ main.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= s2.size(); ++j) { ~~^~~~~~~~~~~~