Compilare: main.cpp: In function 'void pre()': main.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fisiere.size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp:29:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < fisiere[i].length(); j++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:30:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = j; k < fisiere[i].length(); k++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:42:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fisiere.size(); i++) { ~~^~~~~~~~~~~~~~~~ main.cpp:50:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fisiere.size(); i++) { ~~^~~~~~~~~~~~~~~~