Compilare: main.cpp: In function 'void solve2()': main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(s); ++i) ~~^~~~~~~~~~~ main.cpp: In function 'void charlie()': main.cpp:42:18: warning: array subscript is above array bounds [-Warray-bounds] o[i - '0'] = contor++; ~~~~~~~~~^ main.cpp: In function 'void solve2()': main.cpp:42:18: warning: array subscript is above array bounds [-Warray-bounds] o[i - '0'] = contor++; ~~~~~~~~~^