Compilare: main.cpp: In function 'int main()': main.cpp:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(s); i++) ~~^~~~~~~~~~~ main.cpp:49:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sum > k) ~~~~^~~ main.cpp:52:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sum - v[int(s[i]) - int('a')] > k - 3 && i >= 0) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~