Compilare: main.cpp: In function 'bool exista(int)': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < h[k].size(); i ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = n; i < strlen(s); i ++) { ~~^~~~~~~~~~~ main.cpp:46:9: warning: unused variable 'i' [-Wunused-variable] int i = n; ^