Compilare: main.cpp: In function 'bool exista(unsigned 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 'void citire()': main.cpp:27:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; i ++) ~~^~~ main.cpp: In function 'int main()': main.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < n; i ++) ~~^~~ main.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; i ++) { ~~^~~ main.cpp:50:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < strlen(s)) { ~~^~~~~~~~~~~