Compilare: main.cpp: In function 'int main()': main.cpp:25:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int k = 0; k < h[timp].size ( ); k++ ) ~~^~~~~~~~~~~~~~~~~~ main.cpp:40:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < h[i].size ( ); j++ ) ~~^~~~~~~~~~~~~~~