Compilare: main.cpp: In function 'void back(int)': main.cpp:21:23: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 21 | if(med_ret[i][j]==1) | ^ main.cpp:34:22: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 34 | if(fr.count()==med) | ~~~~~~~~~~^~~~~