Compilare: user.cpp: In function ‘int main()’: user.cpp:94:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ; h < frec[i].size() ; h++){ ~~^~~~~~~~~~~~~~~~ user.cpp:100:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ; h < frec[i - d].size() ; h++) { ~~^~~~~~~~~~~~~~~~~~~~ user.cpp:104:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ; h < frec[i].size() ; h++) ~~^~~~~~~~~~~~~~~~ user.cpp:106:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ; h < frec[i].size() ; h++){ ~~^~~~~~~~~~~~~~~~