Compilare: user.cpp: In function ‘bool verif(int, int, int)’: user.cpp:47:13: warning: unused variable ‘ok’ [-Wunused-variable] int ok=0; ^ user.cpp:55:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[l][c].size() ; i++) ^ user.cpp: In function ‘int main()’: user.cpp:104:17: warning: unused variable ‘ok’ [-Wunused-variable] int ok=0; ^ user.cpp:82:9: warning: unused variable ‘in’ [-Wunused-variable] int in=1; ^ user.cpp:93:9: warning: unused variable ‘sf’ [-Wunused-variable] int sf=1; ^