Compilare: user.cpp: In function ‘int main()’: user.cpp:141:18: warning: unused variable ‘c’ [-Wunused-variable] for (int a,b,c; m--;){ ^ user.cpp:156:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < rs.size();i++){ ^ user.cpp:138:9: warning: unused variable ‘a’ [-Wunused-variable] int a,b,c; ^ user.cpp:138:11: warning: unused variable ‘b’ [-Wunused-variable] int a,b,c; ^ user.cpp:138:13: warning: unused variable ‘c’ [-Wunused-variable] int a,b,c; ^