Compilare: main.cpp: In function 'int main()': main.cpp:47:26: warning: variable 'f' set but not used [-Wunused-but-set-variable] char f=sol1[0]; ^ main.cpp:62:26: warning: variable 'f' set but not used [-Wunused-but-set-variable] char f=sol1[0]; ^ main.cpp:74:26: warning: unused variable 'f' [-Wunused-variable] char f=sol1[0]; ^ main.cpp:121:26: warning: variable 'f' set but not used [-Wunused-but-set-variable] char f=sol1[0]; ^ main.cpp:136:26: warning: variable 'f' set but not used [-Wunused-but-set-variable] char f=sol1[0]; ^ main.cpp:148:26: warning: unused variable 'f' [-Wunused-variable] char f=sol1[0]; ^ main.cpp:164:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol1.size()<l){ ^