Compilare: main.cpp: In function 'int main()': main.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ~^~~~~~~~~~~ main.cpp:35:9: warning: unused variable 't' [-Wunused-variable] int t,i,op,x,y; ^ main.cpp:35:11: warning: unused variable 'i' [-Wunused-variable] int t,i,op,x,y; ^ main.cpp:35:13: warning: unused variable 'op' [-Wunused-variable] int t,i,op,x,y; ^~ main.cpp:35:16: warning: unused variable 'x' [-Wunused-variable] int t,i,op,x,y; ^ main.cpp:35:18: warning: unused variable 'y' [-Wunused-variable] int t,i,op,x,y; ^