Compilare: main.cpp: In function 'int tmin(int)': main.cpp:34:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<data>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(i=0;i<l[x].size();i++) { | ~^~~~~~~~~~~~ main.cpp:37:21: warning: unused variable 'nr' [-Wunused-variable] 37 | int nr=y-l[x][i].c2; | ^~ main.cpp:35:17: warning: unused variable 'nr' [-Wunused-variable] 35 | int nr=l[x][i].c2; | ^~