Compilare: main.cpp: In function 'int main()': main.cpp:134:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | for(i=0;i<c1[0].size();i++) | ~^~~~~~~~~~~~~ main.cpp:139:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 139 | for(i=0;i<c2[0].size();i++) | ~^~~~~~~~~~~~~ main.cpp:144:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 144 | for(i=0;i<l1[0].size();i++) | ~^~~~~~~~~~~~~ main.cpp:149:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 149 | for(i=0;i<l2[0].size();i++) | ~^~~~~~~~~~~~~ main.cpp:30:26: warning: unused variable 'sol' [-Wunused-variable] 30 | int ok=0,nr1,nr2,i,j,sol,x,y; | ^~~ main.cpp:30:30: warning: variable 'x' set but not used [-Wunused-but-set-variable] 30 | int ok=0,nr1,nr2,i,j,sol,x,y; | ^ main.cpp:30:32: warning: variable 'y' set but not used [-Wunused-but-set-variable] 30 | int ok=0,nr1,nr2,i,j,sol,x,y; | ^