Compilare: main.cpp: In function 'void F()': main.cpp:18:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int j=0;j<vec1[i].size();j++) | ~^~~~~~~~~~~~~~~ main.cpp:23:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int j=0;j<vec2[i].size();j++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'void Back(int)': main.cpp:33:35: warning: array subscript has type 'char' [-Wchar-subscripts] 33 | if(p[i]==0 && (i!=0 || nu[v2[k+1]]!=1)) | ~~~~~~^ main.cpp:35:12: warning: array subscript has type 'char' [-Wchar-subscripts] 35 | v[v2[k+1]]=i; | ~~~~~~^ main.cpp: In function 'int main()': main.cpp:47:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 47 | if(x[i].size()>max1)max1=x[i].size(); | ~~~~~~~~~~~^~~~~ main.cpp:51:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 51 | if(y[i].size()>max2)max2=y[i].size(); | ~~~~~~~~~~~^~~~~ main.cpp:55:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | {for(int j=0;j<x[i].size();j++) | ~^~~~~~~~~~~~ main.cpp:60:43: warning: array subscript has type 'char' [-Wchar-subscripts] 60 | if(j==0 && x[i].size()!=1)nu[x[i][j]]=1; | ^ main.cpp:64:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | {for(int j=0;j<y[i].size();j++) | ~^~~~~~~~~~~~ main.cpp:69:43: warning: array subscript has type 'char' [-Wchar-subscripts] 69 | if(j==0 && y[i].size()!=1)nu[y[i][j]]=1; | ^