Compilare: main.cpp: In function 'void bck(int, int)': main.cpp:26:29: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | for(int j=0;j<v[ch].size() && !poz;j++) | ^~ main.cpp:26:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int j=0;j<v[ch].size() && !poz;j++) | ~^~~~~~~~~~~~~ main.cpp:27:22: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | if(v[ch][j]==i) | ^~ main.cpp:29:33: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | for(int j=poz+1;j<v[ch].size() && ok;j++) | ^~ main.cpp:29:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int j=poz+1;j<v[ch].size() && ok;j++) | ~^~~~~~~~~~~~~ main.cpp:31:25: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | int a=v[ch][j-1]; | ^~ main.cpp:32:25: warning: array subscript has type 'char' [-Wchar-subscripts] 32 | int b=v[ch][j]; | ^~ main.cpp:46:27: warning: array subscript has type 'char' [-Wchar-subscripts] 46 | viz[v[ch][j]]=1; | ^~ main.cpp:52:27: warning: array subscript has type 'char' [-Wchar-subscripts] 52 | viz[v[ch][j]]=0; | ^~ main.cpp: In function 'int main()': main.cpp:69:14: warning: array subscript has type 'char' [-Wchar-subscripts] 69 | v[t[i]].push_back(l); | ~~~^