Compilare: user.cpp: In function ‘void path(int, int)’: user.cpp:50:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘double minEff(std::vector<int>)’: user.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<=a.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:114:44: warning: narrowing conversion of ‘t’ from ‘int’ to ‘char’ inside { } [-Wnarrowing] p[i][j]={t,k}; ^ user.cpp:114:44: warning: narrowing conversion of ‘k’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] user.cpp:122:48: warning: narrowing conversion of ‘t’ from ‘int’ to ‘char’ inside { } [-Wnarrowing] p[i][j]={t,k}; ^ user.cpp:122:48: warning: narrowing conversion of ‘k’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] user.cpp:145:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<srt.size();i++) ^ user.cpp:156:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<solution.size();i++) ^