Compilare: user.cpp: In function ‘int main()’: user.cpp:13:9: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] in>>k>>s+1; ^ user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i-1].size();j++) ^ user.cpp:12:10: warning: unused variable ‘i’ [-Wunused-variable] { int k,i,j,x,b,c,mask,lmax=-1,a=-1,act,sir; ^ user.cpp:12:12: warning: unused variable ‘j’ [-Wunused-variable] { int k,i,j,x,b,c,mask,lmax=-1,a=-1,act,sir; ^ user.cpp:12:14: warning: unused variable ‘x’ [-Wunused-variable] { int k,i,j,x,b,c,mask,lmax=-1,a=-1,act,sir; ^ user.cpp:12:16: warning: unused variable ‘b’ [-Wunused-variable] { int k,i,j,x,b,c,mask,lmax=-1,a=-1,act,sir; ^ user.cpp:12:18: warning: unused variable ‘c’ [-Wunused-variable] { int k,i,j,x,b,c,mask,lmax=-1,a=-1,act,sir; ^ user.cpp:12:42: warning: unused variable ‘sir’ [-Wunused-variable] { int k,i,j,x,b,c,mask,lmax=-1,a=-1,act,sir; ^ user.cpp:18:14: warning: ‘act’ may be used uninitialized in this function [-Wmaybe-uninitialized] act=((act<<1)+s[i]-'0')&mask; ^