Compilare: user.cpp: In function ‘int main()’: user.cpp:15:59: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(strlen(m[i])>strlen(s)||strlen(m[i])==strlen(s)&&strcmp(m[i],s)<0) strcpy(s,m[i]); ^ user.cpp:28:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<strlen(m[j]);k++) ^ user.cpp:29:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(m[j][k]==m[i][in]&&in<strlen(m[i])) in++; ^ user.cpp:30:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(in==strlen(m[i])) ok=0; ^