Compilare: main.cpp: In function 'bool substring(int, int)': main.cpp:14:16: warning: statement has no effect [-Wunused-value] verificare; ^ main.cpp:16:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<=strlen(S[y])-strlen(S[x]) ;i++) ~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void rezolvare1()': main.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(S[i])>maxx) ~~~~~~~~~~~~^~~~~ main.cpp:40:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(S[i])==maxx) ~~~~~~~~~~~~^~~~~~ main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<strlen(S[i]); j++) ~^~~~~~~~~~~~~