Compilare: main.cpp: In function 'int main()': main.cpp:37:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0,st=0,dr=-1;i<s.length();i++){ ~^~~~~~~~~~~ main.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(0 <= i-k && i+k<s.length() && s[i-k] == s[i+k]) ~~~^~~~~~~~~~~ main.cpp:48:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0,st=0,dr=-1;i<s.length();i++){ ~^~~~~~~~~~~ main.cpp:50:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(0 <= i-k-1 && i+k<s.length() && s[i-k-1] == s[i+k]) ~~~^~~~~~~~~~~ main.cpp:33:9: warning: unused variable 't' [-Wunused-variable] int t,i,j; ^ main.cpp:33:13: warning: unused variable 'j' [-Wunused-variable] int t,i,j; ^