Compilare: main.cpp: In function 'int main()': main.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<c.size();i++){ ~^~~~~~~~~ main.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r<c.size() && c[r]==c[r-l]){ ~^~~~~~~~~ main.cpp:29:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r<c.size() && c[r-l]==c[r]){ ~^~~~~~~~~ main.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<c.size();i++){ ~^~~~~~~~~ main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r<c.size() && d[r]==d[r-l]){ ~^~~~~~~~~ main.cpp:53:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r<c.size() && d[r-l]==d[r]){ ~^~~~~~~~~ main.cpp:62:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=n;i<c.size()-n+1;i++){ ~^~~~~~~~~~~~~ main.cpp:61:21: warning: unused variable 'm' [-Wunused-variable] int n=b.size(), m=c.size(); ^