Compilare: main.cpp: In function 'int main()': main.cpp:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s.size();++i){ ~^~~~~~~~~ main.cpp:38:19: warning: assuming signed overflow does not occur when assuming that (X + c) < X is always false [-Wstrict-overflow] for(int j=i;j>0&&j+20>i;--j){ ~~~^~~~~~~~