Compilare: user.cpp: In function ‘void SolveFirstPass()’: user.cpp:100:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < oldS.length(); i++) { ^ user.cpp:101:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < oldS.length(); j++) { ^ user.cpp:102:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; j - k >= 0 && i + k < oldS.length() && oldS[i + k] == oldS[j - k]; k++) { ^ user.cpp: In function ‘void Manacher()’: user.cpp:136:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= 2 * oldS.size(); i++) { ^ user.cpp:144:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < modS.length(); i++) { ^ user.cpp:147:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(modS[i - j] == modS[i + j] && i + j < modS.length()) j++; ^ user.cpp:157:69: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(modS[i - k] == modS[i + k] && i + k < modS.length()) k++; ^ user.cpp: In function ‘void SolveSecondPass()’: user.cpp:173:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < modS.length(); i++) { ^