Compilare: user.cpp: In function ‘void manacher(const string&, int*)’: user.cpp:20:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(R = 0, i = 1; i < S.size(); i++) { ^ user.cpp:22:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; S[i - j] == S[i + j] && i + j < S.size() && j <= i; j++); ^ user.cpp:32:75: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = R - i + 1; S[i - j] == S[i + j] && i + j < S.size() && j <= i; j++); ^ user.cpp: In function ‘int main()’: user.cpp:47:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(A = '*', i = 0; i < BUFF.size(); i++) { ^ user.cpp:52:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(B = '*', i = 0; i < BUFF.size(); i++) { ^ user.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < A.size() - 1; i++) { ^ user.cpp:78:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < B.size(); i++) { ^ user.cpp:108:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < A.size(); i++) { ^ user.cpp:112:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < B.size(); i++) { ^ user.cpp: In function ‘void manacher(const string&, int*)’: user.cpp:28:20: warning: ‘C’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(D[2 * C - i] + i < R) { ^