Compilare: user.cpp: In function ‘void Prefix_A()’: user.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < A.size(); i++) ^ user.cpp: In function ‘void Prefix_B()’: user.cpp:30:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < B.size(); i++) ^ user.cpp: In function ‘void Solve_A()’: user.cpp:44:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < S.size(); i++) ^ user.cpp:50:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == A.size()) ^ user.cpp: In function ‘void Solve_B()’: user.cpp:62:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < S.size(); i++) ^ user.cpp:68:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == B.size()) ^ user.cpp: In function ‘int Serious_Solve()’: user.cpp:79:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j = 0; i < VA.size() && j < VB.size(); i++) ^ user.cpp:79:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j = 0; i < VA.size() && j < VB.size(); i++) ^ user.cpp:81:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (VA[i] >= VB[j] && j < VB.size()) j++; ^