Compilare: user.cpp: In function ‘void update(int, int, int, int&)’: user.cpp:113:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j = 0; i < aint[ind<<1].size() || j < aint[(ind<<1)+1].size(); ) { ^ user.cpp:113:81: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j = 0; i < aint[ind<<1].size() || j < aint[(ind<<1)+1].size(); ) { ^ user.cpp:114:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= aint[ind<<1].size()) ^ user.cpp:116:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (j < aint[(ind<<1)+1].size() && aint[(ind<<1)+1][j] < aint[ind<<1][i]) ^ user.cpp: In function ‘char getChar()’: user.cpp:25:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, DIM, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:154:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoo.in", "r", stdin); ^ user.cpp:155:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoo.out", "w", stdout); ^ user.cpp:157:27: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, DIM, stdin); ^