Compilare: user.cpp: In function ‘void build(int, int, int)’: user.cpp:40:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptr1 < AINT[2 * nod].val.size() || ptr2 < AINT[2 * nod + 1].val.size()) { ^ user.cpp:40:81: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptr1 < AINT[2 * nod].val.size() || ptr2 < AINT[2 * nod + 1].val.size()) { ^ user.cpp:41:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ptr1 == AINT[2 * nod].val.size()) ^ user.cpp:43:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (ptr2 == AINT[2 * nod + 1].val.size()) ^ user.cpp: In function ‘int main()’: user.cpp:125:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.in", "r", stdin); ^ user.cpp:126:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.out", "w", stdout); ^ user.cpp:129:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &q); ^ user.cpp:131:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x[i]); ^ user.cpp:143:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &op); ^ user.cpp:146:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &pos); ^ user.cpp:152:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &p, &q, &k); ^ user.cpp: In function ‘void update(int, int, int, int, int)’: user.cpp:75:28: warning: ‘where’ may be used uninitialized in this function [-Wmaybe-uninitialized] where += lsb(where); ^ user.cpp: In function ‘int main()’: user.cpp:168:40: warning: ‘res’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n", sortedx[res]); ^