Compilare: user.cpp: In function ‘void rebulk()’: user.cpp:32:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < work.size(); i++) { ^ user.cpp: In function ‘void swap_content(int, int)’: user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < work.size(); i++) { ^ user.cpp: In function ‘int get_element(int)’: user.cpp:126:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < work.size(); i++) { ^ user.cpp:140:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:144:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.in", "r", stdin); ^ user.cpp:145:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.out", "w", stdout); ^ user.cpp:147:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:155:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^ user.cpp: In function ‘void swap_content(int, int)’: user.cpp:109:40: warning: ‘howY’ may be used uninitialized in this function [-Wmaybe-uninitialized] work[whY + 1] = mp(from + howY * ind, to); ^ user.cpp:101:46: warning: ‘howX’ may be used uninitialized in this function [-Wmaybe-uninitialized] work[whX - 1] = mp(from, from + howX * ind - 2 * ind); ^ user.cpp:83:10: warning: ‘whX’ may be used uninitialized in this function [-Wmaybe-uninitialized] whX++; ^ user.cpp:82:10: warning: ‘whY’ may be used uninitialized in this function [-Wmaybe-uninitialized] whY++; ^