Compilare: user.cpp: In function ‘int main()’: user.cpp:113:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < list[i].size(); j++) { ^ user.cpp:127:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < not_fixed.size(); i++) { ^ user.cpp:88:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bcolor.in","r",stdin); ^ user.cpp:89:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bcolor.out","w",stdout); ^ user.cpp:91:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &cnt); ^ user.cpp:96:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^