Compilare: user.cpp: In function ‘void solve()’: user.cpp:87:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < work.size(); i++) { ^ user.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < work[i].t2.size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:124:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < aux1.size(); i = j) { ^ user.cpp:125:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = i; j < aux1.size(); j++) { ^ user.cpp:96:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permbit.in","r",stdin); ^ user.cpp:97:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permbit.out","w",stdout); ^ user.cpp:99:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n", &tp, &n, &m); ^ user.cpp:102:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s); ^