Compilare: user.cpp: In function ‘void Solve()’: user.cpp:109:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vec.size(); i++) ^ user.cpp:115:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vec.size(); i++) ^ user.cpp: In function ‘void Read()’: user.cpp:129:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &variant); ^ user.cpp:130:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &m, &n); ^ user.cpp:135:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &mat[i][j]); ^ user.cpp:137:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp: In function ‘int main()’: user.cpp:143:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ferma3.in", "r", stdin); ^ user.cpp:144:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ferma3.out", "w", stdout); ^