Compilare: user.cpp: In function ‘void df1(int)’: user.cpp:18:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < g[0][x].size() ; ++j) ^ user.cpp: In function ‘void df2(int)’: user.cpp:35:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < g[1][x].size() ; ++j) ^ user.cpp: In function ‘int main()’: user.cpp:73:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < g[0][i].size() ; ++j) ^ user.cpp:92:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < ag[0][x].size() ; ++j) ^ user.cpp:111:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < ag[1][x].size() ; ++j) ^ user.cpp:124:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < ctc[i].size() ; ++j) ^ user.cpp:131:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < answer.size() ; ++i) ^ user.cpp:44:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri5.in" , "r" , stdin); ^ user.cpp:45:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri5.out" , "w" , stdout); ^ user.cpp:47:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^ user.cpp:48:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &m); ^ user.cpp:52:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &x); ^ user.cpp:53:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &y); ^