Compilare: user.cpp: In function ‘int main()’: user.cpp:168:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < sorted[u].size(); i++) { ^ user.cpp:100:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d", &N, &M, &K); ^ user.cpp:102:64: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d %d", &u, &start, &v, &finish, &cost); ^ user.cpp:183:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avioane2.out", "w", stdout); ^ user.cpp:185:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &u, &time); ^