Compilare: main.cpp: In function 'void expand(int)': main.cpp:15:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vec[k].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:28:15: warning: unused variable 'k' [-Wunused-variable] int i, j, k; ^ main.cpp:29:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("catun.in", "r", stdin); ^ main.cpp:30:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("catun.out", "w", stdout); ^ main.cpp:31:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &nr); ^ main.cpp:35:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", cd + i), cd[i]--, c[cd[i]]=0; ^ main.cpp:38:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &dist); ^