Compilare: main.cpp: In function 'void get_cbc(int, int)': main.cpp:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nmuchii != cbc[ncbc].size() * (cbc[ncbc].size() - 1) / 2) ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int, int)': main.cpp:61:9: warning: variable 'cx' set but not used [-Wunused-but-set-variable] int cx; ^~ main.cpp: In function 'int main()': main.cpp:75:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linegraph.in", "r", stdin); ^ main.cpp:76:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linegraph.out", "w", stdout); ^ main.cpp:78:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:81:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ main.cpp:98:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^