Compilare: user.cpp: In function ‘bool BFS()’: user.cpp:32:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[node].size();i++) ^ user.cpp: In function ‘bool Check(int)’: user.cpp:68:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[sink].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:99:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<solution.size();i++) ^ user.cpp:86:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tournament.in","r",stdin); ^ user.cpp:87:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tournament.out","w",stdout); ^ user.cpp:89:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:91:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&wins[i]); ^ user.cpp:94:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&matches[i][j]); ^