Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ^ user.cpp: In function ‘void dfs_cuplaj(int)’: user.cpp:73:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ^ user.cpp: In function ‘bool pairUp(int)’: user.cpp:84:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<cuplaj[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:120:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<ans[i].size(); j++) ^ user.cpp:124:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size(); j++) ^ user.cpp:148:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<List.size(); j++) ^ user.cpp:99:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.in", "r", stdin); ^ user.cpp:100:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.out", "w", stdout); ^ user.cpp:102:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:106:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:167:45: warning: ‘japca’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n", ans[c-1][0], ans[japca-1][0]); ^