Compilare: user.cpp: In function ‘void solve()’: user.cpp:68:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < graph [i].size (); ++ j) { ^ user.cpp:74:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < graph [i].size (); ++ j) ^ user.cpp:89:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < graph [i].size (); ++ j) { ^ user.cpp:111:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < graph [i].size () - 1; j ++) { ^ user.cpp:60:18: warning: unused variable ‘ok’ [-Wunused-variable] int i, a, b, ok, edge, flag =0, aux, fx, fy, j, med, aa, bb; ^ user.cpp:60:22: warning: unused variable ‘edge’ [-Wunused-variable] int i, a, b, ok, edge, flag =0, aux, fx, fy, j, med, aa, bb; ^ user.cpp: In function ‘void read()’: user.cpp:30:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m); ^ user.cpp:32:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d", &a, &b, &c); ^ user.cpp: In function ‘int main()’: user.cpp:157:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ulei.in", "r", stdin); ^ user.cpp:158:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ulei.out", "w", stdout); ^ user.cpp:160:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^