Compilare: user.cpp: In function ‘void buildPairs()’: user.cpp:61:17: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a; ^ user.cpp:64:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp:66:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp:68:17: warning: unused variable ‘neighb’ [-Wunused-variable] int neighb = G[i][j].first, c = G[i][j].second; ^ user.cpp:71:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp: In function ‘int Cycle(int, int, int)’: user.cpp:115:13: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a; ^ user.cpp: In function ‘void Solve()’: user.cpp:197:17: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a; ^ user.cpp:182:29: warning: variable ‘second’ set but not used [-Wunused-but-set-variable] int last = 1,last2 = 0, second; ^ user.cpp: In function ‘void Read()’: user.cpp:32:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:36:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^ user.cpp: In function ‘int main()’: user.cpp:211:35: 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:212:37: 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:213:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^