Compilare: user.cpp: In function ‘int BF()’: user.cpp:168:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= sizeof(viz); i ++) ^ user.cpp:150:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:177:32: note: in expansion of macro ‘sz’ for (j = 0; j < G[nod].sz; j++) ^ user.cpp: In function ‘int main()’: user.cpp:150:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:208:30: note: in expansion of macro ‘sz’ for (i = 0; i < G[N].sz; i++) ^ user.cpp:192:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in", "r", stdin); ^ user.cpp:193:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out", "w", stdout); ^ user.cpp:197:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &N, &M); ^ user.cpp:201:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d ", &x, &y, &z); ^ user.cpp: In function ‘int BF()’: user.cpp:169:19: warning: iteration 1023u invokes undefined behavior [-Waggressive-loop-optimizations] viz[i] = 0; ^ user.cpp:168:5: note: containing loop for(int i = 1; i <= sizeof(viz); i ++) ^