Compilare: user.cpp: In function ‘void push(int)’: user.cpp:44:10: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ok = 0; ^ user.cpp: In function ‘int getMaxFlow(int, int)’: user.cpp:90:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, nod = nodes[i]; i < nodes.size(); i++, nod = nodes[i]) ^ user.cpp: In function ‘int main()’: user.cpp:110:38: 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:111:40: 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:114:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:119:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &cap); ^