Compilare: main.cpp: In function 'int main()': main.cpp:176:40: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'int64_t {aka long long int}' [-Wformat=] printf("%ld\n", graph.mincost_maxflow); ^ main.cpp:162:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in", "r", stdin); ^ main.cpp:163:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out", "w", stdout); ^ main.cpp:166:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &N, &M, &S, &D); ^ main.cpp:170:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &u, &v, &f, &c); ^