Compilare: main.cpp: In function 'int main()': main.cpp:64:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("croco.in", "r", stdin); ^ main.cpp:65:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("croco.out", "w", stdout); ^ main.cpp:67:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:70:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &mf.cap[i][j]); ^ main.cpp: In member function 'void MaxFlow::resetFlow()': main.cpp:58:56: warning: iteration 119 invokes undefined behavior [-Waggressive-loop-optimizations] for (int j = 1; j <= VMAX; ++j) flow[i][j] = 0; ~~~~~~~~~~~^~~ main.cpp:58:31: note: within this loop for (int j = 1; j <= VMAX; ++j) flow[i][j] = 0; ~~^~~~~~~