Compilare: user.cpp: In member function ‘void EDGE::read()’: user.cpp:13:38: warning: format ‘%d’ expects argument of type ‘int*’, but argument 4 has type ‘char*’ [-Wformat=] scanf("%d%d%d", &x, &y, &cost); ^ user.cpp: In function ‘int main()’: user.cpp:75:15: warning: unused variable ‘sol’ [-Wunused-variable] int i, m, sol, k; ^ user.cpp:73:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("online.in", "r", stdin); ^ user.cpp:74:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("online.out", "w", stdout); ^ user.cpp:78:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:82:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &k); ^ user.cpp: In member function ‘void EDGE::read()’: user.cpp:13:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &cost); ^