Compilare: user.cpp: In function ‘int main()’: user.cpp:180:28: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘std::vector<std::pair<int, int> >::size_type {aka long unsigned int}’ [-Wformat=] printf("%d\n", e.size()); ^ user.cpp:151:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sabotaj.in", "r", stdin); ^ user.cpp:152:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sabotaj.out", "w", stdout); ^ user.cpp:156:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:160:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^