Compilare: user.cpp: In function ‘int bellman(int)’: user.cpp:44:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<lista[i].size(); j++){ ^ user.cpp:31:9: warning: unused variable ‘gata’ [-Wunused-variable] int i, gata, iter=0, j, y, w; ^ user.cpp:31:15: warning: unused variable ‘iter’ [-Wunused-variable] int i, gata, iter=0, j, y, w; ^ user.cpp: In function ‘int main()’: user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in", "r", stdin); ^ user.cpp:16:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.out", "w", stdout); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:19:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &w); ^