Compilare: user.cpp: In function ‘int main()’: user.cpp:92:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < cycle.size(); ++ i) { ^ user.cpp:62:18: warning: unused variable ‘m’ [-Wunused-variable] int node, n, m, i, j, x, y; ^ user.cpp:62:24: warning: unused variable ‘j’ [-Wunused-variable] int node, n, m, i, j, x, y; ^ user.cpp:60:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mvc.in", "r", stdin); ^ user.cpp:61:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mvc.out", "w", stdout); ^ user.cpp:65:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:67:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cost[i]); ^ user.cpp:69:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^