Compilare: user.cpp: In function ‘int main()’: user.cpp:85:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] edge[i].cos += p5 * cost[ch[j]]; ^ user.cpp: In function ‘int fin(int)’: user.cpp:52:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:61:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ninjago.in", "r", stdin); ^ user.cpp:62:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ninjago.out", "w", stdout); ^ user.cpp:65:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &var, &n, &m); ^ user.cpp:78:76: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %c %c %c %c", &x, &y, &ch[1], &ch[2], &ch[3], &ch[4]); ^