Compilare: main.cpp: In function 'int join(int, int)': main.cpp:87:33: warning: operation on 'tata2' may be undefined [-Wsequence-point] tata1 = tata1 ^ tata2 ^(tata2 = tata1); ~~~~~~~^~~~~~~~ main.cpp: In function 'int main()': main.cpp:105:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rusoaica.in", "r", stdin); ^ main.cpp:107:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rusoaica.out", "w", stdout); ^ main.cpp:111:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &A); ^ main.cpp:119:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &muc[i].a, &muc[i].b, &muc[i].c); ^