Compilare: main.cpp: In function 'int main()': main.cpp:54:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("retea2.in", "r", stdin); ^ main.cpp:55:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("retea2.out", "w", stdout); ^ main.cpp:105:13: warning: 'ok' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ok==0) ^~ main.cpp:106:25: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] v[k].c+=n; ^