Compilare: main.cpp: In function 'int main()': main.cpp:67:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortnet.in", "r", stdin); ^ main.cpp:68:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortnet.out","w",stdout); ^ main.cpp:69:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &nwires, &depth); ^ main.cpp:72:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf(" <%d ,%d >", &gates[i][j].lo, &gates[i][j].hi); ^