Compilare: user.cpp: In function ‘int main()’: user.cpp:65:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.in", "r", stdin); ^ user.cpp:66:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.out", "w", stdout); ^ user.cpp:69:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:72:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v[i].x, &v[i].y); ^ user.cpp:61:14: warning: ‘ind3’ may be used uninitialized in this function [-Wmaybe-uninitialized] return i + 1; ^ user.cpp:90:19: note: ‘ind3’ was declared here int ind1, ind2, ind3; ^ user.cpp:61:14: warning: ‘ind2’ may be used uninitialized in this function [-Wmaybe-uninitialized] return i + 1; ^ user.cpp:90:13: note: ‘ind2’ was declared here int ind1, ind2, ind3; ^ user.cpp:61:14: warning: ‘ind1’ may be used uninitialized in this function [-Wmaybe-uninitialized] return i + 1; ^ user.cpp:90:7: note: ‘ind1’ was declared here int ind1, ind2, ind3; ^