Compilare: user.cpp: In function ‘void gaus(int)’: user.cpp:100:15: warning: statement has no effect [-Wunused-value] for (x; x < nq && eq(a[x][i], 0); x++); ^ user.cpp: In function ‘void solve()’: user.cpp:165:9: warning: unused variable ‘k’ [-Wunused-variable] int k = 0; ^ user.cpp: In function ‘void read()’: user.cpp:33:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:35:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %lf %lf", &x, &t.y, &t.p0, &t.p1); ^ user.cpp: In function ‘int main()’: user.cpp:185:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.in", "r", stdin); ^ user.cpp:186:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.out", "w", stdout); ^