Compilare: user.cpp: In function ‘int main()’: user.cpp:21:38: warning: unused variable ‘cost_minim’ [-Wunused-variable] int g, w, i, energie_maxima = 0, cost_minim = 0, energie_minima = 0; ^ user.cpp:21:54: warning: unused variable ‘energie_minima’ [-Wunused-variable] int g, w, i, energie_maxima = 0, cost_minim = 0, energie_minima = 0; ^ user.cpp:18:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("energii.in", "r", stdin); ^ user.cpp:19:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("energii.out", "w", stdout); ^ user.cpp:22:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &g, &w); ^ user.cpp:27:73: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &generatoare[i].energie, &generatoare[i].cost); ^