Compilare: main.cpp: In function 'int main()': main.cpp:20:15: warning: unused variable 'j' [-Wunused-variable] int n, i, j, x, cnt0 = 0; ^ main.cpp:17:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "calorifer.in", "r", stdin ); ^ main.cpp:18:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "calorifer.out", "w", stdout ); ^ main.cpp:22:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &n ); ^ main.cpp:24:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &x ); ^