Compilare: main.cpp: In function 'void solve(int)': main.cpp:78:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 1) freopen ("grader_test1.in", "r", stdin); ^ main.cpp:79:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 2) freopen ("grader_test2.in", "r", stdin); ^ main.cpp:80:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 3) freopen ("grader_test3.in", "r", stdin); ^ main.cpp:81:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 4) freopen ("grader_test4.in", "r", stdin); ^ main.cpp:82:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 5) freopen ("grader_test5.in", "r", stdin); ^ main.cpp:83:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 6) freopen ("grader_test6.in", "r", stdin); ^ main.cpp:84:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 7) freopen ("grader_test7.in", "r", stdin); ^ main.cpp:85:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 8) freopen ("grader_test8.in", "r", stdin); ^ main.cpp:86:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 9) freopen ("grader_test9.in", "r", stdin); ^ main.cpp:87:57: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (id == 10) freopen ("grader_test10.in", "r", stdin); ^