Compilare: user.cpp: In function ‘int main()’: user.cpp:111:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j ,k; ^ user.cpp:111:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j ,k; ^ user.cpp:108:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("immortal.in", "r", stdin); ^ user.cpp:109:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("immortal.out", "w", stdout); ^ user.cpp:110:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &I); ^ user.cpp:113:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a[i].i, &a[i].j); ^