Compilare: main.cpp: In function 'void solve1()': main.cpp:11:7: warning: unused variable 'a' [-Wunused-variable] int a, b ; ^ main.cpp:11:10: warning: unused variable 'b' [-Wunused-variable] int a, b ; ^ main.cpp: In function 'void solve2()': main.cpp:31:7: warning: unused variable 'a' [-Wunused-variable] int a, b ; ^ main.cpp:31:10: warning: unused variable 'b' [-Wunused-variable] int a, b ; ^ main.cpp: In function 'int main()': main.cpp:49:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("diagonala.in", "r", stdin) ; ^ main.cpp:50:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("diagonala.out", "w", stdout) ; ^ main.cpp:52:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n) ; ^ main.cpp:54:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &now[i].first, &now[i].second) ; ^