Compilare: main.cpp: In function 'void build(Nod*)': main.cpp:46:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(s[ind]==')') ^~ main.cpp:48:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' return; ^~~~~~ main.cpp: In function 'int main()': main.cpp:82:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("imagine.in", "r", stdin); ^ main.cpp:83:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("imagine.out", "w", stdout); ^ main.cpp:85:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ main.cpp:89:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^