foo.cc:22:39: warning: bad option '-fwhole-program' to pragma 'optimize' [-Wpragmas]
   22 | #pragma GCC optimize("-fwhole-program")
      |                                       ^
foo.cc:29:41: warning: bad option '-fstrict-overflow' to pragma 'optimize' [-Wpragmas]
   29 | #pragma GCC optimize("-fstrict-overflow")
      |                                         ^
foo.cc:31:41: warning: bad option '-fcse-skip-blocks' to pragma 'optimize' [-Wpragmas]
   31 | #pragma GCC optimize("-fcse-skip-blocks")
      |                                         ^
foo.cc:45:51: warning: bad option '-funsafe-loop-optimizations' to pragma 'optimize' [-Wpragmas]
   45 | #pragma GCC optimize("-funsafe-loop-optimizations")
      |                                                   ^
foo.cc:56:17: warning: bad option '-fwhole-program' to attribute 'optimize' [-Wattributes]
   56 | inline int read() {
      |                 ^
foo.cc:56:17: warning: bad option '-fstrict-overflow' to attribute 'optimize' [-Wattributes]
foo.cc:56:17: warning: bad option '-fcse-skip-blocks' to attribute 'optimize' [-Wattributes]
foo.cc:56:17: warning: bad option '-funsafe-loop-optimizations' to attribute 'optimize' [-Wattributes]
foo.cc:65:29: warning: bad option '-fwhole-program' to attribute 'optimize' [-Wattributes]
   65 | inline void add(int u, int e) { nxt[e] = head[u]; head[u] = e; }
      |                             ^
foo.cc:65:29: warning: bad option '-fstrict-overflow' to attribute 'optimize' [-Wattributes]
foo.cc:65:29: warning: bad option '-fcse-skip-blocks' to attribute 'optimize' [-Wattributes]
foo.cc:65:29: warning: bad option '-funsafe-loop-optimizations' to attribute 'optimize' [-Wattributes]
foo.cc:67:30: warning: bad option '-fwhole-program' to attribute 'optimize' [-Wattributes]
   67 | inline int index(int i, int j) { return (i - 1) * (k + 1) + j; }
      |                              ^
foo.cc:67:30: warning: bad option '-fstrict-overflow' to attribute 'optimize' [-Wattributes]
foo.cc:67:30: warning: bad option '-fcse-skip-blocks' to attribute 'optimize' [-Wattributes]
foo.cc:67:30: warning: bad option '-funsafe-loop-optimizations' to attribute 'optimize' [-Wattributes]
foo.cc:69:37: warning: bad option '-fwhole-program' to attribute 'optimize' [-Wattributes]
   69 | inline void bag(int *f, int A, int V) {
      |                                     ^
foo.cc:69:37: warning: bad option '-fstrict-overflow' to attribute 'optimize' [-Wattributes]
foo.cc:69:37: warning: bad option '-fcse-skip-blocks' to attribute 'optimize' [-Wattributes]
foo.cc:69:37: warning: bad option '-funsafe-loop-optimizations' to attribute 'optimize' [-Wattributes]
foo.cc:82:16: warning: bad option '-fwhole-program' to attribute 'optimize' [-Wattributes]
   82 | void dfsL(int x) {
      |                ^
foo.cc:82:16: warning: bad option '-fstrict-overflow' to attribute 'optimize' [-Wattributes]
foo.cc:82:16: warning: bad option '-fcse-skip-blocks' to attribute 'optimize' [-Wattributes]
foo.cc:82:16: warning: bad option '-funsafe-loop-optimizations' to attribute 'optimize' [-Wattributes]
foo.cc:91:25: warning: bad option '-fwhole-program' to attribute 'optimize' [-Wattributes]
   91 | void dfsR(int x, int sum) {
      |                         ^
foo.cc:91:25: warning: bad option '-fstrict-overflow' to attribute 'optimize' [-Wattributes]
foo.cc:91:25: warning: bad option '-fcse-skip-blocks' to attribute 'optimize' [-Wattributes]
foo.cc:91:25: warning: bad option '-funsafe-loop-optimizations' to attribute 'optimize' [-Wattributes]
foo.cc:105:10: warning: bad option '-fwhole-program' to attribute 'optimize' [-Wattributes]
  105 | int main() {
      |          ^
foo.cc:105:10: warning: bad option '-fstrict-overflow' to attribute 'optimize' [-Wattributes]
foo.cc:105:10: warning: bad option '-fcse-skip-blocks' to attribute 'optimize' [-Wattributes]
foo.cc:105:10: warning: bad option '-funsafe-loop-optimizations' to attribute 'optimize' [-Wattributes]

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